HeII co-current two phase flow at high vapor velocities

被引：0

作者：

Rousset, B ^{[1
]}

Jager, B ^{[1
]}

di Muoio, E ^{[1
]}

Puech, L ^{[1
]}

Thibault, P ^{[1
]}

Vallcorba, R ^{[1
]}

van Weelderen, R ^{[1
]}

Wolf, PE ^{[1
]}

机构：

[1] DRFMC, SBT, CEAG, F-38054 Grenoble, France

来源：

ADVANCES IN CRYOGENIC ENGINEERING, VOL 47, PTS A AND B | 2002年 / 613卷

关键词：

D O I：

暂无

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In the framework of LHC studies, we have performed several experiments on Hell co-current two-phase flow. It was found that for high vapor velocities, the heat exchange capacity between the Hell flow and the pipe wall is significantly better than what can be accounted for by the liquid to wall interface of a stratified two-phase flow pattern. This seems to indicate a transition from a pure stratified two-phase flow into either a partially annular two-phase flow or a stratified two-phase flow including liquid droplets in the vapor flow or a combination of the two. In the last two cases, it is assumed that liquid droplets which get dispersed on the tube wall increase the wetted surface. A new facility has been designed to analyze this flow behavior. High sensitivity capacitive liquid level sensors(1) glued onto the inner wall of the pipe were used in order to detect a possible semi-annular flow pattern whereas light diffraction and scattering 2 were used to detect liquid droplets. Finally, in addition to a circumferential heat exchange box, local heat exchange boxes located at different azimuth positions are added. Description of this new facility, calibration of the local heat exchange boxes and first results are presented.

引用

页码：1311 / 1318

页数：8