Browsing by Author "Matofali, A. X"

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    Entropy generation in a variable viscosity transient generalized couette flow of nanofluids with navier slip and convective cooling
    (Ijaamm, 2018) Mkwizu, M. H; Matofali, A. X; Ainea, N
    This work investigates the combined effects of thermophoresis, Brownian motion and variable viscosity on entropy generation in a transient generalized Couette flow of nanofluids with Navier slip and convective coolingof water-based nanofluids containing Copper (Cu) and Alumina (Al 2 O 3 ) as nanoparticles. Both first and second laws of thermody- namics are applied to analyse the problem. The nonlinear governing equations of continuity, momentum, energy and nanoparticles concentration are tackled numerically using a semi discretization finite difference method together with Runge-Kutta Fehlberg integration scheme. Numerical results for velocity, temperature, and nanoparticles con- centration profiles are obtained and utilised to compute the entropy generation rate, irreversibility ratio and Bejan number. Pertinent results are displayed graphically and discussed quantitatively.