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Visualization of Flow Pattern and Experimental investigation of Thermal Performance in a FerroFluid Charged Pulsating Heat Pipe

Dayanim, Pantea | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45724 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Shafii, Mohammad Behshad
  7. Abstract:
  8. Nowadays, there is rapid development of practical engineeringsolutions to a multitude ofheating problems. Heat generated inmicro-devices used in manufacturing and electronics require specialsolutions. Pulsating Heat Pipes (PHPs) are novel and efficient technology in the field of heat transfer and previous researches show that using ferrofluid (magnetic nanofluid) in Pulsating Heat Pipes (PHPs) enhances the thermal performance in comparison with the case of distilled water under certain conditions by applying magnetic fields and the performance is dramatically improved at horizontal heating mode. In this research an experimental setup for visualizing two phase flows in a flat-plate Pulsating Heat Pipe (FPHP) is fabricated and tested. Water and Fe3O4 ferrofluid are used as working fluids. The ferrofluid is made without adding any surfactants. The effects of using ferrofluid as the working fluid in compare with water, heat input (20 to 110 Watts), charging ratio (30, 50 and 70%), inclination angle (0,30,60 and 90 degrees) and presence of magnetic field on the thermal performance and flow regimes of the present FPHP is investigated. The novelty of the present research is using ferrofluid as the working fluid of FPHP and investigating its thermal performance and flow regimes. Results show that the investigated ferrofluid can improve heat transfer of FPHP as compared with distilled water as the working fluid, under certain conditions. Moreover, application of magnetic field on ferrofluid charged FPHP results in reduction of evaporator temperature and thermal resistance. In the absence of magnetic field, thermal performance of ferrofluid is worse than that of water in relatively low heat inputs and better in relatively higher inputs. But in the presence of magnetic field ferrofluid charged FPHP has the best performance. In the case of water charged FPHPs and ferrofluid without magnetic field, 30 and 50 % charging ratios lead to better thermal performances. The best performance was in the case of ferrofluid in presence of magnetic field with %50 charging ratio in vertical inclination
  9. Keywords:
  10. Thermal Performance ; Geomagnetic Field ; Heating Power ; Filling Ratio ; Heat Resistance ; Ferrofluid ; Flat-Plate Pulsating Heat Pipe

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