Heat Transfer From In-line Tube Bundles To
Downward Aqueous Foam Flow
Author(s)
J. Gylys, S. Sinkunas, T. Zdankus, R. Jonynas
& R. Maladauskas
Abstract
An experimental investigation of heat transfer from in-line tube bundle to foam
flow was performed. One type of aqueous foam – statically stable foam was used
as a coolant. The experimental setup consisted of the foam generator,
experimental channel, in-line tube bundle, measurement instrumentation and
auxiliary equipment. During the experiments aqueous foam initially moved
vertically upward, then made a 180 degree turning and moved vertically
downward crossing the in-line tube bundle. Three tube bundles with different
geometry were used for investigation. Spacing among the centres of the tubes
across the first in-line tube bundle was 0.03 m and spacing along the bundle was
0.03 m. In the second case spacing among the centres of the tubes across the
bundle was 0.03 m; spacing along the bundle was 0.06 m. In the last case
spacing was accordingly 0.06 m and 0.06 m. Initially, the first tube bundle was
installed at the experimental channel, next the second tube bundle was installed
instead of the previous bundle and so on. The laminar downward foam flow
crossed the tube bundle and the mean velocity of foam flow was changed from
0.14 m/s to 0.30 m/s. The volumetric void fraction of foam was changed from
0.996 to 0.998. During an experimental investigation it was determined
dependence of heat transfer intensity on flow parameters: flow velocity,
influence of tube position of the bundle on heat transfer intensity was
investigated.
Keywords: aqueous foam flow, flow turn, in-line tube bundle, void fraction of
foam.
Keywords
aqueous foam flow, flow turn, in-line tube bundle, void fraction of
foam
Related Book
Other papers in this volume
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