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The Experimental Investigation of Rotating Pulsating Heat Pipe

Aboutalebi, Mohammad | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42425 (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. Rotating pulsating heat pipe is a mechanism 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 and rotational acceleration were examined experimentally. The Innovation in the research was to obtain different thermal performance at a constant heat input by changing the rotational acceleration. 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 and maybe at high heat input, due to the effect of dry out at pipe wall, thermal residency sharply increase. Also by increasing the rotational acceleration, equal thermal residency decreases for a specific heat input and the possibility of dry out is minimum at this heat input. The most and least thermal residencies obtained in experiments were 1.92 K/W and 0.77 K/W which the first was obtained at 0rpm rotational acceleration,100W heat input and filling ratio of 0.75, and the second one was at 800rpm rotational acceleration,100 W heat input and filling ratio of 0.5, respectively
  9. Keywords:
  10. Heat Resistance ; Evaporators ; Condensers ; Heat Input ; Rotational Acceleration ; Filling Ratio

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