Visualization of a principle mechanism of critical heat flux in pool boiling

被引：28
作者：
Bang, IC
Chang, SH
Baek, WP
机构：
[1] Korea Adv Inst Sci & Technol, Taejon 305701, South Korea
[2] Korea Atom Energy Res Inst, Taejon 305353, South Korea
来源：
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2005年 / 48卷 / 25-26期
关键词：
liquid film; macrolayer; critical heat flux; boiling; visualization;
D O I：
10.1016/j.ijheatmasstransfer.2005.07.006
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A new experimental work was made to discover a principle mechanism of the burnout in pool boiling. Here, we directly observed a liquid layer structure under a massive vapor clot and the liquid layer-related burnout phenomenon. Based on the present observations, we have made a visual model for the formation and dryout of a liquid film under its vapor environment. At the formation process, liquid is trapped in interleaved space between growing bubbles and surface and the liquid trapping continues between coalesced bubbles and surface. In the dryout process, we especially observed vapor "holes" made by spontaneous breakup of discrete nucleating bubbles inside a vapor clot. The burnout can be triggered by the evaporation of the liquid film region expanded from rims of the holes. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码：5371 / 5385
页数：15
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