Résumé du preprint DAPNIA/STCM/01-07

Heat and Mass Transfer in Two-Phase He I Thermosiphon Flow
B. Baudouy
Experimental results on two-phase He I natural convection flow, i.e. thermosiphon
open flow, for a vertical copper tube (14 mm inner diameter) uniformly heated over
a length of 1.2 m are presented. Maximum total mass flow rate of 22 g/s and exiting
vapor quality factor of 0.2 have been achieved in the steady state regime for a heat
flux up to 2000 W/m near atmospheric pressure. In addition, wall temperature difference
are measured and critical heat flux and heat transfer coefficients are presented as a
function of heat flux. In the nucleate boiling regime, heat transfert coefficient
correlations, based on the Martinelli parameter, are proposed for different tube height.
They described the data within 20% error margin in the range of 2 1.e5 Reynolds number.


Retour en haut