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AURGMENTATION OF HEAT TRANSFER FROM A CYLINDER TO A PULSATING CROSS FLOW
Mikheev A.N., Mikheev N.I., Molochnikov V.M.
Research Centre for Power Engineering Problems, Kazan Scientific Centre (KNC) of RAS, Kazan, Russia
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Citation:
Mikheev, A.N., Mikheev, N.I. and Molochnikov, V.M., (2012) Aurgmentation of heat transfer from a cylinder to a pulsating cross flow, Modern Science: Researches, Ideas, Results, Technologies, Iss. #2(10), PP. 214 - 219.
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Keywords:pulsating flow; cylinder; near wake; vortical structure; heat transfer augmentation; mechanism; frequency |
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Abstracts:
Processes in a cross flow around a circular cylinder typical for tube heat exchangers are considered. The effect of superimposed periodic unsteadiness on heat transfer and flow structure in the near wake of the cylinder is studied. Flow visualization has been conducted; average heat transfer coefficient and distribution of local heat transfer coefficient over the cylinder surface have been estimated experimentally. Typical regimes of pulsating flow around the cylinder have been identified, among which there is a regime of full synchronization of vortex shedding frequency with the frequency of superimposed unsteadiness of the external flow. The mechanism of the influence of superimposed unsteadiness on vortex generation behind the cylinder has been described. The regimes corresponding to the maximum heat transfer from the cylinder surface to the pulsating flow have been determined. |
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References:
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