1. Introduction
In the context of global energy conservation and carbon reduction, and the continuous upgrading of industrial equipment, heat exchange systems, as key components of energy conversion and utilization, are facing higher requirements for efficiency, compactness, and energy saving. Traditional smooth tube heat transfer elements have the disadvantages of small heat transfer area, low convective heat transfer coefficient, and large space occupation, which are difficult to meet the heat exchange needs of high-power, miniaturized, and high-efficiency equipment in modern industry.
Gilled tubes, as an improved high-efficiency heat transfer element, realize the expansion of heat transfer area by adding fins on the surface of the base tube, while optimizing the flow field of the heat exchange medium, thereby significantly improving the overall heat transfer efficiency of the heat exchanger. Compared with traditional smooth tubes, under the same heat transfer load, gilled tubes can reduce the volume of the heat exchanger by 30% to 60%, reduce the consumption of metal materials, and save energy consumption by 15% to 25%, which has significant economic and environmental benefits.
The development of gilled tube technology is closely related to the progress of manufacturing processes and material science. From the early manual embedding fins to the modern automatic rolling, welding, and extrusion processes, the manufacturing precision, structural stability, and heat transfer performance of gilled tubes have been significantly improved. Today, gilled tubes have become indispensable core components in heat exchange systems such as industrial boilers, air conditioners, refrigerators, waste heat recovery equipment, and aerospace thermal control systems, covering thermal power generation, metallurgy, petrochemical, refrigeration and air conditioning, and other industries.
However, in the production and application of gilled tubes, there are still problems such as poor fin-base tube bonding strength, uneven fin distribution, corrosion of fin surfaces, and fouling, which affect the heat transfer efficiency and service life of gilled tubes. To give full play to the advantages of gilled tubes in high-efficiency heat transfer, it is necessary to deeply understand their manufacturing processes, clarify their application characteristics, and master the key technologies of production quality control and operation and maintenance. This paper focuses on the core of gilled tubes, systematically elaborates on their manufacturing processes, application advantages, application cases, and optimization measures, aiming to provide professional technical support for the efficient and stable operation of heat exchange systems.
2. Classification and Basic Structure of Gilled Tubes
Gilled tubes can be classified into different types according to their fin structure, manufacturing process, and application scenarios, and their basic structures are closely related to their heat transfer performance and application fields. A clear understanding of the classification and structure of gilled tubes is the basis for grasping their manufacturing processes and application advantages.
2.1 Classification of Gilled Tubes
Gilled tubes are mainly classified according to fin structure, manufacturing process, and material, and each type has distinct characteristics and applicable fields:
- Classification by Fin Structure: According to the arrangement form and shape of fins, gilled tubes are divided into spiral gilled tubes, longitudinal gilled tubes, and annular gilled tubes. Spiral gilled tubes have fins arranged in a spiral shape on the base tube, which can enhance the turbulence of the heat exchange medium, reduce fouling, and are widely used in boiler economizers, air preheaters, and waste heat recovery equipment. Longitudinal gilled tubes have fins arranged parallel to the axis of the base tube, which have low flow resistance and are suitable for scenarios with high medium flow rate, such as aerospace engine cooling and large-scale industrial heat exchangers. Annular gilled tubes have fins arranged in a circular ring shape perpendicular to the axis of the base tube, which are easy to manufacture and are suitable for small and medium-sized heat exchangers.
- Classification by Manufacturing Process: According to the manufacturing method of fins and base tube combination, gilled tubes are divided into embedded gilled tubes, welded gilled tubes, rolled gilled tubes, and extruded gilled tubes. Embedded gilled tubes are made by embedding fins into the grooves of the base tube, with high bonding strength and good heat transfer performance, suitable for high-temperature and high-pressure scenarios. Welded gilled tubes are made by welding fins to the surface of the base tube, with simple manufacturing process and low cost, suitable for medium and low temperature scenarios. Rolled gilled tubes are made by rolling fins on the surface of the base tube through a rolling process, with compact structure and high production efficiency, which is the most widely used type currently. Extruded gilled tubes are made by extruding the base tube material to form fins, with good integrity and corrosion resistance, suitable for corrosion-prone environments.
