Critical height of micro/nano structures for pool boiling heat transfer enhancement

被引：110
|
作者：
Zou, An [1 ]
Maroo, Shalabh C. [1 ]
机构：
[1] Syracuse Univ, Dept Mech & Aerosp Engn, Syracuse, NY 13244 USA
来源：
APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 22期
基金：
美国国家科学基金会;
关键词：
THIN LIQUID-FILMS; GEOMETRY; MODEL;
D O I：
10.1063/1.4833543
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Critical heat flux (CHF) enhancement by surface modifications has been an extensively researched area in pool boiling heat transfer. Here we report a fundamental mechanism of CHF enhancement where nano/micro ridges are fabricated on surfaces to fragment and evaporate the metastable non-evaporating/adsorbed film present at the base of a bubble in the contact line region. CHF increase of similar to 125% is obtained with only similar to 40% increase in surface area. An analytical model is extended to explain the CHF enhancement and to determine the average non-evaporating film thickness, which serves as the critical height for nano/micro structures for pool boiling heat transfer enhancement. (C) 2013 AIP Publishing LLC.
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页数：5
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