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Experimental Investigation of Pulsating Heat Pipe Filled with Nanofluid and Microfluid and Influencing Factors

Haghayegh, Shahab | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46318 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saidi, Mohammad Hassan; Behshad Shafii, Mohammad; Afshin, Hossein
  7. Abstract:
  8. Improving efficiency of heat exchangers has always been an important concern for the industry. Pulsating heat pipes are novel and efficient technology in the field of heat transfer. Pulsating heat pipes are widely used in solar water heaters, solar desalination systems, air conditioning systems, cooling of electronical boards, etc. these applications explain the necessity of performing this study in our country. In this research, thermal performance of open loop pulsating heat pipes using two operating fluids (ferrofluid with surfactant and aluminum microfluid) is experimentally investigated. Start-up and steady thermal performance of pulsating heat pipes charged with these two operating fluids is compared to the pulsating heat pipes charged with distilled water. Moreover, different factors which impacts on their performance are studied. Results show that both of the investigated fluids can improve heat transfer of pulsating heat pipes in comparison to distilled water as the working fluid. Moreover, an increase in evaporator and condenser length of the pulsating heat pipe charged with ferrofluid with surfactant, results in an improvement in pulsating heat pipe performance. In the case of Aluminum microfluid charged pulsating heat pipe, 60 % charging ratio, 5% microfluid concentration, and 67 degree angle leads to the best start-up and steady state thermal performance.The most important achievement of this research is an open loop pulsating heat pipe that has a good performance in high powers and achieving the thermal resistance of 0.18 K/W
  9. Keywords:
  10. Pulsating Heat Pipe ; Steady State Performance ; Startup Performance ; Heat Resistance ; Aluminum Microfluid ; Ferrofluid with Surfactant

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