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Numerical and Semi-Empirical Investigation of Pulsating Heat Pipe

Arabnejad, Sajad | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39156 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Shafii, Mohammad Behshad; Saboohi, Yadollah
  7. Abstract:
  8. Thermal management of electronics is a contemporary issue which is increasingly gaining importance in line with the advances in packaging technology. Immediate and consistent multi-disciplinary research is needed to cater to the prevailing trends of net power and flux levels of upcoming microelectronics products. Material science, packaging concepts, fabrication technology and novel cooling strategies are some of key areas requiring synchronal research for successful thermal management. Focusing on the latter area, this thesis attempts to describe the complex thermo-hydrodynamics of Closed Loop Pulsating Heat Pipes (CLPHPs) which are new entrants in family of closed passive two-phase heat transfer system. Pulsating heat pipe is different from the conventional heat pipes in design and working principles. It is made from a long continuous capillary tube bent into many turns, with the evaporator and condenser sections located at these turns. Moreover, an optional adiabatic zone may exist in between. There is no wick structure used in PHPs, so its simple and cheap structure, fast thermal response, and high heat transfer performance has made the PHP very attractive compared with conventional heat pipes. In this study, one experimental set-up has been envisioned, fabricated and tested. The set-up is designed for flow visualization and standard thermometry. Four major parameters including Volumetric filling ratio of the working fluid, Input heat flux, Operational orientation, and Thermo-physical properties of the working fluid have been investigated as the primary influence parameters Mathematical modeling of device has also been successfully accomplished by applying three approaches which are quite diverse in nature, viz. (a) semi-empirical modeling with non-dimensional groups, (b) modeling by artificial neural network, and (c) numerical modeling of U-shape PHP. At the end of this study program, although some nuances of the device operation still remain unexplored, it is believed that major advancement in the understanding of the thermo-hydrodynamics of PHP has been accomplished. With the progress achieved so far, the prospects for this exemplary and unprecedented technology seem quite promising
  9. Keywords:
  10. Neural Network ; Experimental Investigation ; Correlation Method ; Pulsating Heat Pipe ; Numerical Investigation

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