Experimental Study Of Momentum And
Heat Transfer In The Entrance Region Of
Vertical Film Flow
Author(s)
S. Sinkunas, J. Gylys, A. Kiela & I. Gimbutyte
Abstract
This paper reports the experimental research of fluid flow and heat transfer on
wetted surface of vertical tubes. In many engineering applications an estimation
of the entrance region is required. Therefore, the alteration of hydromechanic
parameters of liquid film in the entrance region was investigated. The detailed
description of experimental set-up is presented in the study. The method for the
shear stress measurement on wetted surface of a vertical tube was proposed.
Values of shear stress for the turbulent liquid film flow in the range of Reynolds
numbers from 103 to 105 were determined. It was noticed that shear stress close
to the liquid distributor depends upon the initial velocity of the film.
Experimental investigation of heat transfer in the entrance region for the
turbulent film was performed as well. The research has been carried out in water
film falling down a surface of a vertical tube as Reynolds number ranged from
3300 to 3800. The experimental results of local heat transfer variation are
discussed in the paper. Heat transfer stabilization length was established
experimentally. Evaluation of heat losses in the test section is presented.
Key words: film flow, heat transfer, entrance region, shear stress, vertical tube
turbulent film.
1 Introduction
Liquid films under gravity influence continue to attract the interest of many
researches. Film flows can be found in a variety of engineering applications, e.g.
adsorption columns, condensers, evaporators, boilers. Condensing and
Keywords
film flow, heat transfer, entrance region, shear stress, vertical tube
turbulent film.
Related Book
Other papers in this volume
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