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Experimental Study of Flow Pattern and Thermal Performance of a Rotating Pulsating Heat Pipe

Alhuyi Nazari, Mohammad | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45827 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Shafii, Mohammad Behshad
  7. Abstract:
  8. Developing of electric instruments with high performance needs high capacity heat transfer equipments. Pulsating heat pipes have better performance compared with normal heat pipes and can be used for cooling electronic instruments in near future. Also, one specific kind of heat pipes, which is called rotating pulsating heat pipe, can be used in cooling the turbine blades and every rotating device. Rotating pulsating heat pipe is a cooling device in which the pipes can rotate around the axis perpendicular to the plane of pipes. In this research one rotating heat pipe was built and the effects of heat input, filling ratio, working fluid and rotational acceleration were examined experimentally, moreover, the flow pattern in it was investigated. The Innovation in the research was to obtain different thermal performance at a constant heat input by changing the rotational acceleration and working fluid. The results show that in general, at a constant rotational acceleration and filling ratio, by increasing the heat input into the evaporator, thermal residency reduces. Also by increasing the rotational acceleration, equal thermal residency decreases for a specific heat input. The most and least thermal residenciesobtained in experiments for ethanol and waterwere 2.711 K/W and 2.801 K/W and 0.925 K/W and 0.920 K/W which the first was obtained at 0rpm rotational acceleration,10W heat input and filling ratio of 0.70 for ethanol and 100W heat input and filling ratio of 0.30 for water, and the second one was at 800rpm rotational acceleration,100 W heat input and filling ratio of 0.5 and 0.6 for ethanol and water, respectively. The flow pattern in this rotating pulsating heat pipe by increasing heat input, changes from slug-plug to annular regime
  9. Keywords:
  10. Working Fluid ; Filling Ratio ; Rotational Acceleration ; Pulsating Heat Pipe ; Heat Resistance

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