摘要：It is traditionally accepted that the critical heat flux (CHF) decreases with increasing nucleation site density (NSD). However, such a CHF-NSD relation was no longer observed in the BETA-B experiment performed on nano-film heaters; instead the increase of NSD resulted in a gain in CHF. To address this seeming contradiction in the relation between critical heat flux and nucleation site density, the present work employed probabilistic analysis to reveal the different tendencies. A concept of effective NSD was proposed, which concerns the active nucleation sites appear within a bubble lifetime, and the resulting bubbles have the chance of direct interaction. We assumed that the boiling crisis on a heater surface is mainly induced by two mechanisms: dry spot expanding in isolated bubble regime for low-NSD surface, coalescence of dry spots under multiple bubbles in fully developed nucleate boiling regime for high-NSD surface, or a combination of the two in the transition regime for medium-NSD surface. Accordingly, we estimated the critical heat flux of each boiling regime at which the boiling crisis occurs. The result indicated that there is a threshold of nucleation site density below which the increase of NSD is contributing to CHF enhancement, while the trend is inverted beyond the threshold.

关键字：DRY-SPOT MODEL CRISIS PHENOMENON BUBBLE DYNAMICS VISUALIZATION SURFACE

ISSN号：0145-7632

卷、期、页：卷: 39 期: 17-18 页: 1498-1506

发表日期：2018-11-08

影响因子：1.235000

期刊分区（SCI为中科院分区）：四区

收录情况：SCIE（科学引文索引网络版）,ESI（基本科学指标数据库）,CPCI-S（科技会议录索引）,EI（工程索引）

发表期刊名称：Heat Transfer Engineering

参与作者：龚圣捷,白博峰,马卫民

第一作者：王科

论文类型：期刊论文

论文概要：王科,龚圣捷,白博峰,马卫民，On the Relation between Nucleation Site Density and Critical Heat Flux of Pool Boiling，Heat Transfer Engineering，2018，卷: 39 期: 17-18 页: 1498-1506

论文题目：On the Relation between Nucleation Site Density and Critical Heat Flux of Pool Boiling