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Large Eddy Simulation of the Particle Coagulation in High Concentration Particle-Laden Planar Jet Flow

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Chinese Journal of Mechanical Engineering 2011年第6期24卷 947-956页

作者： LIN Peifeng wu dichong YU Mingzhou WANG Chao ZHANG Lite ZHU Zefei Faculty of Mechanical Engineering ＆ Automation Zhejiang Sci-Tech University Hangzhou 310018 China Business Administration College Zhejiang University of Finance and Economics Hangzhou 310000 China Department of Physics China Jiliang University Hangzhou 310018 China School of Mechanical Engineering Hangzhou Dianzi University Hangzhou 310018 China

Particle coagulation by Brownian motion is an important but difficult research *** particle volume concentration is larger than 0.1%,the classic SMOLUCHOWSKI equation is not applicative *** high concentration coagulation,with HEINE＇s correction,source terms for the Taylor-series expansion method of moments（TEMOM） are firstly driven in this ***-fine particle（d0？100 mm） with initial volume fraction f？1% coagulation in a planar jet turbulence flow is simulated via the large eddy simulation（LES）.The instantaneous and time-averaged particle distributions and the high concentration enhancement are given *** particle number concentration distribution results show that the coagulation is more intense comparing to dilute case in previous research,especially near the nozzle *** jet flow is fully developed,the effect is much more obvious at the region between *** time-averaged γ（the high concentration enhance factor） distributes sharply and symmetrically about the jet centerline at the upstream,but becomes broad and flat at downstream where the cross-stream averaged γ fluctuates *** a new attempt,this paper shows Brownian coagulation with high concentration also can be calculated via TEMOM appropriately,and the coagulation at the region between vortexes is about 1.38 times intensive of the dilute result calculated by the classic Smoluchowski theory.

关键词： Coagulation LES Planar jet flow High concentration enhancement

Nanoparticle Transportation and Brownian Diffusion in Planar Jet Flow via Large Eddy Simulation

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Open Journal of Fluid Dynamics 2012年第4期2卷 354-358页

作者： Peifeng Lin dichong wu Zefei Zhu Business Administration College Zhejiang University of Finance and Economic Hangzhou China Faculty of Mechanical Engineering and Automation Zhejiang Sci-Tech University Hangzhou China School of Mechanical Engineering Hangzhou Dianzi University Hangzhou China

The nanoparticle transportation and Brownian diffusion in planar jet flow is simulated via large eddy simulation in this work. To thorough compare the Brownian diffusion with different particle size, we computed three particle diameter dp = 1 nm, 10 nm and 50 nm in one simulation process simultaneously. The numerical results showed that at the flow de- veloping stage, the particle mass concentration pattern develops as the flow vorticity develops. The distribution is nearly uniform at the lower reaches of the nozzle exit. When the jet flow is developing on, vortexes always carry the particle from upstream to downstream, from the central axis region to the outer mixing layer of jet. At the front of the jet flow, particles distribute more homogeneous for they have more residence time to diffuse from higher concentration region to the lower concentration region. The time averaged particle concentration distribution patterns are similar to Gaussian distribution form. The maximum concentration contributed by diffusion is present at the mixing layer near the nozzle exit. The farther away from the nozzle exit in the cross-stream direction, the smaller the concentration is. The maximum concentration contributed by diffusion is several orders smaller than that contributed by flow convection.

关键词： Large Eddy Simulation Planar Jet Flow Nanoparticle Evolution Diffusion

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关于研究生德育创新的若干思考

中国高教研究 2008年第1期 27-28页

作者：吴迪冲浙江财经学院工商管理学院副教授浙江杭州310012

从分析研究生群体的特殊性出发,探讨了研究生思想道德存在的"知行不一"现象及其可能原因,最后提出了研究生思想道德教育创新的建议措施。

关键词：研究生群体德育创新道德存在教育创新思想道德

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服装大批量定制企业订单实施绩效的衡量

纺织学报 2010年第6期31卷 150-154页

作者：罗昊李仁旺朱泽飞吴迪冲浙江理工大学先进制造研究所浙江杭州310018 浙江财经学院工商管理学院浙江杭州310018

为促进我国服装企业有效实施大批量定制,针对服装大批量定制企业订单实施绩效分析这个新领域。把服装企业生产过程信息与绩效方法结合运用到订单实施过程中,通过对服装大批量定制企业服装生产各环节进行分析,提出了服装大批量定制企业... 详细信息

为促进我国服装企业有效实施大批量定制,针对服装大批量定制企业订单实施绩效分析这个新领域。把服装企业生产过程信息与绩效方法结合运用到订单实施过程中,通过对服装大批量定制企业服装生产各环节进行分析,提出了服装大批量定制企业订单实施绩效衡量的数学模型。该方法对产品生产和售后服务2方面进行订单跟踪和客户满意度评估,及时反馈订单实施程度信息及客户满意信息,使企业不断发现问题,进行资源补偿,使订单顺利实施并不断完善订单优化设计。通过具体例子说明了该方法的合理性和有效性。

关键词：服装大批量定制企业订单实施绩效衡量优化设计数学模型