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research-article

EFFECT OF SURFACE ROUGHNESS ON POOL BOILING HEAT TRANSFER OF WATER ON A SUPERHYDROPHILIC ALUMINUM SURFACE

[+] Author and Article Information
Jinsub Kim

Extreme Mechanical Engineering Research Division, Korea Institute of Machinery and Materials 156 Gajeongbuk-Ro, Yuseong-Gu, Daejeon, 34103, Korea
jskim129@kimm.re.kr

Seongchul Jun

Mechanical Engineering Department, University of Texas at Dallas 800 W. Campbell Rd., Richardson, Texas 75080, USA
sxj142030@utdallas.edu

Jungho Lee

Extreme Mechanical Engineering Research Division, Korea Institute of Machinery and Materials 156 Gajeongbuk-Ro, Yuseong-Gu, Daejeon, 34103, Korea
jungho@kimm.re.kr

Juan C. Godinez

Mechanical Engineering Department, University of Texas at Dallas 800 W. Campbell Rd., Richardson, Texas 75080, USA
jxg129530@utdallas.edu

Seung M. You

Mechanical Engineering Department, University of Texas at Dallas 800 W. Campbell Rd., Richardson, Texas 75080, USA
you@utdallas.edu

1Corresponding author.

ASME doi:10.1115/1.4036599 History: Received September 20, 2016; Revised April 19, 2017

Abstract

The effect of surface roughness on the pool boiling heat transfer of water was investigated on superhydrophilic aluminum surfaces. The formation of nanoscale protrusions on the aluminum surface was confirmed after immersing it in boiling water, which modified surface wettability to form a superhydrophilic surface. The effect of surface roughness was examined at different average roughness (Ra) values ranging from 0.11-2.93 µm. The boiling heat transfer coefficients increased with an increase in roughness owing to the increased number of cavities. However, the superhydrophilic aluminum surfaces exhibited degradation of the heat transfer coefficients when compared with copper surfaces owing to the flooding of promising cavities. The superhydrophilic aluminum surfaces exhibited a higher critical heat flux (CHF) than the copper surfaces. The CHF was 1,650 kW/m2 for Ra = 0.11 µm, and it increased to 2,150 kW/m2 for Ra = 0.35 µm. Surface roughness is considered to affect CHF as it improves the capillary wicking on the superhydrophilic surface. However, further increase in surface roughness above 0.35 µm did not augment the CHF, even at Ra = 2.93 µm. This upper limit of the CHF appears to result from the hydrodynamic limit on the superhydrophilic surface, because the roughest surface with Ra = 2.93 µm still showed a faster liquid spreading speed.

Copyright (c) 2017 by ASME
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