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Simulation of thermally developing laminar ow in partially filled porous pipes under wall suction

Nouri Borujerdi, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. Publisher: Sharif University of Technology
  3. Abstract:
  4. This study numerically investigates uid ow and heat transfer enhancement of a two-dimensional developing laminar ow in an axisymmetric pipe with partially filled porous material attached to the wall. The effects of porous layer in the range of 0 ≤ δ=R < 1 and Darcy number in the range of 10-6 ≤ Da ≤ 10-4 are investigated. It is found that thermal entrance length increases with porous layer thickness and is longer than a plain pipe. In addition, the dependence of Nusselt number on the thickness of the porous layer is not monotonic. A critical value of the porous layer thickness exists at which the Nusselt number value reaches the minimum. As the porous layer is thickening, more uid is pushed towards the middle of the pipe and less uid goes through the porous layer in comparison with the case that the porous layer is located in the center. In this case, the heat convection is reduced relative to heat conduction due to the physical contact between the solid matrix and the wall surface
  5. Keywords:
  6. Partially filled porous pipe ; Heat conduction ; Heat convection ; Numerical methods ; Nusselt number ; Porous materials ; Critical value ; Developing forcedconvection laminar ow ; Entrance length ; Heat Transfer enhancement ; Physical contacts ; Porous pipes ; Thermal entrance lengths ; Wall suction ; Heat transfer
  7. Source: Scientia Iranica ; Volume 23, Issue 6 , 2016 , Pages 2641-2649 ; 10263098 (ISSN)
  8. URL: http://www.scientiairanica.com/en/ManuscriptDetail?mid=3794