THERMAL SCIENCE

International Scientific Journal

THE EFFECT OF SURFACTANT SOLUTIONS ON FLOW STRUCTURES IN TURBULENT RAYLEIGH-BENARD CONVECTION

ABSTRACT
This paper presents an experimental study on the flow structures in turbulent Rayleigh-Bénard convection with surfactant solutions. The shadowgraph visualization was used to obtain the plumes and the velocity field was measured using particle image velocimetry. The results show that the size of plumes in surfactant solution case is larger than that in Newtonian fluid case and it needs more time for surfactant solution case to start convection. The large-scale circulation fails to form in surfactant solution case and the convection velocity is smaller. A decrease of the measured Nusselt number is observed in surfactant solution case. The above phenomena are caused by the shear-shinning and elastic chara cteristics of surfactant solution.
KEYWORDS
PAPER SUBMITTED: 2017-10-26
PAPER REVISED: 2017-11-23
PAPER ACCEPTED: 2017-11-23
PUBLISHED ONLINE: 2017-12-23
DOI REFERENCE: https://doi.org/10.2298/TSCI171026263W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Supplement 2, PAGES [S507 - S515]
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© 2018 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence