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Fabrication and Experimental Investigation of Micro Heat Pipe Using Ferrofluid Under Magnetic Field

Jahani, Nariman | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41453 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Shafii, Mohammad Behshad
  7. Abstract:

  8. On track to achieve heat transfer methods for small-scale, this research describes the design process of fabrication and experimental analysis of micro heat pipes with a rectangular section. First, the overview of micro-fluid systems and conventional mechanisms of heat transfer in these systems is discussed. Then, in order to describe the research theory and principles of heat pipe, various types of heat pipes micro scale and macro scaled are analyzed. After that, the method used for fabrication of a micro heat pipe without grooves is described. A new method for fabrication of MHP is investigated in this study. By using this method, one fiber glass board is fabricated by printed circuit technology and is used as the channels of MHP. The fabricated micro heat pipe is low cost, resistant in high temperature and thin. In order to seal the MHP, a photo-resist material which is used in several industrial processes, such as photolithography and photoengraving is employed. The material increases the adhesion between surfaces, so it is proper for sealing. In addition, its effect on the thickness of MHP is negligible. Tests are conducted using rectangular cross-sections having hydraulic diameter of 100 µm. In order to investigate the performance of the micro heat pipe, laboratory equipments are needed to provide conditions to conduct the research. Three experimental setups fabricated during the study and performance of each of MHPs was studied. Each of experimental setups was designed based on removing any defects of previous systems. Therefore, the full details about each of these setups are explained. In this study, performance of micro heat pipe is investigated and the boiling phenomenon under different conditions is observed. Moreover, effect of ferro fluid on the performance of MHP under magnetic field and without field is investigated.
  9. Keywords:
  10. Ferrofluid ; Printed Circuits ; Magnetic Fields ; Photoresist Mask ; Micro Heat Pipe

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