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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

PREDICTION OF LIQUID FILM COOLING IN PRESENCE OF WALL HEAT FLUX

Get access (open in a dialog) DOI: 10.1615/IHTC8.2220
pages 1291-1295

Résumé

A prediction procedure for film cooling using a sub-cooled liquid is described. This takes into account the vaporisation of the injected film as a result of heat transfer from the hot gases, the shearing forces as well as the heat transfer through the wall. The method solves the conservation equations for mass, momentum, species and enthalpy for the gaseous phase within the framework of a 2-D turbulent flow approximation and those for the liquid phase through a 1-D laminar flow formulation, with appropriate matching at the gas-liquid interface. A mixing length formulation is used for modelling the turbulent diffusion phenomenon. The method provides a solution for the flow and thermal fields, both in the region where the liquid exists as a sub-cooled film or is completely vaporised. The extent of region where boiling occurs in the film is treated in a simplified manner. Results for an air-water system with arbitrary wall heat flux are presented.