A prolate spheroid submerged in water can be heated for decreasing the viscous drag because of a decrease in viscosity with increasing temperature. The heated boundary layer experiment, based on this principle, was carried out in a circulating water channel of NCKU, and the viscous drag of a spheroid, with a five-to-one ratio of length to mid-diameter, was also measured by means of wake surveys. The difference of total-head between wake and undisturbed region was measured by two total-head tubes, and the water speed in the wake area was measured by an electromagnetic flowmeter.
Experiments in Fluids – Springer Journals
Published: Dec 10, 1997
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