Active control of oscillatory thermocapillary convection
2001 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1063-651X, E-ISSN 1095-3787, Vol. 6403, no 3, art. no.-31205 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2001. Vol. 6403, no 3, art. no.-31205 p.
liquid bridges, cylindrical containers, marangoni-convection, buoyancy convection, shallow layers, zone, instabilities, flows, steady
IdentifiersURN: urn:nbn:se:kth:diva-20955ISI: 000171136200015OAI: oai:DiVA.org:kth-20955DiVA: diva2:339652
QC 201005252010-08-102010-08-10Bibliographically approved