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Experimental Investigation of Pulsating Heat Pipe Using Nano-Fluid

Taslimifar, Mehdi | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43717 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saidi, Mohammad Hassan; Afshin, Hossain; Shafiee, Mohammad Behshad
  7. Abstract:
  8. Considerable increase in speed and decrease in size of electronic devices results in increase of heat flux, so there is a need to enhance efficiency of cooling electronic devices. In the present research two sets of OLPHPs with five turns for two different magnetic nano-fluids were fabricated and the effects of working fluid (water, and two types of magnetic nano-fluids), working pressure, concentration, magnetic field, magnets location, and inclination angle on the thermal performance of OLPHPs have been considered in both startup and steady thermal conditions.
    Experimental results show that magnetic nano-fluids can improve thermal performance of the OLPHPs. Application of magnetic field improves thermal performance of the OLPHPs charged with magnetic nano-fluids. At startup condition, larger internal pressure has the best performance in the presence of magnetic field. However, in the absence of magnetic field apposite trend is observable. In the case of steady thermal performance in both presence and absence of magnetic field lower internal pressure has better thermal performance. In addition, applying a magnetic field on the OLPHP charged with ferrofluid improves its thermal performance. In the case of the magnetic nano-fluid without surfactant, high concentration of ferrofluids degrades performance of OLPHP as a result of greater viscosity. However, for ferrofluid with surfactant, high concentration of ferrofluids has better thermal performance due to more heat transfer capability. Best heat transfer capability is achieved at 67.5o relative to horizontal axis for all of the working fluids. Variation of the magnetic flux density in OLPHP charged with magnetic nano-fluids, results in a heat pipe with variable thermal performance at a fixed heating power, concentration, and orientation. OLPHPs that are charged with magnetic nano-fluids lead to undeniable improvement in electronic cooling technology.

  9. Keywords:
  10. Orientation ; Pulsating Heat Pipe ; Ferrofluid ; Heat Resistance ; Nanofluid ; Magnetic Fields ; Open Loop Pulsating Heat Pipe (OLPHP)

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