Liquid metal enhanced heat exchange pipeline

Abstract

The invention belongs to the technical field of heat exchange, and particularly relates to a liquid metal enhanced heat exchange pipeline which comprises a pipeline body, an auxiliary heat exchange cavity and liquid metal. One end of the auxiliary heat exchange cavity is arranged on the pipeline body, and the other end of the auxiliary heat exchange cavity is far away from the pipeline body; the auxiliary heat exchange cavity is filled with the liquid metal. The auxiliary heat exchange cavity is filled with the liquid metal, and compared with a traditional cooling medium, the liquid metal can transfer heat more quickly by means of the ultrahigh heat conductivity of the liquid metal, the heat resistance is reduced, and the overall heat exchange efficiency is improved. In addition, due to the high thermal conductivity of the liquid metal and the optimized heat exchange structure, efficient heat exchange can be achieved in a more compact space, and the requirement for additional cooling fins or heat exchange assemblies is reduced. And compared with a traditional heat exchanger, the heat exchange power density of unit volume is higher, the heat exchanger is suitable for high-power electronic equipment, spaceflight heat dissipation systems and new energy heat exchange equipment, and the requirements for miniaturization and efficient heat dissipation are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of high heat flux density heat transfer, and particularly relates to a heat exchange pipe enhanced by liquid metal. Background Art

[0002] In the field of modern heat transfer technology, efficient heat dissipation and temperature control are crucial for electronic devices, industrial equipment, aerospace systems, and the new energy field. Traditional heat transfer methods mainly include natural convection heat transfer, forced convection heat transfer, phase change heat transfer, and microchannel heat transfer, etc. Common cooling media include water, oil, and air. However, these traditional heat transfer methods have certain limitations in application scenarios such as high heat flux density, rapid heat transfer response, and local high-temperature cooling, such as low heat transfer efficiency, difficulty in solving the problem of local overheating, and large volume (Chinese invention patents CN116507081B, CN116540853B). Summary of the Invention

[0003] To solve the above problems, the present invention provides a heat exchange pipe enhanced by liquid metal, which includes a pipe body, an auxiliary heat exchange cavity, and liquid metal; one end of the auxiliary heat exchange cavity is arranged on the pipe body, and the other end of the auxiliary heat exchange cavity is far away from the pipe body; the liquid metal fills the auxiliary heat exchange cavity.

[0004] The present invention significantly improves the heat transfer efficiency by integrating an auxiliary heat exchange cavity on the pipe body and filling it with high thermal conductivity liquid metal. Compared with traditional heat transfer media (such as water or air), the thermal conductivity of liquid metal is as high as 30 - 80 W / m·K, far exceeding that of traditional coolants, which can quickly transfer heat, reduce thermal resistance, and improve the overall performance of the heat exchange system. At the same time, the design of the auxiliary heat exchange cavity increases the thermal contact area between the liquid metal and the pipe body, optimizes the heat conduction path, enabling heat to be transferred to the external cooling medium more efficiently, thereby improving the heat dissipation capacity. The liquid metal filling solution of the present invention effectively solves the problem of local overheating. Traditional heat exchange pipes often have local high heat flux density regions, which are prone to the accumulation of hot spots, affecting the system stability. By filling the auxiliary heat exchange cavity with liquid metal, the present invention can quickly spread the heat in the local high-temperature region to the entire auxiliary heat exchange cavity, making the temperature distribution more uniform, thereby eliminating local hot spots. In addition, compared with the traditional heat exchange pipe design, the present invention has a more compact structure and a higher heat transfer power density. Due to the high thermal conductivity of liquid metal, the heat exchange capacity per unit volume has been significantly improved, enabling the present invention to handle higher heat flux density without increasing the volume, thereby reducing the dependence on additional heat sinks or heat exchange devices.

[0005] Furthermore, the auxiliary heat exchange cavity is strip-shaped, corrugated or spiral. The strip-shaped structure can produce slight swings in the axial or transverse direction, causing the liquid metal to redistribute continuously and enhancing convective heat transfer. Due to its zigzag design, the corrugated structure is more likely to form periodic swings under vibration or fluid impact, improving the heat diffusion ability. The spiral structure has a natural torsional characteristic and can undergo small deformations or rotational swings under the influence of heat or flow pressure, enhancing the eddy current heat transfer effect. Combining these shapes with the swinging characteristics makes the flow of the liquid metal more active and improves the overall heat transfer performance.

