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International Heat Transfer Conference 7

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

UNCOVERED CORE HEAT TRANSFER AND THERMAL NON-EQUILIBRIUM

A. Annunziato
TERM - C.S.N. Casaccia - CNEN - Rome

Maurizio Cumo
ENEA, Rome; DINCE, University of Rome “La Sapienza”, Corso Vittorio Emanuele II, 244, Rome, Italy

G. Palazzi
Comitato Nazionale per L'Energia Nucleare, Roma, Italy

Abstract

TMI accident has risen the interest of safety nuclear engineers in a relatively new heat transfer condition in reactor core, i.e. a situation in which the coolant flowrate is so low that the liquid level may be below the active length of the core and a particular type of post dry-out heat transfer dominates the temperature regime in the uncovered region. Therefore, an experimental research has been performed employing a very simple loop with a particularly accurate test section instrumentation for the measure of coolant and wall temperatures. Critical qualities at the dry-out point and post dry-out heat transfer coefficients have been systematically measured and compared with the available correlations. Moreover post dry-out heat transfer has been investigated with particular focus on the entrained droplets population and a droplet size distribution law has been derived by means of the coolant temperature measurements.

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