A Porous Boiling Surface Preparation Method With Controlled Vaporization Core

A technology of vaporizing core and boiling surface, applied in the field of heat transfer enhancement, which can solve the problems of deteriorating heat transfer performance and prolonging the time of bubble detachment, so as to achieve the effects of promoting transportation, promoting technological innovation, and suppressing over-density

Active Publication Date: 2017-03-01
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

In fact, the dense nucleation centers on the surface of the porous structure will also cause the interaction between multiple adjacent vaporized core bubbles, the mutual inhibition or fusion between the bubbles, and the bubbles are inhibited to prolong the bubble detachment time or form on the heat transfer surface Air thermal resistance layer will significantly deteriorate its heat transfer performance

Method used

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  • A Porous Boiling Surface Preparation Method With Controlled Vaporization Core
  • A Porous Boiling Surface Preparation Method With Controlled Vaporization Core
  • A Porous Boiling Surface Preparation Method With Controlled Vaporization Core

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preparation example Construction

[0028] figure 1 It is a schematic flow chart of the preparation method of the fixed vaporization core porous boiling heat transfer surface. The preparation process is mainly divided into four operating steps: (a) accumulation of metal particles on the heat exchange surface (b) preparation of green embryos by pressing the metal particles on the surface of the template (c) blending and sintering under the protection of inert gas (d) demoulding to obtain vaporized The porous boiling surface of the core cavity.

[0029] In the step of accumulating metal particles on the heat exchange surface, first, the common heat exchange metal sample 1 needs to be cleaned and decontaminated, and the oxide layer is removed; then suitable metal micro-nano particles 2 are selected and screened to ensure that the particles are uniform Ensure that the sintered capillary gaps are not filled by tiny particles. The screened micro-nano particles 2 are deposited on the heat transfer base surface of the...

Embodiment 1

[0034] Sintering a metallic copper porous metal surface with a fixed vaporization core:

[0035] Choose copper metal as the heat exchange metal base material 30mm×40mm, firstly perform ultrasonic surface cleaning treatment; select metal Cu / CuO micron particles with a scale of 10 μm with good heat transfer performance; use a biological scraper to spread the metal particles on the substrate surface so that its thickness is around 100‐200 microns. Using the laser etching method, etched two rows of regular microcolumn structures with an equivalent diameter of 40μm on the photolithographic silicon surface of 30mm×40mm in size, and the height of the microcolumns is 25μm. The mold agent oxidizes polyethylene wax, put the template in the positioning cover, press it on the top of the metal particle layer, and assemble it in the positioning groove; sinter under nitrogen protection at 750°C for 3 hours, and then naturally cool under nitrogen protection; finally demould to obtain fixed va...

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Abstract

The invention belongs to the technical field of enhanced heat transfer and discloses a preparation method which is used for a porous boiling surface and capable of controlling a vaporization core. The preparation method comprises the steps that a template of the vaporization core is designed; a top layer with metal micro-nano particles is pressed and covered; and a co-sintering-demolding process is conducted to obtain the porous boiling heat-transfer surface with the fixed vaporization core. According to the preparation method, the problem that the vaporization core of the boiling surface is distributed in an uncontrollable mode is solved, and the phenomenon that boiling bubbles are too intensive and converge on the porous heat-transfer surface is effectively controlled. Technical improvement in the field of heat exchanger is facilitated. The preparation method is started from a porous heat-transfer mechanism, and distribution of the vaporization core is controlled technically. The boiling heat-transfer process is intensified from a principle of bubble dynamics, and another novel development direction and processing technology are provided for the porous heat-transfer surface on the rise, so that a basis is better provided for studying boiling bubble dynamics academically. The preparation method has profound academic value and significant social benefits.

Description

technical field [0001] The invention belongs to the technical field of heat transfer enhancement, in particular to a method for preparing a porous boiling surface capable of controlling the vaporization core. Background technique [0002] As a high-efficiency heat transfer method, boiling phase change heat transfer is widely used in high-efficiency heat exchangers, rapid cooling, and energy storage. However, in view of the phenomenon of film boiling or dry wall in the boiling process, the heat transfer efficiency is significantly reduced, and even the equipment is burned. In the actual application process, the boiling heat transfer must be controlled in the nucleate boiling stage with high heat transfer coefficient and low wall temperature; or in order to avoid dry wall and burnout phenomenon, increase the requirements for equipment materials and limit the application conditions of heat exchangers. Therefore, to improve the heat transfer efficiency of boiling phase change a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28F21/08
Inventor 陈宏霞徐进良
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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