Title

Forced Convection Film Boiling Drag And Heat Transfer Of A Wedge

Abstract

Laminar forced convection film boiling flow on a wedge is analyzed considering the stream wise pressure gradient imposed on the flow and the stream wise buoyancy force (important because of the large density difference between the vapor and liquid) acting on the vapor film. A two-phase boundary layer model is proposed, and the local similarity concept is applied to obtain an approximate solution of the governing equations. Parametric trends in this analysis show that, for a water-steam system at atmospheric pressure considered within this study, the density difference between the vapor and liquid is large enough. As a result, both the stream-wise pressure gradient and the buoyancy force exert strong influence on the vapor flow dynamics. Wall skin friction results display a strong dependency on the stream wise buoyancy force driving the vapor film and the external pressure gradient. Previously observed “skin friction bucket” type phenomena with increased heating of the wedge are possible when the buoyancy force is small or negligible. Adverse stream wise buoyancy force acting on the vapor film, which is the case on the lower surface of a horizontally aligned wedge, may cause vapor flow separation. In contrast to wall skin friction dependency, the wall heat-transfer parameter shows a secondary dependence on the stream wise pressure gradient and the buoyancy force.

Publication Date

1-1-1990

Publication Title

AIAA/ASME 5th Joint Thermophysics and Heat Transfer Conference, 1990

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

85006893036 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85006893036

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