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Experimental Investigation on Forced Convection Heat Transfer of Ferrofluids under an Alternating Magnetic Field

Yarahmadi, Mehran | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46796 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Shafii, Mohammad Behshad
  7. Abstract:
  8. This research study presents an experimental investigation on forced convection heat transfer of an aqueous ferrofluid flow passing through a circular copper tube in the presence of a magnetic field. Both constant magnetic field and alternating magnetic field was examined. Moreover magnetic field layout and strength and modes of alternating magnetic field was investigated. The flow passes through the tube under a uniform heat flux and laminar flow conditions. The primary objective was to intensify the particle migration and disturbance of the boundary layer by utilizing the magnetic field effect on the nanoparticles for more heat transfer enhancement. Complicated convection regimes caused by interactions between magnetic nanoparticles under various conditions were studied. The process of heat transfer was examined with different volume concentrations and under different frequencies of the applied alternating magnetic field in detail. The convective heat transfer coefficient for distilled water and ferrofluid was measured and compared under various conditions. The results showed that applying an alternating magnetic field can enhance the convective heat transfer rate but constant magnetic field affects the heat transfer process inversely. Increasing the alternating magnetic field frequency affects the convective heat transfer differently under different modes. The effect of the magnetic field in low Reynolds and high volume concentration numbers was higher, and a maximum of 19.8% enhancement in the convection heat transfer was observed with respect to heat transfer of ferrofluid with no magnetic field
  9. Keywords:
  10. Geomagnetic Field ; Heat Transfer Enhancement ; Forced Convection ; Ferrofluid ; Heat Transfer ; Convective Forced Heat Transfer

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