[0006] Furthermore, the material of the auxiliary heat exchange cavity is copper alloy, titanium alloy, aluminum alloy, thermal conductive silica gel, or graphene-doped silicone rubber. These materials all have good thermal conductivity and certain elasticity, and can produce a micro-swing effect under the action of external force or thermal expansion, further promoting the flow and heat transfer of the liquid metal.

[0007] Furthermore, the liquid alloy is a gallium-based alloy, an indium-based alloy, or a tin-based alloy.

[0008] Furthermore, the liquid alloy fills 70% to 90% of the volume of the auxiliary heat exchange cavity, that is, the liquid metal does not completely fill the auxiliary heat exchange cavity. On the one hand, reserving some space can buffer the thermal expansion effect of the liquid metal, avoiding excessive internal pressure in the cavity due to temperature rise, thereby improving the stability and service life of the system. On the other hand, partial filling can enhance the convective heat transfer ability of the liquid metal, causing natural convection or flow disturbances under the action of the heat source, promoting rapid heat diffusion, and further improving the heat transfer efficiency. On the other hand, under the action of swing or vibration, the unfilled space allows the liquid metal to flow freely, forming a stronger eddy current heat transfer effect. Compared with the static heat conduction mode of complete filling, it can effectively avoid local overheating problems and make the heat transfer more uniform.

[0009] Furthermore, the end of the auxiliary heat exchange cavity fixed to the pipe body is thick, and the end of the auxiliary heat exchange cavity away from the pipe body is thin, forming a gradient shape. The thicker fixed end enhances the contact area with the pipe body, improves the structural stability, makes the auxiliary heat exchange cavity more firmly fixed on the pipe, and avoids loosening or displacement caused by vibration or thermal expansion. In addition, more liquid metal is distributed at the fixed end. This area is close to the pipe body and can receive and transfer heat faster, thereby improving the overall heat transfer efficiency. At the same time, the end away from the pipe is thinner, which can produce changes in flow velocity and pressure gradient when the liquid metal flows, promoting the convective effect of the liquid metal and making the heat transfer more uniform.

[0010] Furthermore, one end of the auxiliary heat exchange cavity extends into the pipe body, and the other end of the auxiliary heat exchange cavity is away from the pipe body. Since the fluid flow inside the pipe exerts an impact force or shear force on the extended auxiliary heat exchange cavity, the auxiliary heat exchange cavity will generate micro - swing or vibration within a certain range. This swing effect can not only promote the flow of liquid metal inside the cavity, enhance the convective heat transfer ability, but also increase the contact area between the liquid metal and the cavity wall, thereby improving the heat transfer efficiency. In addition, the swing can prevent the liquid metal from staying in a certain area, reduce local overheating phenomena, make the heat exchange more uniform, and further optimize the overall heat exchange performance.

[0011] Furthermore, it also includes an ultrasonic source, which is fixed on the pipe body. The ultrasonic source emits surface acoustic waves (SAWs) that propagate along the outer surface of the pipe body. The propagation of the surface acoustic waves will cause micro - vibrations on the pipe surface, thereby driving the auxiliary heat exchange cavity to resonate or swing periodically, enhancing the fluidity of the liquid metal, and forming stronger convection and eddy current effects inside the auxiliary heat exchange cavity, accelerating heat diffusion. In addition, the ultrasonic vibration can also reduce the surface tension of the liquid metal, improve its contact condition with the inner wall of the cavity, thereby reducing the heat transfer resistance and enhancing the overall heat exchange performance. This ultrasonic driving method can dynamically enhance heat exchange without additional mechanical movement, and is particularly suitable for high - heat - flux density heat dissipation applications, such as electronic cooling, aerospace thermal management, and heat dissipation of high - performance computing devices.

[0012] Furthermore, the auxiliary heat exchange cavity is an annular shape with a horizontal side, and the horizontal side is fixed on the pipe body. Since the surface acoustic waves propagate along the pipe body, vibrations will be generated on the horizontal side of the annular auxiliary heat exchange cavity, causing the liquid metal to be driven by periodic sound waves inside the cavity, thereby forming an orderly moving flow or micro - convection. This flow effect not only accelerates the heat diffusion of the liquid metal, but also reduces local retention and heat accumulation, prevents the generation of temperature gradients inside the heat exchange cavity, and further improves the heat exchange uniformity. In addition, under the drive of the surface acoustic waves, the annular structure can also induce the liquid metal to generate rotational or oscillating motion along the annular path. Compared with the traditional straight or closed cavity structure, it can make more full use of the high thermal conductivity of the liquid metal and improve the overall heat exchange efficiency.

