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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

FORCED AND MIXED CONVECTION EFFECT OF Al2O3/WATER NANOFLUID ON THE CONJUGATE THERMAL PERFORMANCE OF STEPPED LID-DRIVEN CAVITY UNDER TURBULENT FLOW CONDITIONS

Get access DOI: 10.1615/IHMTC-2021.60
pages 39-45

Abstract

Both Forced and mixed convection heat transfer effect of Al2O3/water nanofluid on the conjugate thermal performance of two-dimensional stepped lid-driven cavity under turbulent flow conditions are numerically investigated in the present study. A validated homogeneous heat transfer model within ANSYS FLUENT is used in the present study. Three cavity types namely: no step, forward step and backward step are used in the present study in relative comparison for Reynolds number, Re = 5000 to 9000 and Grashof number, Gr = 5000, 13000 and 20000. Al2O3/water nanofluid is considered with 1 vol.%, 2 vol.% and 3 vol.% nanoparticle concentrations. The effect of cavity type, convection type, Reynolds number, Grashof number, nanoparticle volume concentration on the thermal performance is evaluated in terms of average Nusselt number (Nuavg) obtained at the fluid-solid interface. Nuavg values obtained in the present study are higher for higher values of Gr and lowest interface temperature was recorded for backward step lid-driven cavity when compared with other cavity types that result in slightly higher performance. Moreover, at Re = 9000, 3 vol.% Al2O3 nanofluid exhibits 19.68% higher thermal performance in comparison with that of pure water. Furthermore, 467.79% higher thermal performance is observed in the case of 3 vol.% Al2O3 nanofluid at Re = 9000 when compared with the same working fluid at Re = 500 as available in the literature.
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