Heat Transfer Enhancement of Horizontal Oscillating Heat Pipes With Micro-/Nanostructured SurfaceSource: Journal of Heat Transfer:;2020:;volume( 142 ):;issue: 007::page 072001-1DOI: 10.1115/1.4047216Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: For oscillating heat pipes (OHPs) with low turn number (<9) positioned in the horizontal direction, the working fluid could not easily flow back to the evaporator due to the absence of gravity. Based on this, copper OHP with superhydrophilic micro-/nanostructured surface was investigated to enhance the heat transfer performance by introducing additional capillary force. OHPs with six turns were fabricated with bare copper and micro-/nanostructured inner surfaces for comparison. Pure water was used as the working fluid. Contact angles of water on the copper and superhydrophilic surfaces were 36.7 and 0 deg, respectively. The filling ratios of water were 50%, 65%, and 80%, respectively. Thermal resistance and liquid slug oscillations of OHPs were investigated at the heat input ranging from 100 to 380 W. Experimental results showed that OHPs with the superhydrophilic micro-/nanostructured surface showed an enhanced heat transfer performance due to the micro-/nanostructure-induced capillary flow in the horizontal direction. The optimum filling ratio was 65% in this work. The superhydrophilic micro-/nanostructured surface could significantly facilitate the backflow of the working fluid to the evaporator section and accelerate oscillating motions of liquid slugs. With the increasing of 0–70% in slug oscillating amplitude and 0–100% in slug oscillating velocity, micro-/nanostructured OHPs improved the heat transfer performance by up to 10% compared with the copper OHPs due to the wicking effect.
|
Collections
Show full item record
contributor author | Hao, Tingting | |
contributor author | Yu, Huiwen | |
contributor author | Ma, Xuehu | |
contributor author | Lan, Zhong | |
date accessioned | 2022-02-04T22:02:08Z | |
date available | 2022-02-04T22:02:08Z | |
date copyright | 5/29/2020 12:00:00 AM | |
date issued | 2020 | |
identifier issn | 0022-1481 | |
identifier other | ht_142_07_072001.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4274749 | |
description abstract | For oscillating heat pipes (OHPs) with low turn number (<9) positioned in the horizontal direction, the working fluid could not easily flow back to the evaporator due to the absence of gravity. Based on this, copper OHP with superhydrophilic micro-/nanostructured surface was investigated to enhance the heat transfer performance by introducing additional capillary force. OHPs with six turns were fabricated with bare copper and micro-/nanostructured inner surfaces for comparison. Pure water was used as the working fluid. Contact angles of water on the copper and superhydrophilic surfaces were 36.7 and 0 deg, respectively. The filling ratios of water were 50%, 65%, and 80%, respectively. Thermal resistance and liquid slug oscillations of OHPs were investigated at the heat input ranging from 100 to 380 W. Experimental results showed that OHPs with the superhydrophilic micro-/nanostructured surface showed an enhanced heat transfer performance due to the micro-/nanostructure-induced capillary flow in the horizontal direction. The optimum filling ratio was 65% in this work. The superhydrophilic micro-/nanostructured surface could significantly facilitate the backflow of the working fluid to the evaporator section and accelerate oscillating motions of liquid slugs. With the increasing of 0–70% in slug oscillating amplitude and 0–100% in slug oscillating velocity, micro-/nanostructured OHPs improved the heat transfer performance by up to 10% compared with the copper OHPs due to the wicking effect. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Heat Transfer Enhancement of Horizontal Oscillating Heat Pipes With Micro-/Nanostructured Surface | |
type | Journal Paper | |
journal volume | 142 | |
journal issue | 7 | |
journal title | Journal of Heat Transfer | |
identifier doi | 10.1115/1.4047216 | |
journal fristpage | 072001-1 | |
journal lastpage | 072001-8 | |
page | 8 | |
tree | Journal of Heat Transfer:;2020:;volume( 142 ):;issue: 007 | |
contenttype | Fulltext |