- Classification by Material: According to the material of the base tube and fins, gilled tubes are divided into carbon steel gilled tubes, alloy steel gilled tubes, copper gilled tubes, aluminum gilled tubes, and stainless steel gilled tubes. Carbon steel gilled tubes are low-cost and suitable for ordinary industrial scenarios with low corrosion requirements. Alloy steel gilled tubes have high temperature resistance and pressure-bearing capacity, suitable for high-temperature and high-pressure heat exchange systems such as boilers. Copper and aluminum gilled tubes have high thermal conductivity, suitable for refrigeration and air conditioning systems with high heat transfer efficiency requirements. Stainless steel gilled tubes have excellent corrosion resistance, suitable for corrosive medium scenarios such as petrochemical and marine equipment.
2.2 Basic Structure of Gilled Tubes
The basic structure of a typical gilled tube consists of two core components: a base tube and fins (gills), and the rationality of the structure directly affects the heat transfer performance and structural stability of the gilled tube:
- Base Tube: The core bearing component of the gilled tube, responsible for supporting the fins and conveying the internal heat exchange medium. The base tube is usually made of seamless steel pipe, copper pipe, aluminum pipe, or stainless steel pipe, with a diameter of 10mm to 100mm and a wall thickness of 1mm to 10mm, depending on the operating pressure, temperature, and medium characteristics. The surface of the base tube is usually processed with grooves, convex ribs, or rough surfaces to enhance the bonding strength between the base tube and fins and improve the heat transfer efficiency between them.
- Fins (Gills): The key component for expanding the heat transfer area, attached to the outer surface (or inner surface) of the base tube. The fins are usually made of materials with high thermal conductivity, such as copper, aluminum, carbon steel, and alloy steel, with a thickness of 0.1mm to 2mm, a height of 5mm to 50mm, and a pitch of 2mm to 20mm. The fin shape can be rectangular, triangular, serrated, or corrugated—serrated and corrugated fins can enhance the turbulence of the medium, further improving the convective heat transfer coefficient. For embedded and rolled gilled tubes, the fins are closely combined with the base tube to ensure efficient heat transfer; for welded gilled tubes, the welding seam between the fins and the base tube must be tight to avoid heat transfer resistance caused by gaps.
- Accessories: In practical applications, gilled tubes are usually equipped with additional structures to improve performance, such as anti-corrosion coatings (to enhance corrosion resistance), anti-fouling coatings (to reduce fouling), and reinforcing rings (to improve structural stability). For gilled tubes used in high-temperature and high-pressure environments, thermal insulation layers are also added to reduce heat loss.
The overall structure of the gilled tube is designed according to the heat exchange requirements, medium characteristics, and operating conditions. For example, in boiler economizers, spiral gilled tubes with large fin height and small pitch are usually used to maximize the heat transfer area; in refrigeration systems, copper or aluminum gilled tubes with thin fins and dense arrangement are used to improve heat transfer efficiency and reduce space occupation.
3. Key Manufacturing Processes of Gilled Tubes: Principle and Quality Control
The manufacturing process of gilled tubes is the core factor affecting their heat transfer performance, structural stability, and service life. Different manufacturing processes have their own characteristics, applicable scenarios, and quality control points. This section focuses on the four most common manufacturing processes of gilled tubes: embedding, welding, rolling, and extrusion, and elaborates on their process principles, technical characteristics, and quality control requirements.
3.1 Embedding Process (Embedded Gilled Tubes)
The embedding process is a high-precision manufacturing process that embeds fins into the pre-processed grooves of the base tube, relying on the interference fit or elastic deformation between the fins and the grooves to realize tight combination. This process is suitable for high-temperature, high-pressure, and high-vibration scenarios, such as boiler superheaters and aerospace engine heat exchangers.
Process Principle: First, process axial or spiral grooves on the outer surface of the base tube (the cross-section of the groove is usually dovetail-shaped or trapezoidal to enhance the bonding force); then, process the fins into a shape matching the groove, and embed the fins into the groove through mechanical extrusion or thermal expansion. During the embedding process, the fins are elastically deformed, and the base tube groove is slightly expanded, forming a tight interference fit between the two, ensuring no gap between the fin and the base tube, and realizing efficient heat transfer.
Technical Characteristics: The embedded gilled tube has high bonding strength between the fin and the base tube, good heat transfer performance (no gap heat resistance), and strong structural stability, which can withstand high temperature, high pressure, and high vibration. However, the process is complex, the manufacturing precision is high, the production efficiency is low, and the cost is relatively high.
Quality Control Points: Strictly control the size and shape of the base tube groove (groove width, depth, and angle) to ensure that it matches the fin; control the embedding force and speed to avoid fin damage or insufficient embedding; check the bonding tightness between the fin and the base tube after embedding, and eliminate gaps or loose combinations; detect the dimensional accuracy of the gilled tube (fin height, pitch, and straightness) to meet the design requirements.
