Articles, Conference and Workshop Papers Collection

Permanent URI for this collectionhttp://10.10.97.169:4000/handle/123456789/83

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Browsing Articles, Conference and Workshop Papers Collection by Subject "Couette flow"

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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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    Numerical investigation of entropy generation in unsteady MHD generalized Couette flow with convective cooling
    (Communication in Mathematical Modeling and Applications, 2019-12-31) Kigodi, O.; Mkwizu, M. H.; Matofali, A. X.; Selemani, M. A.; Ainea, N.; Khamis, S.; Karugila, G. K.
    This study aimed at making an investigation on entropy generation in unsteady MHD generalized couette flow with convective cooling. Specifically the study intended to; develop flow model for a case of nanofluid in a channel, determine the effect of different parameters on velocity, temperature and entropy generation and to determine the effect of magnetic field on the flow on an entropy generation. Also the study aim to come up with distinctively recommendation on dynamics of entropy generation, temperature variation and velocity profiles in unsteady MHD flow with convective cooling. Findings showed that an increase in nanoparticles and Reynolds number leads to increase in the velocity while pressure gradient, MHD and nanofluid fraction held constant. It is evidently that Alumina-water nanofluid tends to raise the velocity profile faster than Copper-water nanofluid. Also the results show that an increase in Eckert number causes the decrease in temperature profile. Further, it was noticed that Copper-water nanofluid tends to raise the temperature profile faster than Alumina-water nanofluid. More interestingly it was observed that the entropy generation rises as the result of increase in Eckert number. Also it is noticed that entropy generation rises in lower plate but when it comes closer the upper plate the entropy generation rate starts to fall as the result of increase in nanoparticles.