Library Subscription: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

HEAT TRANSFER AND FLUID FLOW IN AN EVAPORATING EXTENDED MENISCUS

Get access (open in a dialog) DOI: 10.1615/IHTC9.3820
pages 229-234

Abstract

The rate of evaporation from a steady extended meniscus formed between the exits of two facing slot feeders is analyzed. The meniscus is symmetric about the centerplane. The physicochemical phenomena associated with cohesion and adhesion at interfaces are used to formulate transport equations unique to evaporating thin films which are then numerically solved for two types of menisci. One type involves an adsorbed thin film dominated by disjoining pressure effects, a thicker portion dominated by capillary effects and a transition region between. The second type has no thin film portion: the transition region straddles the plane of symmetry. In a sample calculation the heat flux is found to be roughly nine times higher for the latter type of meniscus. For the conditions studied, we find that a smaller value of the Hamaker constant (weaker adsorption) leads to an increase in the relative importance of capillarity and to a higher evaporation rate.