Active control of oscillatory thermocapillary convection

Junichiro Shiomi, Gustav Amberg, and Henrik Alfredsson
Phys. Rev. E 64, 031205 – Published 30 August 2001
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Abstract

Active control of oscillatory thermocapillary flow was applied in an open cylindrical container filled with silicone oil. Thermocapillary convection was driven by imposing a radial temperature gradient on a flat free surface. The control was realized by locally heating the surface at a single position using the local temperature signal at a different position fed back through a simple algorithm. Significant attenuation of the oscillation was achieved in a wide range of supercritical Marangoni numbers, with the best performance in the weakly non-linear regime. Simultaneously measuring the temperature oscillation at two positions gives us a good insight in how the control influences the whole temperature field on the free surface. Quantitative analysis was done to characterize the optimal feedback amplification and the required power.

  • Received 4 November 2000

DOI:https://doi.org/10.1103/PhysRevE.64.031205

©2001 American Physical Society

Authors & Affiliations

Junichiro Shiomi, Gustav Amberg, and Henrik Alfredsson

  • Department of Mechanics, Royal Institute of Technology (KTH), S-100 44 Stockholm, Sweden

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Issue

Vol. 64, Iss. 3 — September 2001

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