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摘要
Transient hydromagnetic flow, heat, and mass transfer of a conducting nanofluid in a Darcian porous medium is studied. The heat generation/absorption effect is incorporated based on the dual formulation of Tsai et al. (Tsai, R., Huang, K. H., and Huang, J. S., Flow and Heat Transfer over an Unsteady Stretching Surface with Non-Uniform Heat Source, Int. Commun. Heat Mass Transfer, vol. 35, pp. 1340-1343, 2008), for space and temperature dependence. Multiple slip phenomena are also featured in the model to simulate certain industrial polymer flows where the no-slip wall boundary condition is violated. A 2D unsteady incompressible boundary layer model is developed for water based nanofluid containing two different types of nanoparticles, namely alumina and copper nanoparticles. The resulting partial differential equations with corresponding boundary conditions are rendered into a system of coupled ordinary differential equations via suitable similarity transformations. The nonlinear boundary value problem is then solved with Maple quadrature. Validation of solutions is achieved with previous studies for selected values of Prandtl number and temperature-dependent heat generation/absorption parameter, demonstrating very good correlation. The influence of Richardson number, buoyancy ratio parameter, nanoparticle solid volume fraction, magneto-hydrodynamic body force parameter, Darcy number, unsteadiness parameter, wall transpiration (suction/injection parameter), velocity slip parameter, thermal slip parameter, mass slip parameter, space- and temperature-dependent heat source/sink parameter on velocity, temperature, and concentration distributions are examined. Furthermore the effects of these parameters on skin friction, Nusselt number, and Sherwood number are also analyzed. The present simulations are relevant to magnetohydrodynamic energy devices exploiting nanofluids.
- 出版日期2015
