Articles written in Sadhana

    • Influence of lower period of heating and high buoyancy inside fluid saturated porous enclosure on transient natural convection


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      Buoyancy driven thermal flow behavior inside an air saturated porous enclosure has been numerically studied for transient to steady state with the help of stream-function and isotherm profiles, Nusselt number, and entropy generation. Buoyancy has been induced from below, and the top wall is maintained at a relatively cold temperature while the periodic condition arises from left to right. Process parameters selected for this investigation are non-dimensional time (t, varied from 0.005 to 0.5), Rayleigh number (Ra, varied from 104 to 106) and Darcy number (Da, varied from 10-3 to 10-1). A typical formation of global circulation has been observed at lower periods of heating (λ/H ≤ 0.25) in cases of high Ra and high Da. Strength of the circulation rolls enhances 20 times from Ra = 104 to Ra = 105. The present investigation is commonly essential for thestability of high sensitive devices like chemical reactors.

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