التفاصيل البيبلوغرافية
| العنوان: |
Surface treatment of an applied novel all-diamond microchannel heat sink for heat transfer performance enhancement. |
| المؤلفون: |
Qi, Zhina1 (AUTHOR), Zheng, Yuting1 (AUTHOR), Wei, Junjun1 (AUTHOR) weijj@ustb.edu.cn, Yu, Xingang2 (AUTHOR), Jia, Xin1 (AUTHOR), Liu, Jinlong1 (AUTHOR), Chen, Liangxian1 (AUTHOR), Miao, Jianyin2 (AUTHOR), Li, Chengming1 (AUTHOR) chengmli@mater.ustb.edu.cn |
| المصدر: |
Applied Thermal Engineering. Aug2020, Vol. 177, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
HEAT transfer, SURFACE preparation, ATMOSPHERIC pressure, HEAT sinks, HEAT transfer coefficient, THERMAL resistance, DIAMONDS |
| مستخلص: |
• An applied AD-MCHS was processed on an ultra-thick CVD diamond plate. • The extra pressure-drop of merely <5% at large Reynolds number was negligible. • 20–50% increase of HTC was realized after surface hydrophilization. • 14–28% reduction of thermal resistance was obtained by surface modification. • The minimum thermal resistance of 0.28 °C/W can be obtained. • The maximum temperature-drop of 11.49℃ of heat source surface was achieved. Diamond with superior thermal conductivity would effectively unlock the heat dissipation problem, while the all-diamond microchannel heat sink (AD-MCHS) is immature. In the present work, surface modification of an applied novel AD-MCHS for heat transfer enhancement associate with single-phase (deionized water) coolant was elucidated, for the first time, on an ultra-thick free-standing chemical vapor deposition (CVD) diamond plate. The heat transfer performance of as-processed and post-treated AD-MCHS by surface oxygen-introduction were systematically studied under three heat flux levels, i.e., 40 W/cm2, 80 W/cm2 and 120 W/cm2, respectively. The results demonstrated that the heat transfer performance of the AD-MCHS after acid post-treatment (which was a preferable manner comparing with oxygen plasma and H 2 O 2 bath) was prominently enhanced: 20–50% improvement of heat transfer coefficient (to the maximum of 11917 W/m2·K), 14–28% reduction of thermal resistance and minimum thermal resistance of 0.28 °C/W as well as maximum temperature drop of 11.49 °C for heat source surface. These were the results of hydrophilic diamond surface associated with stronger surface interaction with water molecules, resulting from the reconstructed surface polar carbon-oxygen components, removal of surface graphitic phases as well as the accompanying temperate rising of surface roughness. And the heat transfer acting a more important factor would be enhanced at the expense of acceptable steadily increasing pressure drop (about 1 kPa) and negligible extra of merely <5% with the rising of Reynolds number. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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