Free particle/porous medium composite enhanced boiling structure and preparation method thereof

A technology to strengthen boiling and porous media, applied in heat exchange equipment, lighting and heating equipment, heat transfer modification and other directions, can solve the problems of increasing wall thermal resistance, strengthening the long-term effect of boiling, and speeding up the liquid reflux rate. , delayed critical heat flux, flexible operation effect

Active Publication Date: 2020-02-28
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Inspired by the enhancement of boiling heat transfer by nanofluids, the collision of nanoparticles during the boiling process can enhance the heat conduction inside the working fluid and the turbulence of the liquid, but the agglomeration of nanofluids cannot maintain the long-term effect of enhanced boiling, and the thickness of the sedimentation layer increases will increase the wall thermal resistance

Method used

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  • Free particle/porous medium composite enhanced boiling structure and preparation method thereof
  • Free particle/porous medium composite enhanced boiling structure and preparation method thereof
  • Free particle/porous medium composite enhanced boiling structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The preparation method of the particle / porous medium composite enhanced boiling structure specifically includes the following steps:

[0048] (1) Heating the substrate (50mm×50mm), and using 800 mesh, 1200 mesh, 1500 mesh, 2000 mesh, and 3000 mesh sandpaper to polish the substrate in sequence;

[0049] (2) Copper particle and barium chloride are mixed by volume ratio 4:1, and add the ethanol of mixing particle volume 5% to make it bond in the mixed particle, the mixture is packed in the diamond mold (30mm * 30mm), Put it on the polished surface of red copper, apply a pressure of 16MPa to compact the mixture to obtain a porous layer with a thickness of 1mm; sinter at about 870°C for 40min in a hydrogen atmosphere, cool naturally, remove the pore-forming agent by ultrasonic cleaning, and dry in vacuum to obtain Porous matrix;

[0050] (3) Mechanically perforate the porous substrate to form a cavity with a diameter of 0.5mm, a hole spacing of 1.5mm, and a hole array of 12...

Embodiment 2

[0054] The preparation method of the particle / porous medium composite enhanced boiling structure specifically includes the following steps:

[0055] (1) Heating the substrate (50mm×50mm), and using 800 mesh, 1200 mesh, 1500 mesh, 2000 mesh, and 3000 mesh sandpaper to polish the substrate in sequence;

[0056] (2) Copper particle and barium chloride are mixed by volume ratio 4:1, and add the ethanol of mixing particle volume 5% to make it bond in the mixed particle, the mixture is packed in the diamond mold (30mm * 30mm), Put it on the polished surface of red copper, apply a pressure of 16MPa to compact the mixture, and obtain a porous layer with a thickness of 1mm; sinter at about 870°C for 40min in a hydrogen atmosphere, cool naturally for 12h, remove the pore-forming agent by ultrasonic cleaning, and dry in vacuum. Porous matrix;

[0057] (3) Holes are formed by laser perforation in the cross-section of the porous substrate, with a diameter of 0.5mm and a hole spacing of 4m...

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Abstract

The invention discloses a free particle / porous medium composite enhanced boiling structure. The structure comprises a substrate and a porous matrix structure formed on the surface of the substrate, aplurality of pore cavities are formed in the porous matrix structure, and free particles capable of moving in the pore cavity are dispersed in the pore cavity. When the free particle / porous medium composite enhanced boiling structure is prepared, metal particles are sintered to prepare a porous material matrix, the porous material matrix is drilled to form the pore cavity, and then the pore cavityis filled with free particles and sealed. The structure is based on the enhancing characteristics of nucleation activation in the boiling heat transfer process and liquid supply of a liquid absorbingcore to a nucleation site, bubbles are prevented from being mixed and the liquid backflow resistance is reduced by means of bubble nucleation and liquid supply partition. Meanwhile, the free particles collide with one another in the boiling process, so that heat transfer, microlayer evaporation and convective heat transfer in working fluid are enhanced, bubble nucleation is easy, the growth speedis high, the separation frequency is high, and therefore the enhanced boiling heat transfer is realized.

Description

technical field [0001] The invention belongs to the technical field of enhanced boiling heat transfer, and specifically relates to an enhanced boiling composite structure obtained by dispersing free particles in a porous medium, a preparation method and application thereof. Background technique [0002] Porous surface boiling heat transfer enhancement technology is one of the focus issues of future industrial development. Porous surface enhanced boiling heat transfer can obtain a large heat transfer coefficient under the condition of small superheat and can effectively improve energy utilization efficiency. It is widely used in the key process of important industrial fields such as thermal power, nuclear power, geothermal energy, solar energy, petrochemical industry, food engineering and low temperature engineering, and has very important social and economic value. The main ways to enhance heat transfer are mainly from the surface modification of heat exchange elements, swir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/11B22F3/02B22F3/10F28F13/18
CPCB22F3/02B22F3/1007B22F3/11F28F13/185
Inventor 郎中敏吴刚强兰大卫
Owner INNER MONGOLIA UNIV OF SCI & TECH
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