Experimental research on dryout point of flow boiling in narrow annular channels

MISCELLANEOUS

Experimental research on dryout point of flow boiling in narrow annular channels

WU Ge-Ping，

QIU Sui-Zheng，

SU Guang-Hui，

JIA Dou-Nan，

LU Dong-Hua

Nuclear Science and Techniques

Vol.17, No.4

pp.252-256

Published in print 20 Aug 2006

DOI：10.1016/S1001-8042(06)60047-X

CLC：TL33,O359

44800

An experimental research on the dryout point of flow boiling in narrow annular channels under low mass flux with 1.55mm and 1.05mm annular gap, respectively, is conducted. Distilled water is used as working fluid and the range of pressure is limited within 2.0~4.0MPa and that of mass flux is 26.0~69.0kg·m^-2·s^-1. The relation of critical heat flux (CHF) and critical qualities with mass flux and pressure are revealed. It is found that the critical qualities decrease with the increasing mass flux and increase with the increasing inlet qualities in externally heated annuli. Under the same conditions, critical qualities in the outer tube are always larger than those in the inner tube. The appearance of dryout point in bilaterally heated narrow annuli can be judged according to the ratio of q_o/q_i.

Narrow annular channelFlow boilingDryout point

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