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A free particle/porous medium composite enhanced boiling structure and its preparation method

A technology of enhanced boiling and porous media, applied in heat exchange equipment, lighting and heating equipment, heat transfer modification, etc., can solve the problems of enhanced boiling to maintain long-term performance, increase wall thermal resistance, etc., and achieve delayed critical heat flux The effect of volume, accelerated liquid return rate, bubble movement and small liquid return resistance

Active Publication Date: 2021-11-02
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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  • A free particle/porous medium composite enhanced boiling structure and its preparation method
  • A free particle/porous medium composite enhanced boiling structure and its preparation method
  • A free particle/porous medium composite enhanced boiling structure and its preparation method

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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, which comprises a substrate and a porous matrix structure formed on the surface of the substrate. Several pores are distributed in the porous matrix structure, and dispersed in the cavity There are free particles able to move within the cavity. When preparing the free particle / porous medium composite enhanced boiling structure, metal particles are first sintered to obtain a porous material matrix, holes are formed in the porous material matrix, and then free particles are filled into the cavity and closed. The present invention is based on the activation of nucleation points during the boiling heat transfer process and the enhanced characteristics of the liquid-absorbing core supplying liquid to the nucleation site. The collision in the process strengthens the internal heat conduction, micro-layer evaporation and convective heat transfer of the working fluid, which makes the bubbles easy to nucleate, the growth rate is fast, and the detachment frequency is high, thus realizing the enhanced boiling heat transfer.

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 Patents(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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