Hall effects on dusty nanofluid two-phase transient flow past a stretching sheet using KVL model

• Published in: Journal of molecular liquids Vol. 256; pp. 139 - 147
• Main Authors: Gireesha, B.J., Mahanthesh, B., Thammanna, G.T., Sampathkumar, P.B.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.04.2018
• Subjects: Dusty fluid; Hall current; Mixed convection; Nanofluid; Nanoparticles; Unsteady flow; Nanoparticles; Hall current; Dusty fluid; Unsteady flow; Mixed convection; Nanofluid
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2018.01.186

The influence of Hall current on the time-dependent flow of nanofluid in the presence of dust particles is investigated. The water-based copper nanoliquid containing fine dust particles occupies a stretching surface. The effective thermal conductivity and the viscosity of the nanoliquid are estimated by KVL (Khanafer-Vafai-Lightstone) model. The notion of boundary layer approximation is employed to model the governing equations for both nanofluid and dust phases. Similarity transformations are employed to obtain ordinary differential equations from the governed partial differential equations. The numeric solutions are developed via Runge-Kutta-Fehlberg integration scheme. The graphical illustrations are to explain the impacts of the governing parameters on flow fields. It is established that the nanofluid's Nusselt number increases due to the suspension of dust particles. An enhancement of heat transfer rate has a direct relationship with Hall current and unsteadiness. •The copper nanoparticles in dusty fluid showed more enhancement in heat transfer.•The flow and thermal fields of nanofluid phase are higher than dust particle phase.•The nano or dust particles also cause an increase in viscous force.•The cross-flow velocity gradient at the wall increases with Lorentz force.•The Hall current reduces the skin friction at the wall.