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Particle velocimetry in high-gradient/high-curvature flows

Bergthorson, J. M. and Dimotakis, P. E. (2006) Particle velocimetry in high-gradient/high-curvature flows. Experiments in Fluids, 41 (2). pp. 255-263. ISSN 0723-4864.

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Particle-velocimetry techniques typically rely on the assumption that particle velocities match fluid velocities. However, this assumption may be invalid if external forces or inertia cause the particle motion to differ from that of the flow. In this paper, particle motion through premixed stagnation flames is modeled, including Stokes-drag and thermophoretic forces. The finite time interval employed in particle-tracking techniques can act as a low-pass filter in flow regions with large curvature in the velocity field. To account for this effect, the modeled-particle-tracking profile for a specified time interval is estimated from the predicted particle position in time and compared to measurements. The implementation presented here is applicable to other simulated flow fields and allows direct comparisons with particle-velocimetry measurements. Expressions are also derived that allow particle-tracking data to be corrected for these effects.

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Additional Information:© 2006 Springer-Verlag. Received: 4 November 2005; Revised: 10 February 2006; Accepted: 27 February 2006; Published online: 5 May 2006. We would like to acknowledge discussions with L. Benezech, and assistance by D. Lang and G. Katzenstein with the experiments, and D. Goodwin with the Cantera software package. This work was funded by AFOSR Grant F49620-01-1-0006, whose support is gratefully acknowledged.
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Air Force Office of Scientific Research (AFOSR)F49620-01-1-0006
Issue or Number:2
Record Number:CaltechAUTHORS:20110119-112708491
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21814
Deposited By: Jason Perez
Deposited On:19 Jan 2011 23:55
Last Modified:03 Oct 2019 02:30

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