3.2 Welding Process (Welded Gilled Tubes)
The welding process is the most widely used manufacturing process for gilled tubes, which welds the fins to the surface of the base tube through various welding methods, realizing the combination of the two. This process is suitable for medium and low temperature, medium and low pressure scenarios, such as air conditioners, refrigerators, and ordinary industrial heat exchangers.
Process Principle: First, clean the surface of the base tube and fins to remove oil, rust, and oxide layers to ensure welding quality; then, place the fins on the preset position of the base tube, and use welding methods such as resistance welding, argon arc welding, laser welding, or brazing to weld the fins to the base tube. The welding process melts the contact surface between the fin and the base tube, forming a welding seam, and after cooling, the two are firmly combined.
Technical Characteristics: The welding process has simple equipment, high production efficiency, low cost, and strong adaptability to different materials and fin structures. However, the bonding strength is lower than that of embedded gilled tubes, and there may be gaps or welding defects (such as pores, cracks) at the welding seam, which will increase the heat transfer resistance and affect the heat transfer efficiency. In addition, the welding seam is prone to corrosion in corrosive environments.
Quality Control Points: Select appropriate welding methods and welding parameters (welding current, voltage, speed) according to the material of the base tube and fins; strictly control the welding seam quality, avoid pores, cracks, and incomplete fusion; check the bonding strength of the welding seam through tensile tests; perform anti-corrosion treatment on the welding seam (such as painting, galvanizing) to enhance corrosion resistance.
3.3 Rolling Process (Rolled Gilled Tubes)
The rolling process is a continuous forming process that uses rolling tools to extrude the surface of the base tube, making the base tube material flow and form fins. This process is suitable for large-scale mass production, and is widely used in boiler economizers, air preheaters, and waste heat recovery equipment.
Process Principle: The base tube is clamped by a rolling machine and rotated at a certain speed; the rolling tool (with a fin-shaped groove) is pressed against the surface of the base tube, and the base tube material is extruded and flowed into the groove of the rolling tool, forming spiral or longitudinal fins. The rolling process is continuous, and the fin height, pitch, and shape can be adjusted by changing the rolling tool and rolling parameters.
Technical Characteristics: The rolled gilled tube has compact structure, uniform fin distribution, high production efficiency, and low cost. The fin and the base tube are integrated (no welding seam or gap), so the heat transfer efficiency is high, and the structural stability is good. However, the rolling process has high requirements on the ductility of the base tube material, and it is not suitable for brittle materials; the fin height is limited (usually not more than 30mm), and it is difficult to manufacture gilled tubes with large fin height.
Quality Control Points: Control the rolling speed, pressure, and temperature to ensure the fin shape and dimensional accuracy; check the fin height, pitch, and thickness to meet the design requirements; detect the surface quality of the fins, avoid scratches, cracks, and uneven thickness; check the straightness of the gilled tube to prevent deformation during rolling.
3.4 Extrusion Process (Extruded Gilled Tubes)
The extrusion process is a forming process that uses an extruder to extrude the base tube material through a die with a fin shape, directly forming fins on the surface of the base tube. This process is suitable for materials with good ductility (such as aluminum, copper), and is widely used in refrigeration and air conditioning systems.
Process Principle: The base tube blank is heated to a certain temperature (to improve ductility), and then pushed into the extrusion die by the extruder. The die has a cavity matching the shape of the gilled tube (base tube + fins), and the base tube blank is extruded through the die, forming fins on the surface while forming the base tube. The extrusion process can realize one-time forming of the gilled tube, with high integrity.
Technical Characteristics: The extruded gilled tube has good integrity, no gaps between the fin and the base tube, high heat transfer efficiency, and excellent corrosion resistance. The fin shape can be designed flexibly, and the production process is clean and environmentally friendly. However, the extrusion process requires high equipment investment, high energy consumption, and is only suitable for small and medium-sized gilled tubes; the material is limited to ductile metals such as aluminum and copper.
Quality Control Points: Control the extrusion temperature, speed, and pressure to ensure the fin shape and dimensional accuracy; check the surface quality of the gilled tube, avoid scratches, cracks, and uneven thickness; detect the mechanical properties of the gilled tube (tensile strength, ductility) to meet the application requirements; control the straightness and roundness of the gilled tube.
