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Boiling 2000 Phenomena and Emerging Applications Volume 2

ISSN:
1-56700-148-3 (Print)

HEAT TRANSFER IN SUBCOOLED INVERTED ANNULAR FLOW FILM BOILING UNDER CONSTANT HEAT FLUX CONDITION

P. K. Sarma
Department of Mechanical Engineering College of Engineering, Andhra University Visakhapatnam 530 003 INDIA

T. Subrahmanyam
Dept. of Mechanical Engg College of Engineering Andhra University Visakhapatnam - India

K. Ramakrishna
Department of Mechanical Engineering, K. L. University, Guntur 522502, A.P., India

Arthur E. Bergles
Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York; University of Maryland, College Park, Maryland; Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

Abstract

This paper presents an analysis which happens to be an extension of the previous study (1999) of the authors on subcooled inverted annular flow film boiling. A physical model for constant heat flux condition at the wall of a vertical tube with vapour film at the periphery and liquid in the core region is considered in the analysis. Employing Levy's (1960) postulation a relationship between the system parameters and the dryness fraction is obtained and subsequently utilized in the development of the theory for inverted flow film boiling. Further, using Van Driest (1956) mixing length theory velocity and temperature profiles are evaluated to establish the local heat transfer coefficients. A correlation is proposed to predict the mean heat transfer coefficient for constant heat flux conditions of the tube wall.