[0013] Advantages of the present invention: (1) The present invention uses liquid metal to fill the auxiliary heat exchange cavity. Utilizing its ultra - high thermal conductivity, it can transfer heat faster than traditional cooling media, reduce the thermal resistance, and improve the overall heat exchange efficiency.

[0014] (2) Convection can be formed by the liquid metal in the auxiliary heat exchange cavity, effectively eliminating local high - heat - flux regions and preventing the accumulation of hot spots. Compared with traditional heat exchange tubes, the present invention can quickly diffuse heat, ensure uniform temperature inside the heat exchange cavity, thereby improving the system stability and avoiding the decline or damage of equipment performance caused by local overheating.

[0015] (3) Due to the high thermal conductivity of the liquid metal and the optimized heat exchange structure, the present invention can achieve efficient heat exchange in a more compact space, reducing the need for additional heat sinks or heat exchange components. Compared with traditional heat exchangers, the heat exchange power density per unit volume is higher, making it suitable for high-power electronic devices, aerospace heat dissipation systems, and new energy heat exchange devices, meeting the requirements of miniaturization and efficient heat dissipation.

[0016] Considering the above beneficial effects, the present invention has good application prospects in the field of heat exchange technology. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of a heat exchange pipe reinforced with liquid metal.

[0018] Figure 2 It is a schematic diagram of another heat exchange pipe reinforced with liquid metal.

[0019] Figure 3 It is a schematic diagram of yet another heat exchange pipe reinforced with liquid metal.

[0020] Figure 4 It is a schematic diagram of yet another heat exchange pipe reinforced with liquid metal.

[0021] In the figure: 1, pipe body; 2, auxiliary heat exchange chamber; 3, liquid metal; 4, ultrasonic source. Detailed Embodiments

[0022] To make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the following examples are given with reference to the accompanying drawings to further elaborate on the present application in detail.

[0023] Embodiment 1 This embodiment provides a heat exchange pipe reinforced with liquid metal. As Figure 1 shown, the heat exchange pipe includes a pipe body 1, an auxiliary heat exchange chamber 2, and a liquid metal 3. The pipe body 1 has a circular cross-section and is made of an aluminum alloy material (6061-T6) with an outer diameter of 20 mm and a wall thickness of 2 mm. The auxiliary heat exchange chamber 2 is strip-shaped. One end of the strip-shaped auxiliary heat exchange chamber 2 penetrates the wall of the pipe body 1 and contacts the fluid inside the pipe body 1. The other end of the strip-shaped auxiliary heat exchange chamber 2 is suspended outside the pipe body 1. The auxiliary heat exchange chamber 2 is made of a copper alloy with a thickness of 1.5 mm and an inner diameter of 5 mm. Additionally, the auxiliary heat exchange chamber 2 can also be a spiral structure, and the axial direction of the spiral structure is along the normal direction of the pipe body. The spiral structure is more likely to vibrate under external force, promoting the flow of the liquid metal 3.

[0024] In this embodiment, a gallium-based alloy (GaInSn, 68.5% Ga, 21.5% In, 10% Sn) is selected as the liquid metal 3 and filled into the auxiliary heat exchange cavity 2. Its thermal conductivity is as high as 35 W / m·K, far exceeding that of traditional coolants. To optimize the heat exchange efficiency, the filling rate of the liquid metal is controlled at 80%, leaving 20% of the space for buffering thermal expansion and promoting the convective heat transfer of the liquid metal 3. During operation, heat is transferred from the pipe body 1 to the auxiliary heat exchange cavity 2. The liquid metal 3 evenly transmits the heat to the entire auxiliary heat exchange cavity 2 through natural convection and thermal diffusion, improving the overall heat exchange efficiency and effectively avoiding local overheating

