EXPERIMENTAL STUDY OF THE THERMO-PHYSICAL PARAMETERS OF A FREE ELEMENTARY CONVECTIVE CELL

Authors

L. S. Bozbey, National Science Center Kharkov Institute of Physics and Technology (1, Akademicheskaya St., Kharkov, 61108, Ukraine), e-mail: bozbiei@kipt.kharkov.ua

A. O. Kostikov, A. Podgorny Institute of Mechanical Engineering Problems of NASU (2/10, Pozharsky St., Kharkiv, 61046, Ukraine), V. N. Karazin Kharkiv National University (4, Svobody Sq., Kharkiv, 61022, Ukraine), e-mail: kostikov@ipmach.kharkov.ua, ORCID: 0000-0001-6076-1942

N. M. Kurskaya, A. Podgorny Institute of Mechanical Engineering Problems of NASU (2/10, Pozharsky St., Kharkiv, 61046, Ukraine)

V. I. Tkachenko, National Science Center Kharkov Institute of Physics and Technology (1, Akademicheskaya St., Kharkov, 61108, Ukraine),  V. N. Karazin Kharkiv National University (4, Svobody Sq., Kharkiv, 61022, Ukraine), e-mail: tkachenko@kipt.kharkov.ua, ORCID: 0000-0002-1108-5842

Abstract

The geometrical dimensions and mass transfer rate of an elementary convective cell are experimentally investigated. The results of the study are adequately described by a theoretical model of an elementary convective cell. It is shown that the addition of aluminum powder to oil converts the latter into a suspension, whose boundary conditions on a solid wall due to the slipping on the pure oil film can be regarded as free. Two independent methods for determining the rate of mass transfer in cells of different diameters are described: for large cells, by the probe deflection angle; for small ones, by the optical method.

Keywords: elementary convective cell, free boundaries, convective processes, heat transfer, temperature gradient

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Received 08 September 2016

Published 30 December 2016