OPTICAL DIAGNOSTICS OF THE STRUCTURE AND EVOLUTION OF BUOYANT JETS IN A HIGH–VISCOSITY FLUID
V. A. Arbuzov1,2, E. V. Arbuzov2,3, V. S. Berdnikov1,2, N. S. Bufetov1, Yu. N. Dubnishchev1,2, E. O. Shlapakova2
1Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’eva 1, Novosibirsk, 630090 Russia
2Novosibirsk State Technical University, pr. Karla Marksa 20, Novosibirsk, 630073 Russia
3Sobolev Institute of Mathematics, Siberian Branch, Russian Academy of Sciences, pr. Akademika Koptyuga 4, Novosibirsk, 630090 Russia
Keywords: optical diagnostics of the flow, Hilbert optics, interferometry, thermogravitational convection, buoyant jets
Abstract
The structure and evolution of thermogravitational buoyant jets in a high-viscosity fluid above a linear source of heat suddenly switched on are studied by methods of the Hilbert optics and interferometry. Such jets can be considered as a model of an upward flow in the spreading zone in geodynamic problems associated with the behavior of the Earth’s mantle at large depths. Based on the interferogram structure, three-dimensional reconstruction of the temperature field in the jet is performed. The Hilbert image of the reconstructed three-dimensional temperature field is compared with the Hilbert image and interferogram of the jet.
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