A microchannel device and method for enhancing convective heat transfer based on magnetic force

A convective heat transfer and micro-channel technology, applied in the field of micro-channels, can solve the problems of ineffective heat transfer enhancement and limited contact area, and achieve the effect of strong convective heat transfer capability and enhanced convective heat transfer.

Active Publication Date: 2020-11-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the contact area between the microcolumn and the heat transfer medium of this device is limited, and the efficiency of heat transfer enhancement is not increased.

Method used

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  • A microchannel device and method for enhancing convective heat transfer based on magnetic force
  • A microchannel device and method for enhancing convective heat transfer based on magnetic force
  • A microchannel device and method for enhancing convective heat transfer based on magnetic force

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: as figure 1 with 5 As shown, a microchannel device based on magnetic force-enhanced convective heat transfer includes a heat exchange box, and a number of rows of heat exchange microcolumns 7 are fixedly arranged on the heat exchange bottom plate 6 of the heat exchange box along the flow direction of the working fluid. The heat microcolumns 7 form microchannels, and the single heat exchange microcolumns 7 of the Nth row are located on the central axis of two adjacent heat exchange microcolumns 7 in the N-1th row, where N≥2; the top wall of the heat exchange box A chute 9 is provided on the central axis along the flow direction of the working fluid, and a slide block 10 is arranged in the chute 9. The bottom end of the slide block 10 is fixedly provided with a permanent magnet 8 and the permanent magnet 8 is located directly above the microchannel; the heat exchange box The body is arranged on the heat source 5;

[0032] The centers of both ends of the he...

Embodiment 2

[0038] Embodiment 2: The magnetic-based microchannel device for enhanced convective heat transfer in this embodiment is basically the same as in Embodiment 1, except that the distance between each row of adjacent heat transfer microcolumns 7 is 5 μm, and the heat transfer microcolumns The distance between adjacent rows of 7 is 5 μm, the diameter of the microcolumn is 3 μm, and the height of the microcolumn is 15 μm;

[0039] The heat exchange microcolumn 7 is a metal rubber microcolumn, and the outer wall of the metal rubber microcolumn is coated with Fe 3 o 4 Coating, the heat exchange bottom plate 6 of the heat exchange box is coated with a heat-conducting silicone grease layer;

[0040] The length of the heat exchange box is 100 μm, the width is 50 μm, the width of the permanent magnet 8 is 15 μm, and the length is 20 μm, and the distance between the bottom surface of the permanent magnet 8 and the top surface of the heat exchange microcolumn 7 is 20 μm;

[0041] The heat...

Embodiment 3

[0042] Embodiment 3: as Figure 1~5 As shown, the magnetic-based enhanced convective heat transfer method adopts the magnetic-based enhanced convective heat transfer microchannel device, and the specific steps are as follows:

[0043](1) Slide the permanent magnet to the working fluid inlet end of the heat exchange box, pump the working fluid to be heat exchanged into the heat exchange box, and the working fluid to be heat exchanged flows into the microchannel formed by the heat exchange microcolumn, the microchannel The heat-exchanging micro-column is tilted under the magnetic force of the permanent magnet, and the flow of the working fluid to be heat-exchanged is blocked and chaotic, so that the contact area between the working fluid to be heat-exchanged and the heat-exchanging micro-column increases to enhance the heat exchange effect;

[0044] (2) With the flow of the working fluid to be heat exchanged, the permanent magnet slides synchronously along the direction of the w...

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Abstract

The present invention relates to a magnetism-based microchannel apparatus and method with intensified convective heat exchange, and belongs to the field of microchannel technologies. The apparatus comprises a heat exchange box body, wherein several rows of heat exchange microcolumns are fixedly arranged on a heat exchange baseboard of the heat exchange box body along a working medium flow direction, the heat exchange microcolumns form a microchannel, a single heat exchange microcolumn in the Nth row is on a central axis of two adjacent heat exchange microcolumns in the (N-1)th row, wherein N is >= 2; a sliding chute is opened on a top wall of the heat exchange box body along a central axis of the working medium flow direction, a sliding block is disposed inside the sliding chute, a permanent magnet is fixedly arranged on the bottom of the sliding block, and the permanent magnet is right above the microchannel; and the heat exchange box body is disposed above a heat source. According tothe microchannel apparatus and method, when a working medium to be heat exchanged passes through intricately arranged heat exchange microcolumns of a heating box, convective heat exchange is enhanced.

Description

technical field [0001] The invention relates to a microchannel device and method for enhancing convection heat transfer based on magnetic force, and belongs to the technical field of microchannels. Background technique [0002] The problem of heat transfer in microchannel devices has become a hot topic in recent years, such as heat dissipation in CPUs and convective heat transfer of fluids in microfluidic chips. To heat or dissipate the heat exchange working medium in the channel device. However, the contact area between the micro-column and the heat-exchange working medium of this device is limited, and the efficiency of heat transfer enhancement is not increased. Contents of the invention [0003] Aiming at the microchannel heat transfer problem in the prior art, the present invention provides a microchannel device and method for enhancing convective heat transfer based on magnetic force. The present invention has simple structure, increased convective heat transfer are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K7/20
CPCH05K7/2029H05K7/20327
Inventor 李晨何永清焦凤
Owner KUNMING UNIV OF SCI & TECH
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