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Heat Transfer Enhancement Due to Flow Pulsation at Various Frequencies

[+] Author Affiliations
Mir-Akbar Hessami, Nurin Wahida Zulkifli

Monash University, Clayton, VIC, Australia

Paper No. IMECE2009-10274, pp. 1019-1027; 9 pages
doi:10.1115/IMECE2009-10274
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

This paper reports on the results of an experimental investigation of the effects of flow pulsation on heat transfer in a horizontal pipe. For this purpose, solenoid valves and a frequency generator were used to pulse water back and forth through a heated horizontal stainless steel pipe with an internal diameter of 11.6mm. Pulsation frequencies from 0.025 to 1.0Hz for various flow rates in the range 7,000<Re<70,000 were investigated. Pulsation amplitude was regularly adjusted in order to create a “reverse flow” condition. All experiments were carried out for the case of a non-zero net flow through the pipe. For the case of f = 0.25Hz and nearly all flow rates, up to 200% heat transfer enhancement compared to steady flow was obtained. For f <0.05Hz as well as for f >0.7Hz some reduction in heat transfer compared to steady flow was measured. A graph of heat transfer data for all pulsating flows vs Womersley number (Wo) showed that the optimum Wo which produces the highest heat transfer for this study was about 10. Other studies in the published literature also have reported an optimum Wo but its value appear to depend on the fluid properties and the hardware used in various studies.

Copyright © 2009 by ASME

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