Bejan's flow visualization of buoyancy-driven flow of a hydromagnetic Casson fluid from an isothermal wavy surface

• Published in: Physics of fluids (1994) Vol. 33; no. 9
• Main Authors: Kumar, Mahesh, Mondal, Pranab Kumar
• Format: Journal Article
• Language: English
• Published: Melville American Institute of Physics 01.09.2021
• Subjects: Buoyancy; Finite difference method; Flow velocity; Flow visualization; Fluid dynamics; Graphical representations; Hartmann number; Heat transmission; Isotherms; Magnetic properties; Nonlinear differential equations; Parameters; Partial differential equations; Physics; Rheological properties; Surface waviness; Thermohydrodynamics; Visualization
• ISSN: 1070-6631; 1089-7666
• DOI: 10.1063/5.0060683

The proposed work numerically investigates the buoyancy-driven flow of Casson fluid from a vertical wavy surface under the influence of a magnetic field and evaluates the underlying transport of heat in the free convective regime both quantitatively and qualitatively. Pertaining to this analysis, the primitive forms of coupled non-linear partial differential equations are evaluated with the help of an efficient and straightforward Crank–Nicolson implicit finite difference technique. By representing the graphical plots of flow velocity, temperature, and friction-factor coefficients, obtained for different physical parametric values pertinent to this analysis, we discuss the influence of the Hartmann number, surface waviness parameter, and rheological parameter of the fluid on the underlying thermohydrodynamics. In addition to the isotherm and streamline plots, by demonstrating the functional form, we discuss an extensive flow visualization technique that provides unique heat flow visualization for the wavy surface based on Bejan's heat function concept. The results indicate that for increasing the magnitude of the magnetic parameter, the evolution of isotherms, streamlines, and heatlines deviates periodically with a higher amplitude, which signifies the transfer of high heat energy as well as the efficient transport of heat in the convective regime.