Numerical examination of wall properties for the magnetohydrodynamics stagnation point flow of micro-rotating fluid subject to weak concentration

• Published in: Physics of fluids (1994) Vol. 35; no. 5
• Main Authors: Khan, Abdul Samad, Idrees, Muhammad, Khan, Noor Ul Samad
• Format: Journal Article
• Language: English
• Published: Melville American Institute of Physics 01.05.2023
• Subjects: Angular momentum; Conduction heating; Conductive heat transfer; Constitutive equations; Constitutive relationships; Differential equations; Energy transfer; Fluid dynamics; Fluid flow; Heat flux; Magnetic properties; Magnetohydrodynamics; Newtonian fluids; Non Newtonian fluids; Ordinary differential equations; Parameters; Physics; Porous media; Prandtl number; Rotating fluids; Runge-Kutta method; Skin friction; Squeeze films; Stagnation point; Stretching; Surface roughness; Transport equations
• ISSN: 1070-6631; 1089-7666
• DOI: 10.1063/5.0142576

In this investigation, stagnation point flow of non-Newtonian fluid is considered under the impact of magnetohydrodynamics, porous medium, and mixed convection effects. Additionally, angular momentum and energy transport constitutive equations are also taken into account in order to explore the fluid micro-rotational effects. The fluid motion develops by virtue of linear stretching and slip factors. Furthermore, the energy transport equation is raised with the effect of viscous dissipation and heat source phenomena. Mathematical formulations lead to a set of ordinary differential equations by introducing similarity variables. The proposed model has been solved numerically using fourth-order Runge–Kutta method with shooting technique. Influence of pertinent flow parameters for the case of weak concentration of micro-elements on velocity, temperature, skin friction, and local heat flux at the surface is computed and discussed. Different ranges are chosen for the flow parameters, for example; magnetic field variation is taken [0, 0.9], micro-rotation [0,1], stretching ratio [0,0.2], surface condition [0,1], the Prandtl number [3, 12], and the Eckert number [3, 11]. The fluid velocity slows down when the magnetic number varies from 0.0 to 0.5 in the presence of weak concentration (m = 0.5) of micro-elements. In addition, the maximum increasing percentage of skin friction is obtained when the porosity parameter varies from 0.0 to 0.6. The maximum decreasing percentage of the Nusselt number is obtained when the thermal slip parameter varies from 0.0 to 0.8. The current study has multiple fascinating applications in polymeric solutions, bio-medical functions like magnetic drug targeting, heat conduction in tissues, surface roughness, and squeeze film lubrication problems between conical bearings.