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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

THEORETICAL CONSIDERATIONS ON THE BOILING CRISIS IN BOILING SYSTEMS UNDER HIGH HEAT FLUX CONDITIONS

Get access (open in a dialog) DOI: 10.1615/IHTC8.770
pages 2191-2195

Resumo

This paper presents the study of a sodium-heated evaporator consisting of two concentric tubes. It was carried out using a numerical continuation method. The plain model used to depict the evaporator operation is based on the homogeneous model and takes axial conduction into account. The local heat transfer properties of the two-phase flow are represented by a network of isoquality boiling curves.

The method used consists in determining how, under steady-state conditions, the longitudinal distributions of the temperature in the heating wall and sodium as well as of the quality change when the sodium inlet temperature is made to vary.

This study is performed, among others, to verify the validity of the thermal stability criterion, to analyze the conditions under which the dry-out front forms, to reveal the existence of multiple states and of hysteresis effects and, finally, to show the influence of the heating system characteristics on the evaporator thermal behaviour.