Foam Flow Turn Influence On The In-line Tube
Bundle Heat Transfer Intensity
Author(s)
J. Gylys1, S. Sinkunas, T. Zdankus, V. Giedraitis & A. Balcius
Abstract
An experimental investigation of heat transfer from the tubes to the two-phase
foam system was performed. Statically stable gas–liquid foam flow was used as
a coolant. An investigation was performed on the experimental laboratory set-up
consisting of the foam generator, an experimental channel and tube bundles. Two
different geometries of in-line tube bundles were used for the experiments.
Regularities of heat transfer of the tube bundles to the foam flow under the 180°
degree turn were analysed in the work. The results of the investigation showed
that heat transfer intensity is much higher than that for the one-phase airflow
under the same conditions. The heat transfer character of frontal and further
tubes to downward foam flow is different in comparison with the one-phase
coolant flow. After the turn, local void fraction of the foam is less on the inner
side of the foam flow. Therefore heat transfer intensity of the inner side-line
tubes is higher than for other tubes of the bundle. The results of the investigation
were generalized by criterion equations, which can be used for the calculation
and design of the statically stable gas–liquid foam heat exchangers with the
in-line tube bundles.
Keywords: statically stable foam, foam flow, flow turn, heat transfer, in-line
tube bundle.
1 Introduction
One-phase coolants are usually used for heat and mass transfer processes in heat
exchangers. Smaller coolant mass flow rate, relatively large heat transfer rate,
low energy consumption required for coolant delivery to the heat transfer place
Keywords
statically stable foam, foam flow, flow turn, heat transfer, in-line
tube bundle.
Related Book
Other papers in this volume
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