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Method and device for testing heat pipe wick capillary on basis of quantum dots

A test method, quantum dot solution technology, applied in the direction of measuring device, suspension and porous material analysis, surface/boundary effect, etc., can solve the problem that it is difficult to accurately judge the meniscus of capillary flow, affect the accuracy of measurement results, and make capillary accurate Measurement and other issues, to achieve the effect of simple structure, easy cleaning, high accuracy

Active Publication Date: 2017-02-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the working medium is mostly transparent, it is difficult to accurately judge the position of the capillary flow meniscus by visual observation; and when the liquid absorption weighing method is used, an additional meniscus will be generated outside the liquid-absorbing core, which will cause errors in the test results
Therefore, some scholars have used photosensitive elements such as fluorescent dyes to highlight the meniscus, but fluorescent dyes will change the thermal properties of the working fluid, including surface tension and viscosity, and affect the accuracy of measurement results.
The above shows that the existing test methods are difficult to achieve accurate measurement of capillary, and it is necessary to propose a more effective method to accurately measure the capillary inside the heat pipe liquid wick

Method used

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  • Method and device for testing heat pipe wick capillary on basis of quantum dots
  • Method and device for testing heat pipe wick capillary on basis of quantum dots
  • Method and device for testing heat pipe wick capillary on basis of quantum dots

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Based on the braided copper wire matrix with a diameter of 30 μm, chemical deposition-vacuum sintering is used to enhance its capillary capacity, and a liquid-absorbing core with a thickness of 0.5 mm, a width of 1.5 mm, a length of 100 mm, and a porosity of 50% is prepared; figure 1 The capillary capacity of the liquid-absorbent core prepared by the device test;

[0048] Using C quantum dots to prepare C quantum dot solution for photosensitive display, the mass concentration of C quantum dot solution is 1%; Utilize Japan Shimadzu fluorescence spectrophotometer RF-6000 to test C quantum dots, the excitation wavelength is 455nm; the emission spectrum is as follows figure 2 shown by figure 2 It can be seen that the emission wavelength is 451nm;

[0049] (1) The angle turntable 15 controls the rotating rod 14 to rotate at an angle of 0°; the C quantum dot solution is added to the container 3, and the height of the lifting platform 2 is adjusted so that the C quantum dot...

Embodiment 2

[0057] Based on copper powder with a diameter of 200 mesh, vacuum sintering is used to enhance its capillary capacity, and it is sintered at 900°C for 30 minutes to prepare a liquid-absorbing core with a thickness of 0.4mm, a width of 10mm, a length of 200mm, and a porosity of 80%. use figure 1 The capillary capacity of the liquid-absorbent core prepared by the device test;

[0058] The quantum dot solution used is a CdSe / ZnS quantum dot aqueous solution, and the mass concentration of the CdSe / ZnS quantum dot solution is 5%; the CdSe / ZnS quantum dot solution is tested with a Shimadzu fluorescence spectrophotometer RF-6000, and the excitation wavelength is 455nm; Spectrum such as image 3 shown by image 3 It can be seen that the emission wavelength is 549nm;

[0059] (1) The angle turntable 15 controls the rotating rod 14 to rotate at an angle of 60°; the CdSe / ZnS quantum dot solution is added to the container 3, and the height of the lifting platform 2 is adjusted so that ...

Embodiment 3

[0066] The difference from Example 1 is that the liquid-absorbing core used in this example is based on a copper wire matrix braided mesh with a diameter of 30um, and its capillary capacity is enhanced by chemical deposition-vacuum sintering. The thickness of the preparation is 0.5mm and the width is 1.5mm. mm, a length of 100mm, and a liquid-absorbent core with a porosity of 65%; the simulated rotation condition of the liquid-absorbent core 6 is 30°; the immersion depth of the liquid-absorbent core 6 is 1.75mm; the mass concentration of C quantum dots used is 3%; capillary test The time is 17min to collect relevant data.

[0067] From the obtained fluorescent image of C quantum dots, it is known that the C quantum dots on the copper wire mesh are excited to emit light obviously, the distribution of luminous intensity is relatively uniform, and there is no obvious dark area. A meniscus boundary that is high in the middle and low on both sides appears.

[0068] The camera 4 re...

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Abstract

The invention discloses a method and a device for testing the heat pipe wick capillary on the basis of quantum dots. The device comprises a support (1), a lifting table (2), a container (3), a camera (4), an ultraviolet lamp (5), a wick (6), a laser traction rod (7), a laser sleeve (8), a confocal laser probe (9), a darkroom baffle (10), ultraviolet light filtering glass (11), a wick fixing rack (12), a nut (13), a rotating rod (14), an angle rotating table (15), a darkroom box (16), a synchronous conveying belt fixing part (17), a synchronous conveying belt (18), a motor connecting body (19) and a motor (20). According to the method, a photoluminescence characterizing method based on the quantum dots is adopted, and weakness of the heat pipe wick capillary function is indirectly represented. The device is simple and high in accuracy. By means of the method, conventional fluorescent dyes cannot affect the thermophysical properties of working media, and the method is applicable to accurate measurement of the internal capillary of the heat pipe wick.

Description

technical field [0001] The invention relates to a method and a device for capillary testing of a heat pipe liquid-absorbing core, in particular to a method and a device for capillary testing of a heat pipe liquid-absorbing core based on quantum dots. Background technique [0002] With the rapid increase of chip heat flux in microelectronics and other fields and the emergence of limited heat dissipation area, heat pipes with high thermal conductivity have been paid attention to and widely used in aerospace, electronics, motors and many other fields. The working principle of the heat pipe is: the liquid working medium in the heat pipe is heated and vaporized into steam in the evaporating section, and the steam flows to the condensing section with a small pressure difference in a vacuum environment, and releases heat in the condensing section to condense into a liquid. The wick returns to the evaporation section. Among them, the capillary force plays a driving role in the retu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00G01N15/08G01N21/64
CPCG01N13/00G01N15/088G01N21/643
Inventor 汤勇梁观伟李宗涛王卉玉陈钧驰钟桂生袁伟
Owner SOUTH CHINA UNIV OF TECH
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