Microbubble Formation in Collapsing Process of a Single Vapor Bubble Injected in Subcooled Pool
Microbubble Formation in Collapsing Process of a Single Vapor Bubble Injected in Subcooled Pool
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DOI：
10.1115/interpack2009-89160
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
I. Ueno;Y. Hattori
中科院分区：
文献类型：
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作者：
I. Ueno;Y. Hattori
“微泡排放沸腾”（MEB）是在窄范围过冷条件下出现的一种现象，其热通量高于临界热通量（CHF），并伴随着微泡从受热表面排放。本文着重研究了微气泡的凝结过程，以了解微气泡的形成和释放过程的机理。为了简化一个复杂的沸腾过程，作者试图从沸腾现象中提取汽泡与过冷体之间的相互作用，即汽泡喷射到过冷液池中的生长和溃灭过程。汽泡由蒸汽发生系统产生，在一定过冷度下喷射到饱和蒸馏水中。过冷度在0 ~ 50 K之间变化。通过采用具有背光系统的帧速率高达50，000 fps的高速相机来检测蒸汽气泡行为的生长/塌陷。在本研究中，微气泡的排放过程以及蒸汽气泡侵入过冷块体的过程与细金属丝上的MEB中的过程进行了比较。
‘Microbubble emission boiling,’ known as MEB, is a phenomenon that emerges in a narrow range of subcooled condition with a higher heat flux than critical heat flux (CHF) accompanying with microbubble emission from the heated surface. The authors focus on the condensing process of vapor bubbles in order to comprehend the mechanism of the microbubble formation and emitting processes. In order to simplify a surely complex boiling process, the authors try to extract an interaction between the vapor bubble and the subcooled bulk in a boiling phenomenon, that is, growing and collapsing processes of a vapor bubble ejected to subcooled liquid bath. Vapor bubble is produced by vapor generate system, and ejected to a bulk of saturated distilled water at a designated degree of subcooling. The degree of subcooling is varied from 0 to 50 K. The growing/collapsing of vapor bubble behavior is detected by employing a high-speed camera at frame rates up to 50,000 fps with a back-lighting system. In the present study, the process of microbubble emission as well as the process of the irrupting vapor bubbles to the subcooled bulk is compared to that in a MEB on a thin wire.Copyright © 2009 by ASME