Browsing by Author "Jolayemi, T.S."

Now showing 1 - 2 of 2
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    INFLUENCE OF SOME VARIABLE PARAMETERS ON HORIZONTAL ELLIPTIC MICRO-CHANNELS WITH INTERNAL LONGITUDINAL FINS
    (Faculty of Engineering, University of Nigeria, Nsukka, 2013) Adegun, I.K.; Jolayemi, T.S.; Olayemi, O.O.; Popoola, O.T.
    he study investigates the laminar flow and heat transfer characteristics in elliptic microchannels of varying axis ratios and with internal longitudinal fins, operating in a region that is hydrodynamically and thermally fully developed; purposely to determine the effects of some salient fluid and geometry parameters such as Reynolds number, Prandtl number, aspect ratio ( and fin heights on flow pattern and rate of heat transfer. Numerical method using the finite difference technique was adopted for the solution. A code in Quick Basic was developed to generate the results. Results show that fin height of H=0.6 provided the optimum heat transfer enhancement for the configuration of e = 0, e= 0.433 and e=0.714; for e=0.866, fin height of H= 0.4 is tolerable. Result also show that Nusselt number increases with Reynolds number for all axis ratios investigated. However, at Re=200 a slight trough was observed in Nusselt number Versus Reynolds number relationship indicating a critical flow condition. It was also established that at Pr >5, Nusselt number and bulk fluid temperature, are independent of fluid properties.
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    Numerical Simulation of Forced Convective Heat Transfer in Inclined Elliptic Ducts with Multiple Internal Longitudinal Fins
    (Elsevier, 2018) Adegun, I.K.; Jolayemi, T.S.; Olayemi, O.A.; Adebisi, A.M.
    The paper presents numerical study of forced convective heat transfer in internally finned elliptic geometry to determine the effect of parameters such as Reynolds number, Prandtl number, aspect ratio, fin heights, number of fins and orientations of the duct on the heat transfer coefficient, temperature history and velocity profiles. The walls were assumed to be subjected to a thermal boundary condition of constant heat flux and the effect of slip boundary is assumed negligible. Finite difference technique was adopted for the solution and results were generated using a code written in Qb-64. The study indicated that number of fins (F ¼ 8) provided the optimum heat transfer augmentation. For all the geometries investigated, Nusselt number, average velocity and bulk fluid temperature were enhanced by the inclinations in the range 0 6 h 6 75 . For a flow regime of 50 6 Re 6 200, the effect of inclination on heat transfer is negligible, but it worth noting the existence of a critical Reynolds number, Re ¼ 200, above which the effect of inclination on fluid flow becomes noticeable. Also, at Pr P 5, Nusselt number and bulk fluid temperature were independent of fluid properties. The results obtained could be applied in the prediction of parameters for the design of compact heat exchangers for industrial applications