Effectiveness of exponential heat source, nanoparticle shape factor and Hall current on mixed convective flow of nanoliquids subject to rotating frame

• Published in: Multidiscipline modeling in materials and structures Vol. 15; no. 4; pp. 758 - 778
• Main Authors: Mahanthesh, B, S, Amala, B.J, Gireesha, Animasaun, I.L
• Format: Journal Article
• Language: English
• Published: Bingley Emerald Publishing Limited 01.07.2019; Emerald Group Publishing Limited
• Subjects: Chemical reactions; Computational fluid dynamics; Computer simulation; Convective flow; Fluid flow; Hall effect; Heat transfer; Laplace transforms; Magnetic dipoles; Nanofluids; Nanoparticles; Nonlinear equations; Organic chemistry; Prandtl number; Rotation; Shape factor; Temperature dependence; Tetrahedra; Thermal conductivity; Thermophysical models; Thermophysical properties; Viscosity; Working fluids; Hall current; Exponential heat source; Unsteady flow; Chemical reaction; Nanofluid; Laplace transforms method
• ISSN: 1573-6105; 1573-6113
• DOI: 10.1108/MMMS-08-2018-0146

Purpose The study of novel exponential heat source (EHS) phenomena across a flowing fluid with the suspension of nanoparticles over a rotating plate in the presence of Hall current and chemical reaction has been an open question. Therefore, the purpose of this paper is to investigate the impact of EHS in the transport of nanofluid under the influence of strong magnetic dipole (Hall effect), chemical reaction and temperature-dependent heat source (THS) effects. The Khanafer-Vafai-Lightstone model is used for nanofluid and the thermophysical properties of nanofluid are calculated from mixture theory and phenomenological laws. The simulation of the flow is also carried out using the appropriate values of the empirical shape factor for five different particle shapes (i.e. sphere, hexahedron, tetrahedron, column and lamina). Design/methodology/approach Using Laplace transform technique, exact solutions are presented for the governing nonlinear equations. Graphical illustrations are pointed out to represent the impact of involved parameters in a comprehensive way. The numeric data of the density, thermal conductivity, dynamic viscosity, specific heat, Prandtl number and Nusselt number for 20 different nanofluids are presented. Findings It is established that the nanofluid enhances the heat transfer rate of the working fluids; the nanoparticles also cause an increase of viscous. The impact of EHS advances the heat transfer characteristics significantly than usual thermal-based heat source (THS). Originality/value The effectiveness of EHS phenomena in the dynamics of nanofluid over a rotating plate with Hall current, chemical reaction and THS effects is first time investigated.