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Numerical Study of the Effect of Permeability in Single-Phase Flow in Porous Media

Heidari Farsani, Mohammad | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 45748 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Sadrhosseini, Hani; Ashjari, Mohammad Ali
  7. Abstract:
  8. Present study is to simulate laminar flow in a channel exposed to heat flux from the walls and filled with porous media by software ANSYS CFX in finite volume method. The analysis is based on the Naviere-Stokes equations in the flow field which are modified to Brinkman-Forchheimer equations to be applicable for porous media. Effect of Reynolds number and permeability on seepage velocity, temperature distribution, heat transfer and pressure drop are investigated.Simulations are performed for two cases: fully developed flow at the entrance of the porous media and developing flow, which are corresponding to the Reynolds numbers of Re=77.6 and Re=1553 respectively (U= 0.01 m/s and U= 0.2 m/s). It is observed that higher Reynolds number results a better heat transfer and a greater pressure drop through the porous layer as expected. It is also seen that the temperature profile becomes more uniform in the porous layer when the velocity is lower. Uniformity of the velocity profile and the channeling effect has been examined as well.The effect of permeability has also been considered by modeling the problem for various porosities of the medium as φ = 0.20, 0.33, and 0.50. Results show that for the channel filled with porous media, increasing the porosity (permeability) extremely decreases the pressure drop. Presence of the porous media changes the velocity and temperature profile shape from parabolic to flat which is more visible for lower permeability; and the porosity has negative effect on heat transfer
  9. Keywords:
  10. Porosity ; Conveying Flow ; Porous Materials

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