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Visualization of Pool Boiling Heat Transfer of Magnetic Nano-Fluid

Zarei Salehabad, Mostafa | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 52488 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Shafiee, Mohammad Behshad; Moosavi, Ali
  7. Abstract:
  8. The use of nano-fluid, which is a stable solid liquid mixture, has been proposed as a new strategy for heat transfer operations. Much research has been done on heat transfer of nano-fluids until now, whereas the study of phenomena associated with phase change, such as boiling where there is heat transfer in larger scales is very necessary. The boiling process based on its potential for transferring high amounts of heat at low temperatures is a very effective and common mechanism, and it occurs in many engineering systems, including boilers at plants, evaporators in refrigeration systems and nuclear reactors. Also, a considerable amount of research was done recently in the field of electronic equipment cooling using boiling heat transfer. Introducing an excellent performance in heat transfer, Ferro-fluids have been utilized to study the effective parameters of pool boiling. Changes in pool boiling heat transfer of magnetic fluids are a function of magnetic field and concentration of nano-particles. No experiments have been done to visualize the exact phenomena during the boiling of Ferro-fluids with different concentrations. In this experiment, thanks to the design and fabrication of a novel hele-shaw vessel with glass sides, it is possible to explore what exactly takes place in the pool boiling of Ferro-fluids. Boiling patterns of Ferro-fluids with varying concentrations have been visualized –both in the presence of a constant magnetic field and without any magnetic field. The test has been conducted considering four different concentrations, namely 30ppm, 40ppm, 50ppm and 500ppm, and the visualization helped to elaborate on how Ferro-fluid affects the boiling ebullition cycle
  9. Keywords:
  10. Boiling ; Heat Transfer ; Nanofluid ; Magnetic Fields ; Ferrofluid ; Pool Boling

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