Flow of magnetized Oldroyd-B nanofluid over a rotating disk

Abstract

Nanofluids have been getting considerable attention in recent years owing to their great importance in an enhanced thermophysical heat transfer as well as the potential usage in various applications like drug delivery and oil recovery. In this study, the characteristics of an Oldroyd-B nanofluid flow caused by axially symmetric rotating disk are analyzed with the features of vertically applied magnetic field. The speciality of current viscoelastic type fluid model involves relaxation and retardation times characteristics. An innovative Buongiorno model is introduced to characterize the heat and mass transport of Oldroyd-B nanofluid considering the impacts of thermophoresis and Brownian diffusion. Consideration is focused on mathematical formulation of momentum equations based on boundary layer approximation theory. The conversion of governing continuity, momentum, energy and concentration expressions into dimensionless forms is based on von Karman similarity variables. The numerical integration of resultant problem is performed through BVP Midrich scheme in Maple. The attained outcomes are exhibited through flow fields, temperature and concentration of nanoparticles distributions as well as local Nusselt and Sherwood numbers. Results reveal that the occurrence of magnetic field in the flow region leads to loss of fluid movement. Also, the thermal and solutal distributions enhance substantially with rising values of retardation time parameter. Moreover, the temperature of liquid boosts up for up growing values of thermophoresis and Brownian motion parameters, respectively.