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A self-generated potential-excited microbubble-enhanced evaporative heat transfer tube

A heat exchange tube and micro-bubble technology, applied in electrical components, electrical components, electromechanical devices, etc., can solve the problems of increased exergy loss, heat transfer area and heat transfer temperature difference cannot be changed at will, high heat transfer temperature difference, etc. The effect of superheat, lowering onset of boiling, increasing density

Active Publication Date: 2022-08-05
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In micro heaters, due to the limitations of equipment materials, processes and working fluid temperature, the heat transfer area and heat transfer temperature difference cannot be changed arbitrarily. At the same time, the high heat transfer temperature difference will greatly increase the exergy loss

Method used

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  • A self-generated potential-excited microbubble-enhanced evaporative heat transfer tube
  • A self-generated potential-excited microbubble-enhanced evaporative heat transfer tube
  • A self-generated potential-excited microbubble-enhanced evaporative heat transfer tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, a self-generated potential-excited microbubble-enhanced evaporation heat exchange tube, including a heat exchange tube 1, characterized in that the left and right ends of the heat exchange tube 1 are respectively fixedly connected with an axially fixed shaft 2, and two sets of A central fixed shaft 3 placed in the heat exchange tube 1 is fixedly connected between the axially fixed shafts 2, and three groups of conical rings 4 are fixedly connected at horizontal intervals on the central fixed shaft 3. 4 is fixedly connected with an array of permanent magnets 5 along the circumferential direction. The ring 4 is rotatably connected with a rotating blade 7 sleeved on the central fixed shaft 3, the rotating blade 7 is provided with a coil 8, and the bottom of the rotating blade 7 is fixedly connected with a micro heater 9 connected with the coil 8. .

[0031] When this embodiment is in use, the left and right ends of the heat exchange tube 1 are respectively f...

Embodiment 2

[0033] Embodiment 2, on the basis of Embodiment 1, the permanent magnets 5 are distributed between the circumferential array micro-holes 6 and the number is even and distributed in pairs, and each pair of permanent magnets 5 is 180 degrees symmetrical, The number of blades of the rotating blades 7 is even and distributed in pairs, and each pair of rotating blades 7 is 180 degrees symmetrical.

[0034] When this embodiment is used, the number of rotating blades 7 is six, and the distance between each group is one hundred and eighty degrees. The number of blades of the rotating blades 7 is even and distributed in pairs, and each pair of rotating blades 7 is one hundred and eighty degrees. Symmetrical, the rotating blade 7 is in the shape of a right-angled trapezoid and the gradient of the oblique waist of the blade is consistent with the gradient of the outer surface of the tapered ring 4. The length of the lower bottom of the rotating blade 7 is greater than the length of the up...

Embodiment 3

[0035] Embodiment 3, on the basis of Embodiment 1, the tapered ring 4 is made of polymer heat-resistant insulating material, its outer surface is coated with a layer of high thermal conductivity material, and the coil 8 is coated with a Layer enameled wire.

[0036] When this embodiment is used, the conical ring 4 is made of polytetrafluoroethylene, which is coated with graphene high thermal conductivity material, which can increase the heat transfer on the surface of the conical ring 4, improve the superheat of the surface, and increase the effective nucleation. point density, thereby enhancing the heat transfer effect.

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Abstract

The invention belongs to the technical field of micro-heaters, in particular to a self-generated potential excited micro-bubble-enhanced evaporation heat exchange tube. The conical ring is provided with micro-holes in the axial direction, and permanent magnets are embedded in the conical ring to form a magnetic field. The fluid passes through the conical ring micro-holes to form a jet impinging blade to make it rotate, and a thin boundary layer will be formed near the stagnation point of the jet impingement, thereby enhancing the heat transfer efficiency. During the rotation of the blade, the coil cuts the magnetic field line in the magnetic field to form an electromotive force, and the thermal effect of the current prompts the micro-heater to work to excite the micro-bubbles, triggering the starting point of boiling and enhancing the boiling heat transfer. At the same time, the blade rotation increases the disturbance in the tube, increases the turbulence degree, reduces the angle between the fluid velocity field and the temperature gradient field in the tube, improves the degree of field synergy, and strengthens the heat transfer in the tube.

Description

technical field [0001] The invention belongs to the technical field of micro-heaters, in particular to a self-generated potential-excited micro-bubble-enhanced evaporation heat exchange tube. Background technique [0002] In my country, most of the energy consumption industry comes from thermal energy. In the process of thermal energy transfer, micro heater is the main component of energy exchange, which is widely used in nuclear energy, metallurgy, petrochemical industry, air conditioning and refrigeration industries. Its performance has an important influence on the reliability and economy of the system. Improving the heat exchange efficiency of micro heaters is the main way to optimize heat exchange equipment and achieve energy saving and emission reduction. [0003] As a kind of micro heater, the evaporator absorbs the heat required for evaporation through the liquid, and promotes the liquid to boil and vaporize. The heat transfer coefficient of phase change heat trans...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28F13/02F28F13/12C02F1/04H02K7/18
CPCF28F13/02F28F13/125C02F1/04H02K7/1807
Inventor 曹泷赵露星吕财杨辉吴学红王涛
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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