Study on dryout point in vertical narrow annuli

MISCELLANEOUS

Study on dryout point in vertical narrow annuli

TIAN Wen-Xi，

Myint AYE，

QIU Sui-Zheng，

JIA Dou-Nan

Nuclear Science and Techniques

Vol.16, No.1

pp.53-58

Published in print 01 Feb 2005

CLC：TL33,O359

43201

Prediction of dryout point is experimentally investigated with deionized water upflowing through narrow annular channel with 1.0 mm and 1.5 mm gap respectively. The annulus with narrow gap is bilaterally heated by AC current power supply. The experimental conditions covered a range of pressure from 0.8 to 3.5 MPa, mass flux of 26.6 to 68.8 kg•m^-2•s^-1 and wall heat flux of 5 to 50 kW•m^-2. The location of dryout is obtained by observing a sudden rise in surface temperature. Kutateladze correlation is cited and modified to predict the location of dryout and proved to be not a proper one. Considering in detail the effects of geometry of annuli, pressure, mass flux and heat flux on dryout, an empirical correction is finally developed to predict dryout point in narrow annular gap under low flow condition, which has a good agreement with experimental data.

Narrow annular channelBilaterally heatingDryout pointCritical qualityAnnular flow

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