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International Heat Transfer Conference 7

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

HEAT TRANSFER TO PULSATING, TURBULENT GAS FLOW

J. S. Park
Aerospace and Mechanical Engineering Department, University of Arizona, Tucson, Arizona 85721 USA

M. F. Taylor
Aerospace and Mechanical Engineering Department University of Arizona, Tucson, Arizona 85721

Donald M. McEligot
Aerospace and Mechanical Engineering Department, University of Arizona,Tucson, AZ 85721; Idaho National Laboratory (INL), Idaho Falls, ID 83415-3885, USA; and Institut für Kernenergetik und Energiesysteme, Universitat Stuttgart, Stuttgart, Germany

DOI: 10.1615/IHTC7.1550
pages 105-110

Abstract

Measurements of heat transfer parameters in pulsating and steady forced turbulent air flow through a vertical, circular tube, which was re-sistively heated, are reported. Inlet Reynolds numbers varied from 19,000 to 102,000; Mach numbers were 0.15 or below; pulsation frequencies ranged from 2.1 to 3.6 Hz and the peak-to-peak pressure fluctuations varied from 9 to 29 percent of the mean pressure. At these conditions the non-dimensional frequency α = r √(2nf/ν), varied from about 4 to 7 1/2; in laminar flow, quasi-steady approximations become weak when this frequency becomes greater than about two, but for turbulent heat transfer in this Reynolds number range the limitations are still to be determined. Direct comparison between steady and pulsating runs at the same values of the control parameters essentially confirmed quasi-steady predictions for Re> 5 × 104.

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