Experimental Investigation Of The Heat Transfer
Process Between A Tube Bundle
And An Upward Aqueous Foam Flow
Author(s)
J. Gylys, T. Zdankus, S. Sinkunas, M. Babilas & R. Jonynas
Abstract
High heat transfer intensity and low energy consumption for coolant
transportation to heat transfer location are really significant nowadays. An
extended range of heat transfer intensity control (control of volumetric void
fraction and flow rate of coolant) and low mass flow rate of coolant are one of
the most important factors for heat exchangers. In some cases the usage of
aqueous foam as a coolant can solve all of the mentioned problems. Our previous
investigation showed that heat transfer between a heated tube and aqueous foam
flow is over five to ten times lower for the water coolant, but the density of foam
is more than one hundred times lower than that of water. When applying aqueous
foam as a coolant in practice, some cases are problematic. The reasons for this
are the variation of the structure and the characteristics of foam. Therefore, usage
of aqueous foam as a coolant needs to be narrowly explored. This work follows
our previous investigations. The tube bundle with a new arrangement of tubes
was used in this research work. Spacing between the centres of the tubes in the
horizontal lines of the bundle and the spacing between tube lines were equal to
0.03 m. Each following line of tubes was located 0.01 m to the right of previous
line. During the experimental investigation the dependence of heat transfer
intensity (from tubes to foam flow) was determined on the volumetric void
fraction of foam and the foam flow velocity. The experiments were performed
for upward vertical foam flow for three different values of foam volumetric void
fractions equal to 0.996, 0.997 and 0.998. The velocity of the foam flow was
changed from 0.14 to 0.32 m/s. The influence of tube position in the bundle for
Keywords
tube bundle, aqueous foam, upward flow, heat transfer
Related Book
Other papers in this volume
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