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ISSN Печать: 1065-5131
ISSN Онлайн: 1563-5074
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Augmenting the Heat Transfer by Turbulating Plane Channel Flows in the Low Range of the Reynolds Number
Краткое описание
We represent an experimental study of fluid dynamic and heat transfer behaviour in plane channels at Re below 2000. The experimental study considered different turbulators as a means of augmenting the fluid-wall heat transfer. It included flat grid or fins placed in mide-channel, corrugated nets and cylinders in distant in-line and staggered arrangements.
Turbulence parameters in the channel with the grid were measured. Turbulence intensity was up to 20% and over at some locations. The influence of turbulator parameters on the critical Re number value and on some turbulence parameters was determined.
Hydraulic drag and heat transfer similarity equations for channels with turbulators of all types were compiled. Corrugated nets were most effective, they increased Nu by a factor up to 3.5 and more. General principles for the heat transfer augmentation by the means of effective turbulation at the low range of Re were formulated. The results are intended for design calculations of modern, efficient heat exchangers, as well as for evaporation coolers and heat-recovery units.
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