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Numerical Simulation of Heat Transfer on Topographically Structured Surfaces

Javanbakht, Mohammad Hossein | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 47953 (58)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moosavi, Ali
  7. Abstract:
  8. Numerous three-dimensional models of laminar flow and heat transfer in rough microchannels are developed and analyzed numerically to compare the effect of roughness elements on the thermal and hydrodynamic characteristics. In these models, the rough surfaces are configured with rectangular, triangular and sinusoidal roughness elements. Here, the effects of the roughness height, roughness element width, roughness element pitch, channel separation, Reynolds number and both Newtonian and non-Newtonian fluid on pressure drop and heat transfer in rough microchannels are all investigated and discussed.H2 thermal boundary condition is considered for all peripheral walls and power law model also is used for fluid modeling. Theresults indicate that the global heat transfer performance can be improved or reduced by the roughness elements at theexpense of pressure head when compared to the smooth channel. For the case of non-Newtonian fluid a reasonable heat transfer performance enhancement has been observed for the pseudo-plastic fluid by increasing the relative pitch of the rectangular roughness elements. Differing from the smooth microchannels,both the friction factor and the average Nusselt number of the rough microchannels are no longerconstant with Reynolds numbers and differfrom classical value
  9. Keywords:
  10. Heat Transfer ; Non-Newtonian Fluids ; Microstructural Surfaces ; Laminar Fluid Flow

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