4. Core Application Advantages of Gilled Tubes: Key to High-Efficiency Heat Transfer
Gilled tubes, as high-efficiency heat transfer elements, have multiple core advantages compared with traditional smooth tubes, which not only can significantly improve the heat transfer efficiency of heat exchange systems, but also can save space, reduce energy consumption, and enhance operational stability. These advantages make gilled tubes an indispensable core component in modern heat exchange systems.
4.1 Significantly Improve Heat Transfer Efficiency
Improving heat transfer efficiency is the most core advantage of gilled tubes. The heat transfer efficiency of heat exchange elements is mainly determined by the heat transfer area and the convective heat transfer coefficient. Gilled tubes expand the heat transfer area by adding fins on the surface of the base tube—compared with smooth tubes of the same length and diameter, the heat transfer area of gilled tubes can be increased by 3 to 10 times, and even higher for gilled tubes with large fin height and dense arrangement.
At the same time, the fins can enhance the turbulence of the external heat exchange medium (such as flue gas, air), reduce the thickness of the boundary layer, and improve the convective heat transfer coefficient. For example, spiral gilled tubes can make the medium flow in a spiral direction, enhance the disturbance of the medium, and further improve the heat transfer efficiency. It is estimated that under the same working conditions, the heat transfer efficiency of gilled tubes is 2 to 5 times that of smooth tubes, which can significantly reduce the heat exchange area required for the same heat transfer load.
4.2 Save Space and Reduce Material Consumption
Against the background of the miniaturization of industrial equipment, the space occupation of heat exchange systems is increasingly restricted. Gilled tubes, with their high heat transfer efficiency, can achieve the same heat transfer load with a smaller heat exchange area, thereby reducing the volume and weight of the heat exchanger. Compared with heat exchangers using smooth tubes, the volume of heat exchangers using gilled tubes can be reduced by 30% to 60%, and the weight can be reduced by 20% to 50%.
In addition, the reduction of the heat exchange area also reduces the consumption of metal materials (base tube and fins), which not only reduces the manufacturing cost of the heat exchanger, but also saves valuable metal resources. For example, a boiler economizer using spiral gilled tubes can save 30% to 40% of steel compared with a smooth tube economizer of the same heat transfer capacity, which has significant economic benefits.
4.3 Reduce Energy Consumption and Operating Costs
The high heat transfer efficiency of gilled tubes can directly reduce the energy consumption of heat exchange systems, thereby reducing operating costs. For heat exchange systems that require power to drive the medium flow (such as fans, pumps), the use of gilled tubes can reduce the flow rate of the medium under the same heat transfer load, thereby reducing the power consumption of fans and pumps.
Taking a large industrial boiler economizer as an example, replacing smooth tubes with spiral gilled tubes can reduce the flue gas flow rate by 20% to 30%, thereby reducing the power consumption of the induced draft fan by 15% to 25%. For refrigeration and air conditioning systems, the use of gilled tubes can improve the heat exchange efficiency of the condenser and evaporator, reduce the energy consumption of the compressor, and reduce the annual operating cost by 10% to 20%.
4.4 Strong Adaptability to Working Conditions
Gilled tubes have strong adaptability to different working conditions, and can be customized according to the operating temperature, pressure, medium characteristics, and heat transfer requirements. For high-temperature and high-pressure scenarios (such as boiler superheaters), embedded or rolled gilled tubes made of alloy steel can be used; for corrosive medium scenarios (such as petrochemical equipment), stainless steel or anti-corrosion coated gilled tubes can be used; for low-temperature scenarios (such as refrigeration systems), copper or aluminum gilled tubes with high thermal conductivity can be used.
In addition, gilled tubes can be designed into different fin structures (spiral, longitudinal, annular) and sizes according to the flow characteristics of the medium, optimizing the flow field and further improving the heat transfer efficiency and operational stability. For example, in scenarios with high medium flow rate, longitudinal gilled tubes with low flow resistance are used; in scenarios with easy fouling, serrated gilled tubes that are easy to clean are used.
4.5 Long Service Life and High Reliability
Gilled tubes have high structural stability and long service life, especially embedded and rolled gilled tubes—since the fin and the base tube are tightly combined (no gaps or welding seams), they are not easy to fall off or damage, and can withstand high temperature, high pressure, and high vibration. The service life of gilled tubes is usually 8 to 15 years, which is longer than that of traditional smooth tubes (5 to 10 years).
