Stabilization Of Heat Transfer In
A Turbulent Film Flow
Author(s)
S. Sinkunas, J. Gylys & A. Kiela
Abstract
The aim of the present study is to clarify the tendencies of the heat transfer
developments in gravitational liquid film flow. Heat transfer in a turbulent film
flow on a vertical tube has been investigated in this paper. The analytical study
of stabilized heat transfer of turbulent film has been performed. The calculation
method for the local heat transfer coefficient of turbulent film falling down a
vertical convex surface is proposed. The analytical approach is used to establish
the dependence of heat flux variation on the distance from the wetted surface. An
experimental investigation of heat transfer in the entrance region of the turbulent
film has also been carried out. The methodology involves determining the local
heat transfer coefficient and establishing the transfer stabilization length. The
description of the experimental set-up and procedure is presented in this study.
The experiments have been performed in water film flowing down a surface of
vertical tube for Reynolds number ranged from 5850–6700. The results of
experiments are discussed with respect to the local heat transfer dependence on
the Reynolds number and initial velocity of the film in liquid distributor.
Key words: heat transfer, gravitational liquid film flow, turbulent film, entrance
region, vertical tube.
1 Introduction
A lot of industrial processes in chemical, environmental and power engineering
employ gravitational liquid film systems that are often designed using the heat
transfer phenomena in flows. The application of stabilized liquid film flow in
industrial apparatus is perspective from both economic and engineering aspects.
Keywords
heat transfer, gravitational liquid film flow, turbulent film, entrance
region, vertical tube.
Related Book
Other papers in this volume
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