Critical height of micro/nano structures for pool boiling heat transfer enhancement
Critical height of micro/nano structures for pool boiling heat transfer enhancement
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DOI：
10.1063/1.4833543
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发表时间：
2013-11-25
影响因子：
4
通讯作者：
Maroo, Shalabh C.
中科院分区：
文献类型：
--
作者：
Zou, An;Maroo, Shalabh C.
表面改性提高临界热流密度一直是池沸腾换热领域的研究热点。在这里，我们报道了CHF增强的基本机制，即在表面上制造纳米/微米脊，以破碎和蒸发存在于接触线区域气泡底部的亚稳态非蒸发/吸附薄膜。在比表面积仅增加40%的情况下，获得了接近125%的CHF增加。扩展了一个解析模型来解释CHF强化，并确定了作为纳/微结构强化池沸腾换热的临界高度的平均非蒸发膜厚。(C)2013 AIP出版有限责任公司。
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.