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Fabrication and Mathematical Modelling of a Novel Loop Heat Pipe for the Purpose of Operating Temperature Control

Khalili, Mohammad | 2016

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 48608 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Shafii, Mohammad Behshad
  7. Abstract:
  8. A Loop heat pipe (LHP) is an efficient two phase heat transfer device that is widely used in cooling applications. In this research a novel LHP was designed, fabricated and its performance was investigated through various experiments. The novel LHP has a new arrangement in evaporator and reservoir configuration in comparison with conventional LHPs, which results in a different energy and fluid flow. In addition, the novel LHP has a new mechanism for active control of working temperature which was not already used. Aside from its good performance, this LHP has easier and lower cost manufacturing process compared with the conventional ones. Also the proposed temperature control method is simpler in comparison with the other methods; and the temperature of the system would be changed just by moving a steel ball in the evaporator section. In addition, in this research the steady state operating characteristics of the novel LHP have been analyzed in a one dimensional approach through heat transfer and pressure drop correlations. In order to model the proposed LHP, at first the fluid and energy flows of all parts of the system were determined, then proper correlations for calculating each energy flow were selected. Afterward, these correlations were arranged in a proper algorithm to develop a 1-D steady state code. The main objective of this code was to predict the temperature distribution along the loop, such as evaporator body and reservoir section in terms of applied heat power and geometrical characteristics of the system. The steady state code can also predict the effect of proposed novel active temperature control method, on working temperatures and pressure drops of the device. Finally the steady state 1-D model was verified with experiments results to check the accuracy of the code. The results of the modeling at different applied heat powers were consistent with the results of the experiments
  9. Keywords:
  10. Loop Heat Pipe ; Active Temperature Control ; Mathematical Modeling ; Experimental Test ; Heat Leak

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