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Precise electrochemical machining (PEM) is an innovative machining technology which results from further development of the electrochemical sinking. PEM works with pulsed low frequency direct current and oscillation of the tool electrode. As part of the project ‘Electrochemical machining ... Mehr lesen
Vertical circulation wells (VCWs) are well system consisting dual-screened sections allowing synchronous extraction and injection of groundwater in a single borehole. Vertical circulation flow or dipole flow is induced. This type of well has been widely used for in-situ remidiation, ... Mehr lesen
Ohmic heating (Joule heating) is a volumetric heating technology which can effectively process almost any pumpable fluid with extremely high energy efficiency (>95%). This is particularly useful for very thick fluids, those that burn on to hot surfaces and those with high solids content ... Mehr lesen
A installation caused severe hum, with 30 Hz as dominant frequency, causing serious annoyance. The acoustic study showed resonances around 30 Hz. Poor flow conditions existed at the inlet and outlet of the forced draft fan. Flow patterns were studied using CFD. Both the inlet and ... Mehr lesen
High-intensity discharge lamps will in the foreseeable future be important light sources despite a growing market share of LEDs. Cost and energy efficient high frequency (300 kHz) operation is hampered by the excitation of acoustic resonances inside the arc tube, which results in low ... Mehr lesen
Hydrocyclones are industrial devices used as processing units in fluid and particle technology. A hydrocyclone is an apparatus consisting of a cylindrical or a cylindrical-conical body with a tangential or involute entrance to admit the fluid inside. There are also two opposite exits, ... Mehr lesen
Metal foams are interesting materials with many potential applications. They are characterized by a cellular structure represented by a metal or metal alloy and gas voids inside (Fig.1). A common metallic cellular material is aluminum foam which can be produced metallurgically by heating ... Mehr lesen
优先流作为结构性土壤水分入渗的主要方式，影响着作物对降水以及灌溉用水的利用效率，同时影响污染物在土壤中的迁移过程。虫洞等大孔隙是产生优先流的重要因素，准确评估优先流运动对于土壤入渗的研究具有重要意义。本文主要借助COMSOL Multiphysics软件，探索虫洞的存在对土壤水分入渗的影响。我们结合熔锡灌注法和三维激光扫描法，从田间土壤中提取到真实的虫洞三维结构，然后将真实的虫洞3D结构导入COMSOL5.5中，构建土壤入渗模型。该模型主要用到多孔介质和地下水流模块的理查德方程，其中土体主要由虫洞和土壤基质两部分构成 ... Mehr lesen
晶粒细化可有效减少金属凝固组织内部缺陷、提升产品质量。在钢铁冶金领域，通过脉冲磁场干预金属凝固过程以促使凝固组织发生细化是一类常见的手段。近年来人们针对脉冲磁场细晶机制提出诸多机理，为了揭示哪种或哪些机理起主要作用，有必要对脉冲磁场作用下金属熔体内部电磁效应进行研究。本文利用COMSOL Multiphysics中的磁场、流场（k-ε）和动网格技术，对模铸和连铸条件下脉冲磁场在圆柱形金属熔体内产生的磁场、感应电流、电磁力和流场进行仿真模拟研究。研究揭示了电磁场随时间演变规律，以及熔体在电磁力作用下的流动规律。研究表明磁场主要以竖直分量为主 ... Mehr lesen
摘要：本文通过数值模拟分析研究了高效空气过滤器的阻力与PPI、滤纸褶高之间的关系。研究表明，在一定条件下，增加PPI和增加滤纸褶高都可以增大过滤面积，减小滤纸阻力，但同时会增大高效空气过滤器结构阻力，因此滤纸存在最佳的PPI或褶间距和褶高使过滤器的阻力最低。不同的滤纸有不同的最佳结构参数。本文采用数值模拟方法对高效过滤器的阻力进行模拟，经与实测数据对比表明，误差低于10%，模拟方法可行。同时，通过对某款滤纸制成的高效过滤器进行了模拟分析，讨论了PPI和褶高对高效过滤器阻力的影响。最后建立了通用数值分析方法，通过更改相关设定参数，快速计算高效过滤器的阻力 ... Mehr lesen