Premium
Spatial Velocity and Temperature Measurements in Non‐Isothermal Liquid Flows
Author(s) -
Heiland H. G.,
Wozniak G.
Publication year - 2004
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200410223
Subject(s) - marangoni effect , buoyancy , bubble , surface tension , mechanics , temperature gradient , convection , isothermal process , flow (mathematics) , maximum bubble pressure method , materials science , optics , thermodynamics , physics , meteorology
A surface tension driven flow in the liquid vicinity of an air bubble on a heated wall is studied experimentally. The liquid flow caused by the temperature gradient along the surface of the bubble is termed thermocapillary convection. The surface tension force and the buoyancy force oppose one another. The measurement technique is the 3D particle tracking velocity and thermometry, 3D PTV/T, using thermochromic liquid crystals and digital image processing. The paper describes the method in some detail and presents quantitative results for different Marangoni numbers. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)