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Velocity Measurements with a New Probe in Inhomogeneous Turbulent Jets

Tombach, I. H. and Coles, D. (1971) Velocity Measurements with a New Probe in Inhomogeneous Turbulent Jets. Bulletin of the American Physical Society, 16 (11). p. 1324. ISSN 0003-0503.

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A velocity measuring probe, which creates "spots" of heat in a fluid flow by means of a pulsed heated wire and then senses the rate at which they are convected past a sensing wire, has been used to measure velocity profiles in subsonic, inhomogeneous, axisymmetric turbulent jets. In such flows the detected thermal profile of a spot is highly distorted, but reconstruction of a mean profile, by digital computer, from several hundred spots enables calculation of a mean velocity and a turbulence level. The measurements indicate that a jet which is less dense than the quiescent ambient fluid mixes with it more vigorously than a similar ambient density jet with the same nozzle Reynolds number. This is manifested by the higher turbulence levels, more rapid growth, and faster decay of the mean velocity of the less dense jet compared to the homogeneous one. A jet of denser-than-ambient fluid demonstrates the opposite behavior.

Item Type:Article
Additional Information:© 1971 American Institute of Physics. Work was supported by the Office of Naval Research.
Funding AgencyGrant Number
Office of Naval Research (ONR)UNSPECIFIED
Issue or Number:11
Record Number:CaltechAUTHORS:20130510-134022735
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38428
Deposited By: Tony Diaz
Deposited On:10 May 2013 22:29
Last Modified:03 Oct 2019 04:57

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