Peculiarities Of Heat Transfer From In-line
Tube Bundles To Upward Aqueous Foam Flow
Author(s)
J. Gylys, S. Sinkunas, B. Sundén, I. Gabrielaitiene
& T. Zdankus
Abstract
Four in-line tube bundles with different geometry were investigated for
establishing their performance in terms of heat transfer enhancement. Two-phase
aqueous foam was used as a coolant. Such coolant was considered, because our
previous research showed that large heat transfer intensity may be reached even
at small mass flow rate of the foam. 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 third case
spacing was accordingly 0.06 and 0.03 and in the last case spacing was
accordingly 0.06 m and 0.06 m. During an experimental investigation it was
determined a dependence of heat transfer intensity on flow parameters. The
investigation of heat transfer from the bundle to upward vertical foam flow was
provided for three different values of foam volumetric void fractions
β=0.996÷0.998. The velocity of the foam flow was changed from 0.14 to
0.30 m/s. The heat transfer coefficient varied from 200 to 2000 W/(m2K) for the
above mentioned foam flow parameters.
Keywords: in-line tube bundle, aqueous foam, upward flow, heat transfer.
Keywords
in-line tube bundle, aqueous foam, upward flow, heat transfer.
Related Book
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