Modeling deposition of particles in vertical square ventilation duct flows

Modeling deposition of particles in vertical square ventilation duct flows
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垂直方形通风管道流中颗粒沉积的建模

DOI:
10.1016/j.buildenv.2010.07.020
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发表时间:
2011
影响因子:
7.4
通讯作者:
--
中科院分区:
工程技术1区
文献类型:
--
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采暖、通风和空调(HVAC)管道中颗粒的存在、流动和分布影响建筑物中的空气质量,从而影响建筑物居住者的健康。为了更好地阐明暖通空调管道中颗粒的流动,本文考虑了阻力、升力、重力、布朗扩散和湍流扩散对光滑垂直通风管道中颗粒无量纲沉积速度的影响,采用充分发展和发展的速度剖面。基于雷诺应力输运模型(Reynolds Stress Transport Model,RSM),在3.0m/s和7.0m/s两种不同风速下,采用雷诺平均纳维尔-斯托克斯(RANS)-拉格朗日(Lagrangian)模拟方法,对垂直流场中方形管道的上述效应进行了预测。初步结果表明,颗粒的重力并不直接改变无量纲沉积速度在垂直流。然而,颗粒的重力有助于改变萨夫曼升力。因此,Saffman升力直接改变垂直流中颗粒的无量纲沉积速度。此外,充分发展流和发展流的无因次沉积速度的差异是由于湍流扩散、湍流强度以及不同无因次颗粒弛豫时间下的Saffman升力造成的。
The presence, flow, and distribution of particle in heating, ventilation, and air-conditioning (HVAC) ducts influence the quality of air in buildings and hence the health of building occupants. To shed a better light on the flow of particles in HVAC ducts this a paper has considered the effects of drag, lift force, gravity, Brownian diffusion, and turbulent diffusion on the dimensionless deposition velocity of particles in smooth vertical ventilation ducts using fully developed and developing velocity profiles. Based on the Reynolds stress transport model (RSM) at two different air velocities, 3.0m/s and 7.0m/s, the aforementioned effects were predicted using Reynolds-averaged Navier–Stokes (RANS)–Lagrangian simulation on square shaped ducts under vertical flows. Preliminary results suggest that the gravity of particles does not directly change the dimensionless deposition velocity in vertical flows. Nevertheless, the gravity of particles contributes to changing the Saffman lift force. It is thus the Saffman lift force that directly changes the dimensionless deposition velocity of particles in vertical flows. In addition, the difference in the dimensionless deposition velocities between fully developed and developing flows is owing to the turbulent diffusion, turbulent intensity, and needless to say, the Saffman lift force under different dimensionless particle relaxation time.
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