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    • Keywords


      Global circulation; period of heating; Darcy number; Rayleigh number; natural convection.

    • Abstract


      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.

    • Author Affiliations



      1. Mechanical Engineering Department, National Institute of Technology Sikkim, Ravangla, South Sikkim 737139, India
      2. Mechanical Engineering Department, Indian Institute of Technology Delhi, New Delhi 110016, India
      3. Mechanical Engineering Department, Motilal Nehru National Institute of Technology Allahabad, Prayagraj 211004, India
    • Dates

  • Sadhana | News

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