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Experimental and numerical investigation of nonlinear thermocapillary oscillations in an annular geometry
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0003-3336-1462
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0002-1146-3241
2001 (English)In: European journal of mechanics. B, Fluids, ISSN 0997-7546, E-ISSN 1873-7390, Vol. 20, no 6, 771-797 p.Article in journal (Refereed) Published
Abstract [en]

The present work investigates thermocapillary flow in a cylindrical configuration using large Prandtl number liquids. The flow is studied using coordinated simulations and experimental optical methods such as PIV and flow visualization. In this way, properties of the oscillatory state can be obtained in great detail. Considerable attention is given to the search for the parameters influencing the onset of the instability. It is found that the onset of oscillations can be correlated using a thermocapillary Reynolds number. The oscillations take the form of a standing wave close to the onset, which is replaced by a travelling wave for stronger forcing. The selection of azimuthal wave number of the oscillatory mode is determined from geometrical parameters, and resembles the wave number selection in vortex ring instabilities. Throughout we obtain good agreement between experiments and simulations using a mathematical model with an undeformed adiabatic free surface.

Place, publisher, year, edition, pages
2001. Vol. 20, no 6, 771-797 p.
Keyword [en]
thermocapillar, surface-tension, convection, stability, DNS, PIV, cylindrical liquid bridges, tension driven convection, crystal-growth process, instability mechanisms, marangoni convection, surface, layers, microgravity, flow, zone
URN: urn:nbn:se:kth:diva-21135ISI: 000172443500002OAI: diva2:339832
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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