Simultaneous measurement of void fraction and fundamental bubble parameters in subcooled flow boiling

被引：48

作者：

Okawa, Tomio ^{[1
]}

Kubota, Hayato ^{[1
]}

Ishida, Tatsuhiro ^{[1
]}

机构：

[1] Osaka Univ, Dept Engn Mech, Suita, Osaka 5650871, Japan

来源：

NUCLEAR ENGINEERING AND DESIGN | 2007年 / 237卷 / 10期

关键词：

D O I：

10.1016/j.nucengdes.2006.12.010

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Visualization was performed for the vapor bubbles in water subcooled flow boiling in a vertical heated tube to measure simultaneously the void fraction and the four fundamental bubble parameters: nucleation site density, bubble release frequency, bubble lifetime and bubble size. Using the mass flowrate and liquid subcooling as the experimental parameters, the changes of void fraction and bubble parameters with the wall heat flux were measured. The results of image analysis showed that the vapor void fraction could be approximated by the function of nucleation site density and bubble lift-off diameter; the bubble lift-off diameter was more influential than the nucleation site density. It was hence concluded that the bubble lift-off diameter could be regarded as the key parameter to determine the vapor void fraction under the present experimental conditions. The strong relation of bubble lift-off diameter to superheated liquid layer thickness was indicated for the future model development studies of bubble lift-off diameter. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：1016 / 1024

页数：9

共 37 条

[1] Onset of nucleate boiling and active nucleation site density during subcooled flow boiling [J].