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Experimental Investigation of Heat Transfer Coefficient of Porous Materials in Various Air Pressures

Gholami, Soroush | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 49813 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Nouri Broujerdi, Ali
  7. Abstract:
  8. Heat transfer in porous media has recently become an important subject in mechanical engineering. Heat transfer in porous media is central in many applications involving industrial devices (chemical engineering, heat exchangers, nuclear reactor, etc...) as well as complex geological formations (in situ combustion and pyrolysis, geothermal sites, etc...). On track to achieve heat transfer methods and heat transfer coefficients of porous materials, this investigation describes the design process of fabrication and experimental analysis of calculation the conduction heat transfer coefficient of the uniform porous materials. We report on thermal conductivity measurements performed on uniform glass spheres with 10 mm of diameter as a porous medium under varying pressure conditions ranging from 0.2 up to 0.8 atmosphere. The objective of this study is to investigate experimentally the effect of vacuum pressure on the heat transfer rate of porous media in a conduit with fully filled porous medium under non-thermal equilibrium and calculating the conduction heat transfer coefficient of the porous medium with uniform Structure in different pressure in vacuum and the heat transfer between the wall and the porous layer is under constant heat flux. According to the experimental analysis, thermal conductivity of porous materials is changing about 1 to 12 (W/mK) which shows a good difference from the acceptable value in each pressures and sections. By comparing the results with the results obtained by Huetter and Koemle in 2008, Fesmire in 2004 or lingxue jin and cheonkyu lee in 2014, these results are almost close to each other. The determined values are in good agreement with data obtained from previous studies
  9. Keywords:
  10. Vacuum Chamber ; Thermal Conductivity ; Porous Media ; Heat Transfer ; Porous Materials ; Experimental Investigation

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