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
CN110842202BActive Publication Date: 2021-11-02INNER MONGOLIA UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INNER MONGOLIA UNIV OF SCI & TECH
Publication Date
2021-11-02

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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