Suscripción a Biblioteca: Guest
Página principal de la Biblioteca Digital de IHTC Archivos Funcionarios Reuniones futuras Asamblea para las Conferencias Internacionales de Transferencia de Calor
International Heat Transfer Conference 13

ISBN Imprimir: 1-56700-226-9 (CD)
ISBN En Línea: 1-56700-225-0

MODELLING OF THE GROWTH AND DETACHMENT OF A VAPOUR BUBBLE AND THE EFFECT OF AN ELECTRIC FIELD IN THE NUCLEATE BOILING REGIME

DOI: 10.1615/IHTC13.p28.140
page 13

Khellil Sefiane
The University of Edinburgh, James Clerk Maxwell Building, Kings Buildings, School of Engineering, Edinburgh EH9 3FB, United Kingdom; Tianjin Key Lab of Refrigeration Technology, Tianjin University of Commerce, 300134

Y. Hristov
University of Edinburgh, Edinburgh, UK

D. B. R. Kenning
School of Engineering and Design, Brunel University, Uxbridge, West London, United Kingdom ; Department of Engineering Science Oxford University, Oxford, OX1 3PJ, UK

Tassos G. Karayiannis
Department of Mechanical and Aerospace Engineering Brunel University London, Uxbridge, UP8 3PH, UK

Debiao Zhao
Brunel University, London, UK

Sinopsis

A comprehensive model predicting the deformation, growth and detachment of a vapour bubble in the nucleate boiling regime with an applied electric field is described in this paper. The model takes into account the full electrohydrodynamics of the phenomenon including the influence of local temperature on the generation of free charges in the liquid. Solution of the model by the level set method has been successfully implemented with a commercial CFD code. Aspects of the code and the graphical software requiring further development are noted.
Sample results are presented to demonstrate the effect of the electric field on the growth and detachment of the bubble, for a bubble initially protruding through a thermal boundary layer on a horizontal wall. The bubble is elongated under the influence of electric forces, the effect being more pronounced for stronger electric fields. The electric field is found to promote earlier detachment of the bubble at a smaller volume, thus increasing the bubble frequency. The wall heat flux during the process of detachment is not much affected by the electric field.

IHTC-13 Digital Library

Measurement of fluid temperature with an arrangement of three thermocouples FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION