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    STUDIA PHYSICA - Ediţia nr.1 din 2014  
         
  Articol:   INVESTIGATION OF HANDMADE FERROFLUIDS’ MOTION IN A VENTILATED CAVITY USING COMPUTATIONAL FLUID DYNAMICS.

Autori:  . 		 
       
         
  Rezumat:  In this research, some more applicable ferrofluids are produced and their mechanical specifications are measured, experimentally. Also, their treatments in the ventilated cavity geometry are assessed numerically. The magnetite nanoparticles are produced by a chemical combination of Fe2+ and Fe3+ with NH3, the black deposit of Fe3O4 nanoparticles will be produced. In order to dissolve the nanoparticles in the new mediums, a proper coating should be added to them. In this case the oleic acid is the hydrophobic surfactant; which is added to the particles while their mixture with water was heated. Then they are dissolved in kerosene, brake oil, hydraulic oil and the motor oil with different particle fractures. A pressure-based procedure to solve Navier-stokes equations with finite volume formulation is developed to simulate a magnetic fluid in ventilated cavity geometry. One of the usages of this geometry is found in magnetic separation. The ventilated cavity geometry includes a square medium with one velocity inlet and one velocity outlet. In addition, a magnetic field due to a DC current carrying wire is employed on the geometry. The magnetic field intensities, its positions and ferrofluids’ mediums are changed. Then, the flow characteristics for each case are obtained to find the optimum situation for magnetic separation.

Key Words: Ferrofluid, CFD, ventilated cavity 		 
         
     
         
         
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