Non-uniform mass transfer in MHD mixed convection flow of water over a sphere with variable viscosity and Prandtl number

Abstract

Purpose-The purpose of this paper is to consider axisymmetric mixed convection flow of water over a sphere with variable viscosity and Prandtl number and an applied magnetic field. Design/methodology/approach-The non-similar solutions have been obtained from the origin of the streamwise coordinate to the point of zero skin friction using quasilinearization technique with an implicit finite-difference scheme. Findings-The effect of M is not notable on the temperature and heat transfer coefficient when λ is large. The skin friction coefficient and velocity profile are enhance with the increase of MHD parameter M when λ is small. Viscous dissipation has no significant on the skin friction coefficient under MHD effect. For M ¼ 1, the movement of the slot or slot suction or slot injection do not cause any effect on flow separation. The slot suction and the movement of the slot in downstream direction delay the point of zero skin friction for M ¼ 0. Originality/value-The present results are original and new for water boundary-layer flow over sphere in mixed convection flow with MHD effect and non-uniform mass transfer. So this study would be useful in analysing the skin friction and heat transfer coefficient on sphere of mixed convection flow of water boundary layer with MHD effect.

Mixed Convection of Silica–Molybdenum Disulphide/Water Hybrid Nanoliquid over a Rough Sphere

“…In addition, it ascertains that the temperature and thermal boundary layer are diminished owing to Ri in the considered circulations. To verify the accuracy of the computational approach, the obtained outcomes found for several values of Ri, by setting all characteristics values to zero except Pr = 0.7 are compared with the outcomes of Rajakumar et al [32] in Figure 17 and it is obtained that the outcomes are well agreed.…”

“…To verify the accuracy of the computational approach, the obtained outcomes found for several values of Ri, by setting all characteristics values to zero except Pr = 0.7 are compared with the outcomes of Rajakumar et al [32] in Figure 17 and it is obtained that the outcomes are well agreed. Table 4 shows the influence of different values of combined convection parameter for mono nanofluid and hybrid nanofluid for skin-friction coefficient and energy transport strength.…”

“…The subscripts hnf, f and nf and denotes hybrid nanoliquid, base liquid and nanoliquid respectively. Following non-similarity parameters as in Patil et al [44,47], Rajakumar et al [32] and Roy et al [33] are employed. The non-similarity transformations and resulting flow variables are as follows:…”

“…Figure17. Angular patterns of the skin friction parameter for Pr = 0.7 compared to outcomes of Rajakumar et al[32] obtained by choosing all parameter values to zero.…”

“…In addition, Rashad et al [31] examined the combined convective motion past a sphere and authors have ascertained that the chemical effects are noticeable for energy transport strength. Further, many researchers also analyzed the combined convective water boundary layer flow over a sphere [32,33].…”