期刊
HEAT TRANSFER
卷 50, 期 3, 页码 1931-1950出版社
WILEY
DOI: 10.1002/htj.21963
关键词
ADM; boundary layers; GDQ computation; magnetohydrodynamics; Marangoni flow; nano-coating flows; nanofluid; porous media; thermal radiation; volume fraction
This paper develops a mathematical model for the study of steady radiative heat transfer and Marangoni magnetohydrodynamic flow of a Cu-water nanofluid under the influence of a strong magnetic field through a porous disk. Analysis of various control parameter values shows that temperature decreases with increasing Marangoni parameter, while flow accelerates.
With emerging applications for smart and intelligent coating systems in energy, there has been increasing activity in researching magnetic nanomaterial coating flows. Surface tension features significantly in such regimes, and in the presence of heat transfer, Marangoni (thermocapillary) convection arises. Motivated by elaborating deeper the intrinsic transport phenomena in such systems, in this paper, a mathematical model is developed for steady radiative heat transfer and Marangoni magnetohydrodynamic flow of a Cu-water nanofluid influencing a strong magnetic field through a porous disk. The semianalytical adomain decomposition method is employed to find the solution of flow governing equations, which are reduced into ordinary differential equation form via the Von Karman similarity transformation. Validation with a generalized differential quadrature algorithm is included. The response in dimensionless velocity, temperature, wall heat transfer rate and shear stress is investigated for various values of the control parameters. Temperature is reduced with increasing Marangoni parameter, whereas the flow is accelerated. With increasing permeability parameter, the temperatures are elevated. Increasing radiative flux boosts temperatures further from the disk surface. Increasing magnetic parameter strongly dampens the boundary layer flow and elevates the temperatures, also eliminating temperature oscillations at lower magnetic field strengths.
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