By a News Reporter-Staff News Editor at Journal of Technology -- Investigators publish new report on Heat and Fluid Flow. According to news reporting originating in Islamabad, Pakistan, by VerticalNews journalists, research stated, "The purpose of this work is to study the mixed convection boundary layer flow past a vertical cylinder in a porous medium saturated with a nanofluid. Numerical results for friction factor, surface heat transfer rate and mass transfer rate have been presented for parametric variations of the buoyancy ratio parameter Nr, Brownian motion parameter Nb, theimophoresis parameter Nt and Lewis number Le."
The news reporters obtained a quote from the research from the COMSATS Institute of Information Technology, "The dependency of the surface heat transfer rate (Nusselt number) and mass transfer rate on these parameters has been discussed. Design/methodology/approach - Solutions of the set of non-similarity equations are obtained by employing the implicit finite difference method together with Keller box elimination method. It was found that the heat transfer rate decreases and mass transfer rates increase as Lewis number increases. The heat and mass transfer rates increase as the buoyancy ration parameter increases. As the thermophoresis parameter Nt increases, the heat transfer rate decreases where as the mass transfer rate increases. As the Brownian parameter Nb increases, the heat transfer rate decreases. Brownian motion decelerates the flow in the nanofluid boundary layer. Brownian diffusion promotes heat conduction. The heat and mass transfer rates increase as the buoyancy ratio number Nr increases. The Brownian motion and thermophoresis of nanoparticles increases the effective thermal conductivity of the nanofluid. Both Brownian diffusion and thermophoresis give rise to cross diffusion terms that are similar to the familiar Soret and Dufour cross-diffusion terms that arise with a binary fluid. Research limitations/implications - The analysis is valid for steady, mixed convection two-dimensional boundary layer flow in a nanofluid-saturated Darcy porous medium. An extension to non-Darcy porous medium is left as a part of future study. Practical implications - The research is applicable for enhancing heat exchanger effectiveness by employing nanofluids."
According to the news reporters, the research concluded: "Originality/value - The study is useful to engineers interested in designing heat exchangers, water and atmospheric pollution."
For more information on this research see: Mixed convective boundary layer flow over a vertical cylinder embedded in a porous medium saturated with a nanofluid. International Journal of Numerical Methods for Heat & Fluid Flow, 2013;23(8):1393-1405. International Journal of Numerical Methods for Heat & Fluid Flow can be contacted at: Emerald Group Publishing Limited, Howard House, Wagon Lane, Bingley BD16 1WA, W Yorkshire, England. (Emerald Group Publishing - www.emeraldinsight.com; International Journal of Numerical Methods for Heat & Fluid Flow - www.emeraldinsight.com/journals.htm?issn=0961-5539)
Our news correspondents report that additional information may be obtained by contacting R.S.R. Gorla, COMSATS Inst Informat Technol, Dept. of Math, Islamabad, Pakistan.
Keywords for this news article include: Asia, Pakistan, Islamabad, Heat and Fluid Flow
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