[0025] During preparation, first, cut the copper alloy pipe to meet the dimensional requirements of the long strip-shaped auxiliary heat exchange cavity 2 and seal one end; then, fill the liquid metal 3 into the auxiliary heat exchange cavity 2 by capillary injection; next, seal the other end of the auxiliary heat exchange cavity 2; then, drill holes in the pipe body 1 and weld the auxiliary heat exchange cavity 2 to the pipe body 1. When filling the liquid metal 3, the vacuum filling method can be used to avoid bubble residues and improve the filling uniformity and heat exchange efficiency. Specifically, first place the auxiliary heat exchange cavity 2 in a vacuum chamber and use a vacuum pump to evacuate the air in the cavity to a low-pressure environment. Then, heat the liquid metal 3 to an appropriate temperature (40 - 60°C) to reduce its viscosity and improve its fluidity. Then, through capillary injection or pressure injection, the liquid metal 3 slowly flows into the auxiliary heat exchange cavity 2 in a vacuum environment, reducing the formation of bubbles. After filling, gradually restore to normal pressure and immediately seal the opening of the auxiliary heat exchange cavity 2. In addition, when filling the liquid metal 3, degassing treatment can also be used to remove the dissolved gases and micro-bubbles in the liquid metal 3, improving the filling uniformity and heat exchange efficiency.

[0026] The heat exchange method of the present invention can be adjusted according to application requirements. It can be used in a heat dissipation mode with high temperature inside and low temperature outside, or in a heating mode with high temperature outside and low temperature inside. In the heat dissipation mode, the fluid inside the pipe body 1 is a high-temperature working medium. The liquid metal 3 quickly absorbs heat in the auxiliary heat exchange cavity 2 and efficiently transfers it to the external cooling medium (such as air or a water cooling system) to achieve rapid heat dissipation, which is suitable for applications such as electronic device cooling, high-power device heat dissipation, and engine cooling. In the heating mode, an external heat source (such as a high-temperature gas stream, a heating element, or an industrial furnace) provides heat. The liquid metal 3 evenly transfers the heat to the inside of the pipe body 1, raising the temperature of the low-temperature fluid and improving the heat exchange efficiency. This mode is suitable for applications such as low-temperature liquid heating, aerospace thermal management, and chemical heating systems. Due to the high thermal conductivity of the liquid metal, the present invention can uniformly and efficiently transfer heat under both cooling and heating conditions, avoid local overheating or overcooling, improve the overall heat exchange performance, and meet the requirements of various heat exchange applications.

[0027] Embodiment 2 Based on Embodiment 1, as Figure 2 shown, the auxiliary heat exchange cavity 2 of this embodiment adopts a structural design where the fixed end is thicker and the end far from the pipe body 1 is thinner. Specifically, the inner diameter of the end of the auxiliary heat exchange cavity 2 fixed on the pipe body 1 increases to 6 mm, and the inner diameter of the end far from the pipe body 1 gradually decreases to 4 mm, forming a tapered gradual transition. This structure enables a larger storage capacity of the liquid metal 3 at the fixed end, higher heat exchange efficiency, and at the same time optimizes the flow characteristics of the liquid metal 3, prompting speed changes and disturbances during its flow, further enhancing the heat exchange capacity. In addition, this gradient shape enhances the fixing stability of the auxiliary heat exchange cavity 2, preventing loosening caused by thermal expansion or fluid impact, and making the system operation more stable and reliable.

[0028] Preferably, a flagellar structure is arranged inside the fixed end to optimize the fluidity of the liquid metal 3 and improve the overall heat exchange efficiency. The flagella swing under the action of an external driving force (such as the fluid inside the pipe body 1), thereby agitating the liquid metal 3, enhancing the convective heat exchange capacity, and preventing the liquid metal 3 from accumulating or the flow rate from decreasing in the fixed end area, ensuring uniform heat diffusion.

[0029] Embodiment 3 Based on Embodiment 1, as Figure 3 shown, one end of the auxiliary heat exchange cavity 2 of this embodiment partially extends into the pipe body 1, while the other end is still far from the pipe body 1. Specifically, the fixed end of the auxiliary heat exchange cavity 2 extends 5 mm radially inward and partially embeds into the inner wall of the pipe body 1, making it directly contact the fluid inside the pipe. This design enables the fluid flowing inside the pipe to exert an impact force or shear force on the auxiliary heat exchange cavity 2, thereby causing the auxiliary heat exchange cavity 2 to produce slight swings under the flow action, enhancing the fluidity of the liquid metal 3, and promoting convective heat exchange. Compared with Embodiment 1, this structure further improves the heat exchange efficiency of the liquid metal 3 and can better adapt to the fluid heat exchange environment, especially suitable for high-speed fluid cooling systems.

