Effect of liquid physical properties variability on film thickness

Abstract

A model for research of stabilized laminar liquid film flow on an outside surface of vertical tube based on force equilibrium equations is presented in the paper. The calculations for water, compressor oil and fuel oil films at various values of relative cross curvature of the films and ratios of heat fluxes densities were carried out. A function allowing estimating nonisothermality effect on film thick-ness was established. It has been determined that film thickness variation depends on the variability of liquid physical properties. Theoretical analysis of film cross cur-vature and external heat exchange influence on liquid film thickness variation was performed as well.