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Experimental Investigation of the Effects of Asymmetrical Grooves on Thermosyphon Heatpipes

Bahmanabadi, Amir | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51492 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Behshad Shafiei, Mohammad
  7. Abstract:
  8. technologies for cooling of electronic devices, have high efficiency due to the heat transfer in two-phase state. In this project, experimental effects of asymmetric triangle groove has been studied on the boiling fluid and effect of the motion on the boiling and heat pipe. Therefore, the experiment has been done by 3 heat pipes and each with 3 plates. The plates consist of a smooth plate, a plate with triangle groove and a plate with rectangle groove. Each heat pipe was filled by methanol in volumetric percentage from 10 to 60. The results show that 20 percent methanol is the optimum for all kind of heat pipe, which has been used. In addition, it is shown that heat pipe with triangle groove has a better performance in wide range of power and volumetric percentage of pipe in comparison with other pipes. In optimum volumetric percentage, it has 25% and 42% better performance than the rectangular groove and flat plate, respectively. Also, methanol boiling has been investigated on these three panels to investigate the effect of these grooves on boiling performance. The results demonstrate that the boiling on the triangular groove plate improved at temperature of above 20 ° C, in comparison with flat plate 74% and 30% when compared with rectangular plate. At the end, an experiment was conducted to investigate the effect of these grooves on the film's boom at high temperatures of Leiden Frost. The results showed that in the bubbling of the droplets, with a diameter of 0.5 ml, on a flat, rectangular, and triangular groove, it takes 150, 120, and 90 seconds, respectively, to completely dry the droplet
  9. Keywords:
  10. Thermosyphon Heat Pipe ; Filling Ratio ; Input Power ; Heat Resistance ; Asymmetric Groove ; Boiling

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