In addition, gilled tubes are easy to maintain—for fouled gilled tubes, ash cleaning devices (such as soot blowers) can be used to clean the fins, restoring heat transfer efficiency; for damaged fins, local replacement or repair can be carried out without replacing the entire gilled tube, reducing maintenance costs and downtime.
5. Practical Application Cases and Effect Analysis
To further illustrate the application effect and core advantages of gilled tubes, this section selects typical application cases in boiler systems, refrigeration equipment, and waste heat recovery, and analyzes the heat transfer effect, energy-saving benefits, and economic benefits of gilled tubes.
5.1 Case 1: Boiler Economizer Gilled Tube Application
A 300MW coal-fired thermal power plant uses a subcritical boiler, and the original economizer adopts smooth tube heat exchange elements, with a flue gas inlet temperature of 420℃, an outlet temperature of 170℃, and a heat transfer efficiency of 85%. To improve heat transfer efficiency and reduce energy consumption, the plant replaced the smooth tube economizer with spiral rolled gilled tubes (base tube material: 20G carbon steel, fin material: Q235 carbon steel, fin height: 15mm, fin pitch: 10mm).
After the transformation, the heat transfer area of the economizer is increased by 4 times, the flue gas outlet temperature is reduced to 130℃, the heat transfer efficiency is increased to 92%, and the coal consumption per unit power generation is reduced by 8g/kWh. Based on the annual power generation of 1.8×10⁹ kWh, the annual coal saving is 14,400 tons, the annual economic benefit is about 7.2 million yuan (based on 500 yuan per ton of coal), and the annual CO₂ emission reduction is about 38,880 tons, achieving significant energy-saving, emission-reduction, and economic benefits.
5.2 Case 2: Refrigeration Air Conditioning Gilled Tube Application
A large shopping mall uses a central air conditioning system, and the original condenser adopts smooth copper tubes, with a heat transfer efficiency of 80%, a condenser volume of 12m³, and an annual power consumption of 1.2×10⁶ kWh. To reduce the volume of the condenser and save energy consumption, the mall replaced the smooth copper tubes with extruded aluminum gilled tubes (base tube material: copper, fin material: aluminum, fin height: 8mm, fin pitch: 5mm).
After the replacement, the heat transfer efficiency of the condenser is increased to 90%, the volume of the condenser is reduced to 5m³ (reduced by 58.3%), and the annual power consumption of the air conditioning system is reduced to 9.6×10⁵ kWh (reduced by 20%). The annual electricity saving is 2.4×10⁵ kWh, the annual economic benefit is about 192,000 yuan (based on 0.8 yuan/kWh), and the space occupation of the air conditioning system is significantly reduced, creating more usable space for the shopping mall.
5.3 Case 3: Industrial Waste Heat Recovery Gilled Tube Application
A petrochemical enterprise has a waste heat flue gas with a temperature of 350℃ and a flow rate of 50,000 m³/h, which was directly discharged in the past, resulting in massive energy waste. The enterprise installed a waste heat recovery heat exchanger using embedded alloy steel gilled tubes (base tube material: 12Cr1MoV alloy steel, fin material: 12Cr1MoV alloy steel, fin height: 20mm, fin pitch: 12mm) to recover the waste heat of the flue gas to heat the production water.
After the installation, the flue gas outlet temperature is reduced to 140℃, the waste heat recovery capacity is 12,000 kW, and the production water temperature is increased from 25℃ to 120℃. The annual waste heat recovery is about 1.05×10⁸ kWh, which can replace 42,000 tons of standard coal per year, save about 21 million yuan in fuel costs, and reduce CO₂ emissions by about 113,400 tons per year, achieving significant energy-saving and environmental protection benefits.
6. Common Quality Problems and Improvement Measures of Gilled Tubes
Although gilled tubes have the advantages of high heat transfer efficiency, long service life, and strong adaptability, they still face some common quality problems in production and application, such as poor fin-base tube bonding, fin damage, corrosion, and fouling, which affect their heat transfer performance and service life. This section analyzes these common problems and proposes corresponding improvement measures.
6.1 Common Quality Problems
- Poor Fin-Base Tube Bonding: This is the most common quality problem of gilled tubes, which is manifested as gaps between the fin and the base tube, or loose combination. For welded gilled tubes, it is mainly caused by welding defects (pores, cracks, incomplete fusion); for embedded and rolled gilled tubes, it is mainly caused by inaccurate dimensional matching or improper process parameters. Poor bonding will increase the gap heat resistance, significantly reduce the heat transfer efficiency, and even lead to fin falling off in high-vibration scenarios.
