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Modeling and Simulation of Magnetic Nanofluids Convective Heat Transfer around a Sphere in the Presence of External Magnetic Feild

Abbasi, Zeinab | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48043 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Molaei Dehkordi, Asghar
  7. Abstract:
  8. The good performance in cooling, especially in systems with small dimensions, is one of the critical needs of many industries. Heat transfer around sphere in all systems that contain particles, is important. Many methods have been proposed to improve the heat transfer rate but using nanofluids is one of the ways that has attracted more attention than others. Ferrofluids have magnetic properties in addition to nanofluids properties and this has a significant impact in increasing the heat transfer rate. Controlling heat transfer by magnetic field is one of the unique characteristics of this fluid. The project aim is to investigate the effect of magnetic field on heat transfer around sphere in presence of magnetic field. For this purpose, the heat around the sphere in the absence of the field has been validated with experimental and numerical results. Then size and volume fraction of particles in the absence of magnetic field is examined. By solving the equations of the system with COMSOL, the effect of magnetic field strength, size and volume fraction of nanoparticles, relative magnetic permeability of sphere and frequency of field on heat transfer, velocity distribution and drag coefficient in the presence of different magnetic fields, has been studied. By increasing all these parameters except frequency, the heat transfer rate is increased. The results show that the frequency has optimal value and this value increases with increasing field strength and Reynolds number. Also increasing the applied magnetic field intensity to 0.005 T, can increase heat transfer by up to three times than normal state
  9. Keywords:
  10. Heat Transfer ; Magnetic Nanodot ; Magnetic Fields ; Sphere

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