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均质腔内壁微结构对均质性能影响的仿真分析
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作者 董树 史岩彬 荣学青 《食品与机械》 CSCD 北大核心 2017年第2期73-76,105,共5页
基于壁面粗糙度引起流动状态变化的现象,为进一步研究高压均质机内均质腔内壁表面的微结构对均质性能的影响,在光滑均质腔内壁构建沟槽状微结构,采用计算机流体动力学(CFD)技术对均质腔内两相流动过程进行仿真。以APV实验型高压均质机... 基于壁面粗糙度引起流动状态变化的现象,为进一步研究高压均质机内均质腔内壁表面的微结构对均质性能的影响,在光滑均质腔内壁构建沟槽状微结构,采用计算机流体动力学(CFD)技术对均质腔内两相流动过程进行仿真。以APV实验型高压均质机内的均质腔为研究对象,将油-水乳液作为均质物料,分别对光滑均质腔,矩形截面沟槽均质腔,以及三角形截面沟槽均质腔内的均质过程进行仿真计算,并做对比分析。结果表明:有沟槽的均质腔均质粒径更小,而矩形截面沟槽较三角形截面沟槽均质得到的粒径更小,同时粒度分布更均匀,有利于提高均质性能;计算机仿真结果与湍流近壁区理论分析结果趋势一致。 展开更多
关键词 均质腔 湍流近壁区理论 内壁微结构 流体动力学
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Analytical Solution of Helmholtz Equation in Anisotropic and Nonhomogeneous Region
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作者 Dariusz Spalek 《Journal of Energy and Power Engineering》 2014年第7期1265-1271,共7页
The analytical solution of Helmholtz equation for magnetic vector potential in anisotropic and nonhomogeneous region is presented. The solution is built of a combination of both Bessel and power functions. There are d... The analytical solution of Helmholtz equation for magnetic vector potential in anisotropic and nonhomogeneous region is presented. The solution is built of a combination of both Bessel and power functions. There are developed two examples that proof the accuracy of the proposed analytical solution. First example is showing the electromagnetic field analysis in slot of ferromagnetic rotor of electrical induction machine. The second example approaches electromagnetic field wave in resonator of the form of rectangular cavity The analytical solution presented is treated as an exact one and is being compared with the numerical solution, e.g., given by finite element method. The analytical solution can be used as a benchmark test for numerical algorithms, 展开更多
关键词 Helmholtz equation anisotropic and nonhomogeneous region analytical and numerical solutions.
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