Influence of MHD nanofluid flow on wall heating/cooling

• Published in: Physica scripta Vol. 94; no. 10; pp. 105217 - 105230
• Main Authors: Patil, P M, Shashikant, A, Hiremath, P S, Momoniat, E
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.10.2019
• Subjects: exponentially stretching surface; finite difference method; magnetohydrodynamic (MHD) flow; nanofluid; suction/injection
• ISSN: 0031-8949; 1402-4896
• DOI: 10.1088/1402-4896/ab2555

The study of wall heating and cooling in fluid systems has numerous applications in industrial sectors and also in day-to-day life. In the current investigation, we investigate the effects of applied transverse magnetic field on wall heating as well as wall cooling processes in nanofluid combined convection along an exponentially stretching vertical surface in the presence of suction/blowing. The physical problem is modeled into highly nonlinear dimensional partial differential equations along with the appropriate boundary conditions. These equations are initially subjected to non-similar transformations and then to the technique of quasilinearization in conjunction with the implicit finite difference method. The numerical results indicate that the larger values of Richardson number, which characterizes the mixed convection, and injection parameter cause an increase in the velocity profile while increasing values of thermophoresis, magnetic field and Brownian diffusion parameters increase the temperature profile. Further, the study on wall heating and cooling processes reveal that the combined effect of the magnetic field and nanoparticles is to decrease wall heat transfer rate and thus it behaves as a thermal insulator. These results are prominent to the designers of polymer industrial equipment and cooling systems.