Thermal Imaging Studies of the Laminar-Turbulent Transition in the Rayleigh-Benard Convection
V. S. Berdnikov1, V. A. Grishkov2, K. Y. Kovalevskii1, V. A. Markov2
1 Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences Novosibirsk State Technical University
2 Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences
berdnikov@itp.nsc.ru
Keywords: thermal gravitational-capillary convection, laminar-turbulent transition, temperature field on the free surface, thermal imager, statistical temperature field characteristics
Pages: 111-120
Abstract
Flows in horizontal fluid layers with a free upper boundary with uniform heating from below are studied. With the use of thermal imaging scanning, the temperature fields on the free fluid surface in laminar and turbulent regimes of the Rayleigh-Benard convection are measured. Computer processing of thermal imaging movies makes it possible to obtain spatial-temporal characteristics of cellular and multiscale convective flows.
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