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GEOPHYSICAL ASPECTS OF TEMPERATURE WAVES IN A MOVING MEDIUM

Aleksander Lipaev

Abstract

Periodic thermal processes and periodic temperature fields are well represented in nature and technology. In nature, they occur largely due to periodic processes such as one year Earth's orbital motion, day and night cycle of the Earth's rotation around its own axis, etc. With conductive heat transfer mechanism daily temperature fluctuations almost damp in a layer thickness of about 1 m, annual temperatures do it in layer of 18 to 21 m thick. In the case where periodic heating by the Sun coincides with the mass transfer of liquid (water seepage from the surface to deep subsurface), the thickness of the layer with periodic temperature variations substantially increases. This discovery with priority dated August 19, 1964, was made by N.M.Frolov. In connection with the above mentioned, there were several publications printed in Russia related to thermal waves created in the mobile medium. The paper presents the results of studies done by A.A.Lipaev and S.N.Kravtchun. A.A. Lipaev imposed temperature waves in capillary-porous rock samples when the fluid flowed along and against the direction of temperature wave propagation. In the works of S.N.Kravtchun temperature waves probed the fluid flowing around a wire heated by alternating current along the velocity vector, i.e. extended in a direction perpendicular to the fluid flow. A striking effect produced was recorded. With the gradual increase of the flow velocity, in defiance of all expectations, temperature fluctuation amplitude clearly increases, reaches its maximum and if there is further velocity increase it decreases. Dependency studies of the amplitude and temperature wave phase shift in a moving medium versus its velocity (Frolov-Lipaev-Kravchun effect) showed its potential to be used in geophysics (creation of flow meters for liquids and meters to measure water content in oil emulsion), as well as the possibility of implementing the findings in thermal methods of reservoir stimulation when developing heavy oil deposits and natural bitumen.

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DOI resolver: doi.org/10.5593/sgem2017/14/s05.018

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