ENTROPY GENERATION STUDY OF STAGNATION POINT FLOW AND HEAT TRANSFER OF NON-NEWTONIAN NANOFLUID OVER STRETCHING SURFACE

Steady 2-D laminar forced convection stagnation point flow, heat transfer, mass transfer and entropy generation of an incompressible non-Newtonian nanofluid towards a linearly stretching permeable isothermal surface embedded in a Darcy porous medium in the presence of viscous dissipation, thermal radiation, heat generation/absorption and chemical reaction is numerically studied. The model used for the nanofluid incorporates the effects of Brownian motion and thermophoresis. Also, the Jeffrey model is used to indicate the non-Newtonian fluid. The boundary layer continuity, momentum, energy, and concentration equations are transformed using appropriate similarity transformations to three coupled nonlinear ordinary differential equations (ODEs). Then the ODEs are solved by applying the implicit Keller’s box numerical technique. The effects of various parameters including ratio of relaxation to retardation times, Deborah number, porous medium permeability parameter, suction/ injection parameter, velocity ratio parameter, Reynolds number, dimensionless Brinkman group, dimensionless concentration difference and dimensionless constant parameter on entropy generation number are presented graphically and analyzed.

کلیدواژه ها:

stagnation point flow ، non-Newtonian nanofluid ، heat generation/absorption ، chemical reaction ، entropy generation