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Artikel
Active control of oscillatory thermocapillary convection
| Författare: |
Shiomi, J., Amberg, G.A., Alfredsson, P.H. |
| Dokumenttyp: |
Artikel |
| Tillstånd: |
Publicerad |
| Tidskrift: |
Phys. Rev. E. |
| Volym: |
64
031205 |
| År: |
2001 |
AbstractActive control of oscillatory thermocapillary flow was applied in an open cylindrical container filled with silicon 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.
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