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      저자 : A. A. Abbasian Arani (검색결과 2 건)
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        Double-diffusive natural convection of Al₂O₃-water nanofluid in an enclosure with partially active side walls using variable properties

        A. A. Abbasian Arani,E. Kakoli,N. Hajialigol 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11

        Natural convection heat and mass transfer characteristics in a square enclosure using variable thermal conductivity and variable viscosityare numerically studied. The fluid in the enclosure is a water-based nanofluid containing Al₂O₃ nanoparticles. The top and bottomhorizontal walls are insulated, while a source (Th, Ch) and a sink (Tc, Cc) are located at the vertical left and right walls as active parts,respectively, with Th>Tc and Ch>Cc. The governing equations in the two-dimensional space are discretized using the control volumemethod. A proper upwinding scheme is employed to obtain stabilized solutions. The study has been carried out for the Rayleigh numbersof 104 to 106, the buoyancy ratios of -5~5, and different configurations of the source and sink. Results are presented in the form of thestreamlines, isotherms and iso-concentraions as well as the average Nusselt and Sherwood numbers. It is observed that average Nusseltnumber is increased by adding the nanoparticles, while average Sherwood number is reduced. Moreover, both Nusselt and Sherwoodnumber are increased as absolute value of the buoyancy ratio or Rayleigh number is increased.

      • KCI등재

        Numerical study of laminar-forced convection of Al2O3 -water nanofluids between two parallel plates

        M. Hemmat Esfe,A. A. Abbasian Arani,T. Azizi,S. H. Mousavi,S. Wongwises 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.2

        Laminar-forced convection of Al 2 O 3 -water nanofluid between two parallel plates was studied numerically. The channel walls were assumed to be isothermal. The effective viscosity and thermal conductivity of nanofluid were considered as variables, and the effects of applying a variable properties model were investigatedby using two relatively new models. The numerical results were compared to the results obtained from a previous non-variable properties model. Also, the effects of nanoparticle size on the flow and heat transfer within the channel were investigated. The study was carried out using Reynolds numbers between 100-1000, nanoparticle diameters in the 15-75 nm range, and nanoparticle volume fractions in the range 0.01-0.05 nm. The numerical results show that using nanofluid could enhance heat transfer by up to 35 %, compared to the base fluid. In addition, reducing the nanoparticle diameter can enhance heat transfer by up to 15.9 %.

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