Browsing by Author "Nkansah-Gyekye, Yaw"

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    Effects of navier slip and wall permeability on entropy generation in unsteady generalized couette flow of nanofluids with convective cooling
    (U.P.B. Sci. Bull, 2015) Mwizu, Michael H; Makinde, Oluwole D.; Nkansah-Gyekye, Yaw
    Present work investigates the effects of generalized Couette flow with convective cooling, Navier slip and permeable walls on entropy generation in an unsteady of water based nanofluids containing Copper (Cu) and Alumina (Al 2 O 3 ) as nanoparticles. Both first and second laws of thermodynamics are applied to analyse the problem. The nonlinear governing equations of momentum and energy are solved numerically using a semi discretization finite difference method together with Runge-Kutta Fehlberg integration scheme. Graphical results on the effects of different parameter variations on velocity, temperature, skin friction, Nusselt number, entropy generation rate, and Bejan number are presented and discussed.
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    Second law analysis of buoyancy driven unsteady channel flow of nanofluids with convective cooling
    (Science Publishing Group, 2015-04-18) Mkwizu, Michael Hamza; Makinde, Oluwole Daniel; Nkansah-Gyekye, Yaw
    We investigate the combined effects of buoyancy force and convective cooling on entropy generation in unsteady channel flow of water based nanofluids containing Copper (Cu) and Alumina (Al 2 O 3 ) as nanoparticles. Both first and second laws of thermodynamics are utilised to analyze the model problem. Using a semi discretization finite difference method together with Runge-Kutta Fehlberg integration scheme, the governing partial differential equations are solved numerically. Graphical results on the effects of parameter variation on velocity, temperature, skin friction, Nusselt number, entropy generation rate, irreversibility ratio and Bejan number are presented and discussed