The effects of interlaced wettability on pool boiling heat transfer
Date Issued
2014
Date
2014
Author(s)
Chiu, Wang-Chun
Abstract
This study investigates the effect of interlaced wettability surfaces on pool boiling heat transfer. Interlaced wettability surfaces are composed of two different wettability. This study uses sol-gel method to modify the surface wettability, and successfully generate from superhydrophilic-plain interlaced surface to superhydrophobic-plain surface. Experiment results are divided into three parts to examine the effect of three variables, contact angle difference, the wettability of central region and area ratio of the hydrophilic region.
At first, experimental results of contact angle difference show that all of the interlaced surfaces increase the critical heat flux and reduce the maximum superheat. The pool boiling curve shows that the heat flux increases with reduced wall superheat at nucleate boiling regime. Such a reverse trend on pool boiling curve could be explained by the flow visualization.
Furthermore, the results of the wettability of central region on the surfaces show that whatever the number of interfaces is, surfaces with plain central region have better boiling heat transfer than the others. Additionally, the higher pool boiling heat transfer can be observed when surfaces increase the number of interfaces. Finally, the results indicate that the best heat transfer coefficient is at 50% area ratio of the hydrophilic coated region.
Subjects
池沸騰
臨界熱通量
潤濕性
沸騰熱傳係數
Type
thesis
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