Experimental Study Of Heat Transfer From
In-line Tube Bundles To Upward Foam Flow
Author(s)
J. Gylys, I. Gabrielaitiene, T. Zdankus, S. Sinkunas
& R. Maladauskas
Abstract
The heat transfer from the in-line tube bundle to the vertically upward directed
laminar aqueous foam flow was investigated by means of experimental set-up,
consisting of the foam generator, experimental channel, in-line tube bundle,
measurement instrumentation and auxiliary equipment. Two in-line tube bundles
with different geometries were used for the experiments. One bundle consisted
of three rows with six tubes in each. Spacing between centres of the tubes across
the experimental channel was s1=0.06 m and spacing along the channel was
s2=0.03 m. The second in-line tube bundle consisted of five vertical rows with
six tubes in each. Spacing between centres of the tubes was s1=s2=0.03 m. All
tubes had an external diameter of 0.02 m. Statically stable foam was used for
experiments. It was noticed that structure of foam varied while it passed the
bundle: bubbles changed their size, liquid drainage from the foam appeared.
Dependence of heat transfer intensity on flow velocity, volumetric void fraction
of foam and liquid drainage was determined and described by empirical
relationships. Moreover, density and the pattern of tubes location were estimated
in experiments and the development of the heat transfer computation method.
Keywords: two-phase foam flow, in-line tube bundle, heat transfer, void fraction
of foam.
1 Introduction
Development of heat exchangers with low consumption of primary energy
resources and the enhanced heat transfer rates is the aim of this work. This issue
Keywords
two-phase foam flow, in-line tube bundle, heat transfer, void fraction
of foam.
Related Book
Other papers in this volume
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