Author(s)

J. Gylys & S. Sinkunas

Abstract

The procedure for the prediction of hydrodynamic parameters of laminar liquid film flowing down on the external surface of vertical tube is presented. An analytical study evaluating the influence of cross curvature on film thickness and shear stress distribution using curvature correction factor and correction coefficient is performed. Relations for the determination of correction parameters are also found. It is obtained that under the influence of convex surface curvature the film thickness and shear stress decrease changing local velocity distribution simultaneously. Applied prediction limits of curvature variation are presented. 1 Introduction Gravity fluid-film flows are exploited in a wide scope of industrial apparatus, as well as in cooling open heat-emitting surfaces, and

Keywords