Ionanofluids natural convection heat transfer and entropy generation in a rectangular cavity: Viscosity influence

Ionic liquids suspensions with nanoparticles are a new class of heat transfer fluids and this study aim is to outline and discuss the behavior of a new ionanofluid in a real life configuration. If it shortly describes the considered ionic liquid, its main drawback is the high viscosity, thus limiting its applicability in natural convection and turbulent flow applications. In this regard, this research is focused on the study of several suspensions based on a mixture between water and [C(2)mim][CH3SO3] and alumina nanoparticles behavior in natural convection. The study is considering different high aspect ratio cavities up to 4 and the Rayleigh number varies from 10(3) to 10(5). Nusselt number and Bejan number for heat transfer and entropy generation are evaluated. As a main conclusion, it may affirm that heat transfer decreases while the entropy generation increases with the addition of nanoparticles. Finally, even more studies are mandatory, it is recommended to use these new fluids in forced convection instead of natural convection. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study examines the behavior of ionic liquids suspensions with nanoparticles in a real life configuration, finding that heat transfer decreases and entropy generation increases with the addition of nanoparticles. The high viscosity of the ionic liquid limits its applicability in natural convection, suggesting that these new fluids should be used in forced convection instead.