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Mixed Convection of Nanofluids in Channels Partially Filled with a Porous Medium

Hajipour Shirazifard, Mastaneh | 2013

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 44465 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Molaei Dehkordi, Asghar
  7. Abstract:
  8. In the present study, mixed-convective heat transfer of nanofluids in a vertical rectangular channel partially filled with open-cell metal foam has been investigated experimentally and numerically. Al2O3–H2O nanofluids with different concentrations were synthesized and their stability was inspected with UV-Vis spectroscopy. The outlet temperature and pressure drop were measured for different nanofluid flow rates (i.e., Reynolds number values). In the numerical section, a two-dimensional volume-averaged form of the governing equations was used. The velocity and temperature profiles were obtained using finite difference method. The Brinkman–Forchheimer extended Darcy model and the Navier-Stokes equations were used to describe the fluid flow in the porous and free flow regions, respectively. The model used for the nanofluids incorporates the effects of Brownian motion and thermophoresis. With different thermal boundary conditions, velocity and temperature profiles and expressions for the Nusselt number values were obtained. Finally, a parametric study was conducted to investigate the influences of various parameters on the fluid flow pattern and heat-transfer performance. In addition, an analytical solution was obtained using a two-parameter perturbation method to compare the results. The simulation results of the numerical model were validated against those obtained experimentally and acceptable agreement was found. The predicted results clearly indicate that the presence of the metal foam in the channel and nanoparticles in the base fluid enhances the heat-transfer process significantly
  9. Keywords:
  10. Porous Media ; Nanofluid ; Heat Losse ; Mixed Convection ; Numerical Solution ; Analytical Solution ; Perturbation Method ; Experimental Studies

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