Effects of Superhydrophobic and Superhydrophilic Surfaces on Heat Transfer and Oscillating Motion of an Oscillating Heat PipeSource: Journal of Heat Transfer:;2014:;volume( 136 ):;issue: 008::page 82001DOI: 10.1115/1.4027390Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The effects of superhydrophobic surface and superhydrophobic and superhydrophilic hybrid surface on the fluid flow and heat transfer of oscillating heat pipes (OHPs) were investigated in the paper. The inner surfaces of the OHPs were hydrophilic surface (copper), hybrid surface (superhydrophilic evaporation and superhydrophobic condensation section), and uniform superhydrophobic surface, respectively. Deionized water was used as the working fluid. Experimental results showed that superhydrophobic surface influenced the slug motion and thermal performance of OHPs. Visualization results showed that the liquidvapor interface was concave in the OHP with copper surface. A thin liquid film existed between the vapor plug and the wall of the OHP. On the contrary, the liquidvapor interface took a convex profile in the OHP with superhydrophobic surface and the liquidvapor interface contact line length in the hybrid surface OHP was longer than that in the uniform superhydrophobic surface OHP. The liquid slug movements became stronger in the hybrid surface OHPs as opposed to the copper OHP, while the global heat transfer performance of the hybrid surface OHPs increased by 5–20%. Comparing with the copper OHPs, the maximum amplitude and velocity of the liquid slug movements in the hybrid surface OHPs increased by 0–127% and 0–185%, respectively. However, the maximum amplitude and velocity of the liquid slug movements in the uniform superhydrophobic OHPs was reduced by 0–100% and 0–100%, respectively. The partial dryout phenomenon took place in OHPs with uniform superhydrophobic surface. The liquid slug movements became weaker and the thermal resistance was increased by 10–35% in the superhydrophobic surface OHPs.
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contributor author | Hao, Tingting | |
contributor author | Ma, Xuehu | |
contributor author | Lan, Zhong | |
contributor author | Li, Nan | |
contributor author | Zhao, Yuzhe | |
date accessioned | 2017-05-09T01:09:36Z | |
date available | 2017-05-09T01:09:36Z | |
date issued | 2014 | |
identifier issn | 0022-1481 | |
identifier other | ht_136_08_082001.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/155344 | |
description abstract | The effects of superhydrophobic surface and superhydrophobic and superhydrophilic hybrid surface on the fluid flow and heat transfer of oscillating heat pipes (OHPs) were investigated in the paper. The inner surfaces of the OHPs were hydrophilic surface (copper), hybrid surface (superhydrophilic evaporation and superhydrophobic condensation section), and uniform superhydrophobic surface, respectively. Deionized water was used as the working fluid. Experimental results showed that superhydrophobic surface influenced the slug motion and thermal performance of OHPs. Visualization results showed that the liquidvapor interface was concave in the OHP with copper surface. A thin liquid film existed between the vapor plug and the wall of the OHP. On the contrary, the liquidvapor interface took a convex profile in the OHP with superhydrophobic surface and the liquidvapor interface contact line length in the hybrid surface OHP was longer than that in the uniform superhydrophobic surface OHP. The liquid slug movements became stronger in the hybrid surface OHPs as opposed to the copper OHP, while the global heat transfer performance of the hybrid surface OHPs increased by 5–20%. Comparing with the copper OHPs, the maximum amplitude and velocity of the liquid slug movements in the hybrid surface OHPs increased by 0–127% and 0–185%, respectively. However, the maximum amplitude and velocity of the liquid slug movements in the uniform superhydrophobic OHPs was reduced by 0–100% and 0–100%, respectively. The partial dryout phenomenon took place in OHPs with uniform superhydrophobic surface. The liquid slug movements became weaker and the thermal resistance was increased by 10–35% in the superhydrophobic surface OHPs. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Effects of Superhydrophobic and Superhydrophilic Surfaces on Heat Transfer and Oscillating Motion of an Oscillating Heat Pipe | |
type | Journal Paper | |
journal volume | 136 | |
journal issue | 8 | |
journal title | Journal of Heat Transfer | |
identifier doi | 10.1115/1.4027390 | |
journal fristpage | 82001 | |
journal lastpage | 82001 | |
identifier eissn | 1528-8943 | |
tree | Journal of Heat Transfer:;2014:;volume( 136 ):;issue: 008 | |
contenttype | Fulltext |