Loading...

Modeling of Fluid Flow and Heat Transfer at the Entrance Zone of a Partially Filled Porous Channel

Inanloo, Saeed | 2017

740 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49522 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Nouri Borujerdi, Ali
  7. Abstract:
  8. This paper numerically studies the convection heat transfer enhancement of a developing two dimensional laminar flow in a pipe partially filled with porous materials. One of the most important effects of the systems with porous materials in them, is that they can improve some heat transfer components if they be used in a proper way. This study has been performed under both local thermal equilibrium (LTE) and local thermal non-equilibrium (LTNE) conditions. Two energy equations are used in non-thermal equilibrium condition between fluid and porous material. Darcy-Brinkman-Forchheimer model is used to model the flow inside the porous medium. The effects of different parameters such as, Darcy number (Da), porous material thickness (), porosity of the porous material (), conductivity ratio of the fluid and the porous medium (Ks/Kf), different models at the interface of the porous material and the fluid flow, particle diameter of the porous material (dp) and the validity of local thermal equilibrium are investigated. The optimum thickness of porous material for convection heat transfer enhancement is determined with considering a reasonable pressure drop. The thermal boundary condition of pipe is constant wall temperature. The porous thickness is in the range of 0≤ /R ≤1 and Darcy number is in the range of 10-6 ≤ Da ≤ 10-2. As the porous layer is thickening, more fluid diverges from the middle of the pipe and less fluid goes through the porous layer. It is found that the elimination the inertia term is a valid condition for Darcy numbers less than 10-3. It is also found that thermal entrance length decreases with thickening of the porous material
  9. Keywords:
  10. Local Thermal Non-Equilibrium ; Local Thermal Equilibrium ; Optimization ; Numerical Solution ; Convection Heat Transfer ; Partially Filled Porous Pipe ; Developing Laminar Flow

 Digital Object List

 Bookmark

No TOC