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  • Stability of the oscillatory flow in liquid non-cylindrical liquid bridge

    Paper number

    IAC-05-A2.4.05

    Author

    Dr. Valentina Shevtsova, Université Libre de Bruxelles, Belgium

    Coauthor

    Prof. Jean Claude Legros, University of Brussels, Belgium

    Coauthor

    Dr. Alexander Myaldun, University of Brussels, Belgium

    Year

    2005

    Abstract

    The appearance and development of thermoconvective oscillatory flows are investigated experimentally with numerical support in a cylindrical column with a free lateral surface (so-called liquid bridge) filled with 5 and 10 cSt silicone oils. In this system a fluid volume is held by surface tension between two differentially heated horizontal flat co-axial disks. The convective flow is initiated by thermocapillary forces even for very small-applied temperature differences and evolves under the combined action of two effects; buoyancy and thermocapillarity. The experiments with high Prandtl number fluids were carried out under terrestrial conditions for a wide range of volumes of liquid bridges. The convective flow becomes oscillatory when the temperature difference increases and achieves certain critical value.

    Depending upon the volume of liquid between the rigid walls the column may have different shapes in normal gravity conditions; the relative volume of column (with respect to the cylindrical case) can vary from 0.7 until 1.3 depending upon aspect ratio and static Bond number. The characteristic capillary, hydrostatic and hydrodynamic pressures, and the viscous force per unit area control the free surface shape.

    It is found that periodic oscillatory convective flows are much more stable with respect to external disturbances in the case of under filled liquid zone, V<1, than in zone with V>1. The evolution of the various harmonics amplitudes, phase planes, return maps with increasing of applied temperature difference have been thoroughly analyzed.

    Abstract document

    IAC-05-A2.4.05.pdf

    Manuscript document

    IAC-05-A2.4.05.pdf (🔒 authorized access only).

    To get the manuscript, please contact IAF Secretariat.