[0030] Embodiment 4 Based on Embodiments 1 - 3, this embodiment further fixes an ultrasonic wave source 4 on the outer surface of the pipe body 1 for exciting surface acoustic waves propagating along the outer surface of the pipe. When the surface acoustic waves propagate on the pipe body 1, they will drive the auxiliary heat exchange cavity 2 to generate micro-vibrations, thereby enhancing the fluidity of the liquid metal 3, forming stronger convection and eddy current effects inside the auxiliary heat exchange cavity 2, accelerating heat diffusion, and improving the heat exchange efficiency.

[0031] Specifically, the piezoelectric transducer array of the ultrasonic wave source (4) is attached to the outer wall of the pipe in a spiral arrangement, and the phase difference between adjacent transducers is set to 90°, exciting surface acoustic waves propagating along the axial direction of the pipe. The relationship between the acoustic wave wavelength λ and the pipe circumference C satisfies the formula: According to the pipe diameter D and the preferred frequency f, an asymmetric acoustic streaming mode can be excited to cause the liquid metal to generate a precessional motion.

[0032] Specifically, the frequency range of the ultrasonic source 4 is adjustable (20 - 80 kHz), and it can respectively achieve the following in the low-frequency region (20 - 40 kHz): exciting large-scale acoustic streaming vortices to promote overall convection; in the high-frequency region (60 - 80 kHz): forming dense standing wave nodes to achieve local micro-region temperature control; using acoustic radiation force, by adjusting the frequency to make the standing wave nodes coincide with the hot spot positions, and the formula is as follows: where α is the acoustic absorption coefficient of the liquid metal, I is the acoustic intensity, and c is the speed of sound.

[0033] In addition, ultrasonic vibration can reduce the surface tension of the liquid metal 3, improve the contact between the liquid metal 3 and the wall of the auxiliary heat exchange cavity 2, reduce the thermal resistance, and make the heat exchange more uniform. Compared with Embodiments 1 - 3, this ultrasonic driving method actively enhances the heat exchange effect without mechanical movement.

[0034] Embodiment 5 Based on Embodiment 4, the auxiliary heat exchange cavity 2 of this embodiment adopts an annular structure with a horizontal side and is fixed on the pipe body 1 through its horizontal side. Under the action of the surface acoustic wave, this annular structure can receive ultrasonic vibration energy more uniformly, thereby enhancing the overall vibration effect of the auxiliary heat exchange cavity 2, promoting the formation of an orderly flow or micro-convection of the liquid metal 3 in the cavity, and further improving the heat exchange efficiency. At the same time, under the excitation of ultrasonic waves, the annular structure can induce the liquid metal 3 to generate rotational or oscillatory motion along the annular channel. Compared with the traditional heat exchange cavity with a straight or spiral structure, it is easier to form a stable flow pattern of the liquid metal 3, making the heat diffusion more uniform and improving the overall heat exchange performance.

[0035] Embodiment 6 In this embodiment, magnetic particles are filled at the end of the auxiliary heat exchange cavity 2, and an alternating magnetic field is applied externally to enhance the vibration effect of the auxiliary heat exchange cavity 2, thereby further improving the heat exchange performance.

[0036] At the outer end of the auxiliary heat exchange cavity 2, magnetic particles with a diameter of 50 - 200 μm and a volume fraction of 1 - 5% are evenly distributed. The magnetic material can be selected from nickel, ferrite or neodymium iron boron microparticles, which form a solid-liquid cluster structure with the liquid metal through van der Waals forces. An alternating magnetic field source (frequency range 1 - 100 kHz) is set outside the auxiliary heat exchange cavity 2, which can be realized by an electromagnetic coil or a permanent magnet rotating mechanism. When the alternating magnetic field acts on the magnetic particles, the magnetic particles are driven by the periodic magnetic force, and the particles generate magnetophoretic force, causing the auxiliary heat exchange cavity 2 to generate micro-vibrations or resonances. At the same time, the movement of the particles drives the liquid metal to form a shear flow, effectively breaking the surface oxide film and further promoting the flow of the liquid metal 3, so that eddies or micro-convections are formed inside the auxiliary heat exchange cavity 2, strengthening the heat diffusion.

