By a News Reporter-Staff News Editor at Journal of Technology -- Fresh data on Computational Fluid Dynamics are presented in a new report. According to news originating from Lulea, Sweden, by VerticalNews correspondents, research stated, "An asymptotic approach is considered for the transport and deposition of nanofibres in pipe flow. Convection and Brownian diffusion are included, and Brownian diffusion is assumed to be the dominant mechanism."
Our news journalists obtained a quote from the research from the Lulea University of Technology, "The fibre position and orientation are modelled with a probability density function for which the governing equation is a Fokker-Planck equation. The focus is set on dilute fibres concentrations implying that interaction between individual fibres is neglected. At the entrance of the pipe, a fully developed velocity profile is set and it is assumed that the fibres enter the pipe with a completely random orientation and position. A small parameter is introduced, where l is the fibre half-length and a is the pipe radius. The probability density function is expanded for small and the solution turns out to be multi-structured with three areas, consisting of one outer solution and two boundary layers. For the deposition of fibres on the wall, it is found that for parabolic flow, and for the lowest order, the deposition can be obtained with a simplified angle averaged convective-diffusion equation. It is suggested that this simplification is valid also for more complex flows like when the inflow boundary condition yields a developing velocity profile and flows within more intricate geometries than here studied. With the model fibre, deposition rates in human respiratory airways are derived."
According to the news editors, the research concluded: "The results obtained compare relatively well with those obtained with a previously published model."
For more information on this research see: An asymptotic approach of Brownian deposition of nanofibres in pipe flow. Theoretical and Computational Fluid Dynamics, 2013;27(5):561-575. Theoretical and Computational Fluid Dynamics can be contacted at: Springer, 233 Spring St, New York, NY 10013, USA. (Springer - www.springer.com; Theoretical and Computational Fluid Dynamics - www.springerlink.com/content/0935-4964/)
The news correspondents report that additional information may be obtained from H.O. Akerstedt, Lulea University of Technology, Div Fluid Mech, S-97187 Lulea, Sweden. Additional authors for this research include S.M. Hogberg and T.S. Lundstrom.
Keywords for this news article include: Lulea, Sweden, Europe, Computational Fluid Dynamics
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