Browsing by Author "Sibanda, P."

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    A mathematical model for bioconvection flow with activation energy for chemical reaction and microbial activity
    (Indian Academy of Sciences, 2022-01-23) Dhlamini, M.; Mondal, H.; Sibanda, P.; Mosta, S.S.; Shaw, S.
    In most of the industrial processes, it is of paramount importance to control the heat and mass transfer rates to ensure high-quality products. Using nanofluids instead of ordinary fluids and using motile micro-organisms are some of the techniques to control heat and mass transfer rates. In some recent studies of bioconvection flow, activation energy, Brownian motion and thermophoretic effects are considered only for the solute and not for the microbes. Our current study incorporates these effects for the motile micro-organisms too. Few, if any results of this nature exist in literature. A system of partial differential equations is formulated to incorporate the effects of these parameters. The system of equations are solved numerically using the spectral quasi-linearisation method to gain an insight into the influence of key parameters on the fluid and flow properties. The thermophoretic force, the Brownian motion and activation energy are significant contributors in the microbes’ dynamics. The concentration of microbes decreases with an increase in the thermophoretic force and increases with increasing microbe’s Brownian motion parameter. Based on our results, we conclude that increasing activation energy leads to a decrease in microbes’ velocity. The inclusion of the microbes’ Brownian motion proved to be significant as this was shown to have an impact on the temperature, solute concentration and microbes’ concentration in the boundary layer.
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    Numerical Analysis of Couple Stress Nanofluid in Temperature Dependent Viscosity and Thermal Conductivity
    (Springer Nature, 2021-02-24) Dhlamini, M.; Mondal, H.; Sibanda, P.; Motsa, S.
    This communication reports on an innovative study of two-dimensional couple stress fluid 3 with effect of viscosity and conductivity. We proposed a new model based on temperature dependent variable thermal conductivity on kinetic theory. Our model assumes that thermal conductivity is a decreasing function of temperature rather than an increasing function. The effect of the three key parameters, viscosity, thermal conductivity and couple stress parameter are analyzed. The coupled non-linear system is further validated numerically using the spectral quasilinearization method. The method is found to be accurate and convergent. Increasing the temperature dependent parameter for viscosity is shown to reduce the heat mass transfer rates at the surface. Increasing thermal conductivity and the couple stress parameter increased the heat mass transfer rates on the boundary surface.
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    Performance characteristics of local and imported sanitary pads.
    (Zimbabwe Journal of Science & Technology, 2014) Nyoni, A.B.; Nkiwane, L.; Gonde, P.; Sibanda, P.
    A comparative study of Zimbabwean manufactured and imported sanitary pads was carried out in order to elucidate the performance characteristics that make them popular with the majority of women. Five different types of the most popular imported and locally made sanitary pads that were determined by a preliminary questionnaire survey were selected and their performance characteristics, that is, absorbency, liquid retention and strike through properties determined. The results show that imported sanitary pads are preferred by Zimbabwean women (47%) due to their performance characteristics such as comfort, odour control, size, absorption, sticking of adhesive, packaging and protection of strike through. Women using local products account for 39% of the sample population and those using both imported and local products 14% and a significant number of women in rural areas (72%) are still using alternative methods due to the prohibitive costs of modern methods of sanitary protection.