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Active control of a global thermocapillary instability
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0003-3336-1462
2002 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 14, no 9, 3039-3045 p.Article in journal (Refereed) Published
Abstract [en]

Active control was applied to oscillatory thermocapillary flow in an open cylindrical container filled with Silicone oil. Thermocapillary convection was driven by imposing a radial temperature gradient on a flat free surface. This is an extension of the previous work by Shiomi who applied proportional feedback control by locally heating the surface at a single position using the local temperature signal at a different position fed back through a simple algorithm. Although significant attenuation of the oscillation was detected, an uncertainty remained if global stabilization was achieved. In the present paper, two sensor/heater pairs were installed to achieve the global suppression of the oscillation. Successful global stabilization of the oscillation was achieved in a range of Marangoni number, with the best performance in the weakly nonlinear regime. Using a reliable temperature measurement method, quantitative analysis is carried out to quantify the performance of the control. The optimal values of gain and relative position of sensor/heater pairs were identified.

Place, publisher, year, edition, pages
2002. Vol. 14, no 9, 3039-3045 p.
Keyword [en]
no-motion state, cylindrical containers, nonlinear control, convection, stabilization, buoyancy
URN: urn:nbn:se:kth:diva-21802ISI: 000177350100011OAI: diva2:340500
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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