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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

TRANSITION OF CONVECTION MODE NEAR THE FREE SURFACE OF ROTATING LIQUID PRODUCED BY LASER BEAM PROJECTION

Get access (open in a dialog) DOI: 10.1615/IHTC9.2200
pages 359-364

Abstract

The experiment was conducted with silicone oil contained in a concentric rotating annulus where temperature differences (ΔT) were imposed between the outer and inner walls. Non-axisymmetric convection patterns were observed in certain ranges of ΔT and the rotation rate. Then, the conversion of those non-axisymmetric modes to axisymmetric modes was attempted by projecting a 10W C02 laser beam on a spot near the inner (cooler) wall. Measurements of liquid temperature were also conducted to find the effectiveness of laser beam projection in suppression of the temperature fluctuation near the liquid free surface. The method is yet inconclusive in control of the convection and concomitant calming of the temperature field, however, there are indications that in certain circumstances the beam projection can moderate non-axisymmetric convection, thereby yielding an appreciable reduction in the temperature fluctuation.