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Influence of wavy wall and non-uniform heating on natural convection heat transfer and entropy generation inside porous complex enclosure

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  • Bhardwaj, Saurabh
  • Dalal, Amaresh
  • Pati, Sukumar

Abstract

The present work numerically analyses the heat transfer and entropy generation characteristics in a two-dimensional porous right-angled triangular enclosure with undulations on the left wall. The enclosure is heated sinusoidally from the bottom wall, while the left wall is maintained at a uniform temperature lower than the bottom one and the right inclined wall is adiabatic. The stream function-vorticity formulation with a finite difference scheme has been incorporated to simulate the results. The effects of Rayleigh number, Darcy number and undulations on the left wall on the heat transfer, fluid flow and entropy generation characteristics have been investigated. It has been revealed that for lower values of Rayleigh number, heat transfer is dominated by the conduction mechanism. However, for higher values of Rayleigh number, heat transfer by convection becomes significant. It has been further revealed that for higher values of Rayleigh number and Darcy number, the dominant source of entropy generation is due to fluid friction. Moreover, the entropy generation due to fluid friction is significantly higher in case of undulations on the wall as compared to the cases with no-undulation, whereas the entropy generation due to heat transfer is almost same for both the cases.

Suggested Citation

  • Bhardwaj, Saurabh & Dalal, Amaresh & Pati, Sukumar, 2015. "Influence of wavy wall and non-uniform heating on natural convection heat transfer and entropy generation inside porous complex enclosure," Energy, Elsevier, vol. 79(C), pages 467-481.
    • Handle: RePEc:eee:energy:v:79:y:2015:i:c:p:467-481
    DOI: 10.1016/j.energy.2014.11.036
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    References listed on IDEAS

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    1. Basak, Tanmay & Anandalakshmi, R. & Kumar, Pushpendra & Roy, S., 2012. "Entropy generation vs energy flow due to natural convection in a trapezoidal cavity with isothermal and non-isothermal hot bottom wall," Energy, Elsevier, vol. 37(1), pages 514-532.
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    5. Kaluri, Ram Satish & Basak, Tanmay, 2011. "Entropy generation due to natural convection in discretely heated porous square cavities," Energy, Elsevier, vol. 36(8), pages 5065-5080.
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    Cited by:

    1. Mikhailenko, Stepan A. & Sheremet, Mikhail A. & Pop, Ioan, 2020. "Natural convection combined with surface radiation in a rotating cavity with an element of variable volumetric heat generation," Energy, Elsevier, vol. 210(C).
    2. Garoosi, Faroogh & Hoseininejad, Faraz & Rashidi, Mohammad Mehdi, 2016. "Numerical study of natural convection heat transfer in a heat exchanger filled with nanofluids," Energy, Elsevier, vol. 109(C), pages 664-678.
    3. Biswal, Pratibha & Basak, Tanmay, 2017. "Entropy generation vs energy efficiency for natural convection based energy flow in enclosures and various applications: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 80(C), pages 1412-1457.

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