- Fin Damage: During the manufacturing, transportation, or installation process, the fins are easily scratched, bent, or broken, especially thin fins (thickness < 0.5mm). Fin damage will reduce the effective heat transfer area, affect the flow field of the medium, and reduce the heat transfer efficiency of the gilled tube.
- Corrosion: Corrosion of gilled tubes mainly includes surface corrosion and welding seam corrosion (for welded gilled tubes). Surface corrosion is caused by the corrosion of the medium (such as sulfur dioxide in flue gas, corrosive liquid) or the external environment (such as humidity, salt spray); welding seam corrosion is caused by the poor corrosion resistance of the welding seam or the presence of welding defects. Corrosion will reduce the thickness of the fin and base tube, affect the structural stability, and even lead to tube burst in severe cases.
- Fouling: The fins of gilled tubes have a large surface area and complex flow field, which are easy to accumulate dust, scale, or other impurities, forming a fouling layer. The thermal conductivity of the fouling layer is very low (0.1 to 0.3 W/(m·K)), which increases the fouling resistance, reduces the heat transfer efficiency, and even blocks the flow channel of the medium, affecting the normal operation of the heat exchange system.
6.2 Improvement Measures
- Improving Fin-Base Tube Bonding Quality: For welded gilled tubes, optimize the welding process and parameters, select appropriate welding materials, and strengthen the inspection of welding seams (using non-destructive testing methods such as ultrasonic testing) to eliminate welding defects; for embedded gilled tubes, improve the dimensional accuracy of the base tube groove and fins, and optimize the embedding process parameters to ensure tight interference fit; for rolled gilled tubes, control the rolling speed, pressure, and temperature to ensure the integration of fins and base tube.
- Preventing Fin Damage: Improve the packaging and transportation methods of gilled tubes, use protective sleeves or padding to protect the fins from collision and scratch; strengthen the quality control during installation, avoid forced installation that causes fin bending or breaking; select appropriate fin thickness and material according to the application scenario, and increase the fin strength for high-vibration scenarios.
- Preventing Corrosion: Select corrosion-resistant materials (such as stainless steel, alloy steel) for gilled tubes according to the medium characteristics; perform anti-corrosion treatment on the surface of gilled tubes (such as painting, galvanizing, ceramic coating) to enhance corrosion resistance; for welded gilled tubes, perform post-welding anti-corrosion treatment on the welding seam; optimize the operating parameters to avoid the condensation of corrosive medium on the surface of gilled tubes.
- Preventing and Removing Fouling: Select fin structures that are not easy to foul (such as serrated fins, spiral fins with large pitch) for scenarios with easy fouling; install ash cleaning or descaling devices (such as soot blowers, high-pressure water cleaning devices) to regularly clean the fins; add anti-fouling agents to the heat exchange medium to reduce the precipitation of scale; optimize the flow rate of the medium to reduce the accumulation of impurities on the fins.
7. Future Development Trends of Gilled Tubes
With the continuous advancement of energy conservation and carbon reduction goals, and the development of manufacturing technology, material science, and intelligent technology, gilled tubes will develop towards high efficiency, precision, corrosion resistance, and intelligence, further improving their heat transfer performance and operational reliability, and expanding their application scope.
- High-Efficiency Enhanced Heat Transfer Technology: Develop new fin structures (such as micro-fins, porous fins, and composite fins) to further expand the heat transfer area and improve the convective heat transfer coefficient; optimize the fin shape and arrangement to reduce flow resistance and fouling tendency; adopt bionic design (simulating the structure of biological surfaces) to develop anti-fouling, high-efficiency gilled tubes, further improving heat transfer efficiency.
- High-Performance Material Application: Develop new high-temperature, corrosion-resistant, and high-thermal-conductivity materials (such as ceramic matrix composites, carbon fiber composites, and high-temperature alloy materials) to improve the high-temperature resistance, corrosion resistance, and heat transfer performance of gilled tubes; develop composite material gilled tubes (such as copper-aluminum composite, steel-aluminum composite) to combine the advantages of different materials, reducing cost while ensuring performance.
- Precision and Intelligent Manufacturing: Adopt intelligent manufacturing technologies (such as 3D printing, robot welding, and automatic rolling) to improve the manufacturing precision and production efficiency of gilled tubes; integrate sensors and Internet of Things (IoT) technologies into the manufacturing process to realize real-time monitoring of process parameters and quality control, reducing production defects; develop customized gilled tube manufacturing technologies to meet the personalized needs of different application scenarios.
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