On Heat Transfer Variation In Film Flow Related
With Surface Cross Curvature
Author(s)
S. Sinkunas, J. Gylys & A. Kiela
Abstract
This paper is concerned with heat transfer calculation in a liquid film falling
down a vertical surface. Heat transfer in laminar film flow is influenced by the
cross curvature of the wetted surface, heat flux on the film surface and boundary
conditions on the wetted wall. The analytical study evaluating the influence of
cross curvature on heat transfer in laminar film has been carried out. Equations
using correction factors for the calculation of heat transfer in laminar liquid film
with respect to the cross curvature for different boundary conditions were
established. An experimental investigation of heat transfer in the entrance region
of the turbulent film has also been performed. The description of the
experimental set-up is presented in the paper. The research has been carried out
on a water film flowing down a surface of vertical tube with the Reynolds
number ranging from 9.2·103 to 10.5·103. The results of experiments are
discussed with respect to the local heat transfer dependence on the Reynolds
number and initial velocity of the film. Heat transfer stabilization length was
determined experimentally.
Keywords: heat transfer, laminar film, cross curvature, correction factor,
turbulent film, entrance region.
1 Introduction
In many technological processes that deal with heat and mass transfer, gravity
driven liquid films are widely used. With liquid falling films one can obtain
comparatively high heat transfer coefficient. This approach is employed for
cooling and heating processes in chemical, food, pharmaceutical and other
Keywords
heat transfer, laminar film, cross curvature, correction factor,
turbulent film, entrance region.
Related Book
Other papers in this volume
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