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Displacing small particles by unsteady temperature fields

Published online by Cambridge University Press:  10 May 2005

EHUD YARIV
EHUD YARIV
Affiliation:
Faculty of Mechanical Engineering, Technion – Israel Institute of Technology, Haifa 32000, Israel
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Abstract

A model for particle propulsion by an instantaneous heat discharge is presented. The flow is driven by a gravity-independent transient fluid dilatation, engendered by an unsteady temperature field which corresponds to heat emission from a localized source located within the particle. We focus on the highly eccentric case, where the heat is released in proximity to the particle surface. Solution of the Stokes equations and subsequent evaluation of the resulting hydrodynamic thrust yields a nonlinear non-autonomous ordinary differential equation governing the evolution of particle position with time. This equation depends upon a single parameter which represents the relative effects of heating magnitude and initial geometry.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 530 , 10 May 2005 , pp. 125 - 134
Copyright
© 2005 Cambridge University Press

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