Variable thermal conductivity and diffusivity of liquids and gases near a rotating disk with temperature dependent viscosity

Abstract In this study, we present the thermo-physical characteristics of Newtonian fluid over a heated rotating disk. Liquid and gas-type phenomena depending on temperature are considered near the boundary-layer region. Temperature-dependent liquid viscosity is found to reduce the mean velocity profile range and expands the mean temperature profile, but for gases opposite impact is noticed. Under moderate transformations, the radial, azimuthal and temperature profiles are illustrated. Furthermore, the dependence of thermo-physical properties on temperature and concentration are also considered. Numerical solution of the differential equations are then calculated by employing a RK-five integration scheme along with a shooting method. All of the obtained results are discussed for the base flow, temperature and concentration profiles and physical interpretation has been given through figures and tables. The comparative data is calculated for a limited case and good agreement is noticed with previously published article.