[0037] Compared with the ultrasonic driving method in Embodiment 5, the alternating magnetic field driving method in this embodiment does not require mechanical contact and is applicable to a closed heat exchange system. At the same time, the adjustable magnetic field allows optimizing the vibration frequency of the heat exchange cavity under different working conditions to obtain the best heat exchange effect. Under the condition of the same power load, compared with the pure heat conduction mode, the heat transfer coefficient of this scheme is greatly improved, and through frequency adjustment, it can be achieved that: in the low-frequency mode (<100 Hz): suitable for uniform heat dissipation requirements; in the high-frequency mode (>1 kHz): for quickly eliminating local hot spots; in the dynamic frequency sweeping mode (1 - 10 kHz modulation): preventing the solidification of the flow boundary layer; this scheme is especially suitable for the cooling of electronic devices, high heat flux density heat exchange systems and the thermal management of precision instruments, which can further improve the heat exchange ability of the liquid metal and ensure the stable operation of the system.

[0038] It should be noted that in the present invention, the micro-swing of the auxiliary heat exchange cavity 2 can not only enhance the internal heat exchange of the liquid metal 3, but also promote the heat exchange between the auxiliary heat exchange cavity 2 and the external cooling medium, thereby improving the overall heat exchange effect. The micro-swing causes the liquid metal 3 to generate convection and eddies inside the cavity, accelerating the heat transfer to the wall of the auxiliary heat exchange cavity 2 and reducing local overheating. At the same time, the swing of the auxiliary heat exchange cavity 2 continuously disturbs the boundary layer of the external cooling medium, reducing the thermal resistance and improving the heat exchange efficiency. This dual heat exchange enhancement mechanism makes the overall heat dissipation effect more uniform and efficient, and is applicable to high power density heat dissipation scenarios.

[0039] In summary, the present invention provides a heat exchange pipe enhanced by liquid metal. By providing an auxiliary heat exchange cavity 2 on the pipe body 1 and filling it with high thermal conductivity liquid metal 3, the heat exchange efficiency is greatly improved. At the same time, the structural design is optimized to avoid local overheating problems. To improve the heat dissipation efficiency, the present invention also introduces an ultrasonic source 4 or an alternating magnetic field, and uses surface acoustic waves or a magnetic field to drive magnetic particles, so that the auxiliary heat exchange cavity 2 vibrates, thereby enhancing the fluidity of the liquid metal 3 and accelerating heat diffusion. The present invention has a compact structure, high heat exchange efficiency, uniform heat dissipation, stability and reliability, and can be widely applied to high-power electronic cooling, aerospace heat dissipation, industrial heat exchange systems, new energy thermal management and other fields.

[0040] The foregoing is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of protection of the present application.

Claims

1. A liquid metal enhanced heat exchange pipe, characterized in that: It comprises a pipeline body, an auxiliary heat exchange cavity and liquid metal, one end of the auxiliary heat exchange cavity is arranged on the pipeline body, one end of the auxiliary heat exchange cavity is away from the pipeline body, and the liquid metal fills the auxiliary heat exchange cavity.

2. The liquid metal enhanced heat exchange pipe according to claim 1, characterized in that: The auxiliary heat exchange cavity is in the shape of a long strip, a corrugated shape or a spiral shape.

3. The liquid metal enhanced heat exchange pipe according to claim 1, characterized in that: The auxiliary heat exchange cavity is made of copper alloy, titanium alloy, aluminum alloy, thermal conductive silicone rubber, or graphene-doped silicone rubber.

4. The liquid metal enhanced heat exchange pipe according to claim 1, characterized in that: The liquid alloy is a gallium-based alloy, an indium-based alloy, or a tin-based alloy.

5. The liquid metal enhanced heat exchange pipe according to claim 1, characterized in that: The liquid alloy fills 70% to 90% of the volume of the auxiliary heat exchange cavity.

6. The liquid metal enhanced heat exchange pipe according to claim 1, characterized in that: The auxiliary heat exchange cavity is thick at one end fixed to the pipeline body, and thin at one end away from the pipeline body.

7. The liquid metal enhanced heat exchange pipe according to claim 1, characterized in that: One end of the auxiliary heat exchange cavity extends into the pipeline body, and the other end of the auxiliary heat exchange cavity is away from the pipeline body.

8. The liquid metal enhanced heat exchange pipe according to any one of claims 1 to 7, characterized in that: It also includes an ultrasonic source, which is fixed on the pipeline body.

9. The liquid metal enhanced heat exchange pipe according to claim 8, characterized in that: The ultrasonic source emits surface acoustic waves that propagate along the outer surface of the pipe body.

10. The liquid metal enhanced heat exchange pipe according to claim 9, characterized in that: The auxiliary heat exchange cavity is in a ring shape with a horizontal edge, and the horizontal edge is fixed on the pipeline body.

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