Browsing by Author "Materu, Victoria James"

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    Boundary layer flow of a nanofluid over a cylinder embedded in porous medium with heat source and variable fluid properties.
    (University of Dar es Salaam, 2018) Materu, Victoria James
    Natural convection boundary layer flow of a nanofluid over a cylinder embedded in porous medium with variable fluid properties and heat source has been discussed. The boundary layer governing equations have been derived by combining the Brownian motion and thermophoretic effects. The coupled boundary layer equations are non-dimensionalized and transformed into similarity forms using appropriate similarity variables. The similarity equations have been solved numerically using MATLAB. The effects of nanoparticle concentration dependent viscosity μ(θ) and thermal conductivity k(θ) together with heat source on velocity, temperature, nanoparticle concentration, local Nusselt and Sherwood number in the boundary layer have been analyzed. The results illustrate that an increase in Brownian motion parameter increases heat and mass transfer while an increase in thermophoretic parameter decreases the heat and mass transfer within the boundary layer. Furthermore, increase in heat source parameter increases the temperature and velocity profiles and decrease the nanoparticle concentration profile in the boundary layer. The variable viscosity and thermal conductivity parameters are shown to have significant effects on temperature, velocity and nanoparticle concentration profiles.