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ISSN Online: 2688-7231

ISBN Online: 978-1-56700-524-0

Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
December, 17-20, 2021, IIT Madras, Chennai, India

Non-Oberbeck-Boussinesq Effects in Natural Convection to Shear-Thinning Power-Law Fluids

Get access DOI: 10.1615/IHMTC-2021.1330
pages 885-890

Abstract

In this work, the Non-Oberbeck-Boussinesq effects combined with the power-law behavior of the fluid has been numerically investigated to elucidate the extent and significance of temperature-dependent fluid properties. In this context, an isothermal horizontal cylinder is taken in to account for natural convection to unconfined shearthinning (0.3 ≤ n ≤ 1) power-law fluids with practical characteristic temperature difference ΔT of 20K (where the Oberbeck-Boussinesq (OB) approximation fails). The powerful computational fluid dynamics (CFD) solver ANSYS-Fluent has been implemented to perform the finitevolume method (FVM) based numerical computations for the present work. This paper outlines the relative importance of temperature-dependent flow consistency index (C) and temperature-dependent thermal expansion coefficient (α) on both momentum and heat transfer characteristics. Effects of both individual temperature dependency of thermal expansion coefficient (α-NOB) and consistency index (C-NOB) and combined temperature dependency (NOB) on average Nu changes are also expounded in this study. At the extreme value of temperature difference, ΔT = 20K, the NOB effect augments the average Nu by 33% at n = 0.3, which reduced to 17% at n = 1 (Newtonian case), with reference to the OB solutions.
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