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在以压强连接的隐式修正法压力速度校正方程基础上,采用雷诺平均N-S方程以及标准k-ε湍流模型,对水厂沉淀池的三维水流动进行数值模拟和求解。数值模拟结果与沉淀池使用过程出现的污泥沉淀规律较符合。利用理论计算结果对沉淀池的入水口重新进行了合理的结构设计和布局调整。通过分布多个入水口,变化水池的结构,有效地改善了水流特性,减小了连续的沉淀区域面积,有利于后期污泥的排放,证明采用的数值模拟方法对水厂沉淀池的结构改造及优化设计是有助的。 相似文献
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<正> 酸洗车间的污水,铁皮含量达1000毫克/升,中和后推荐在立式沉淀池内澄清。而应用幅射式沉淀池净化上述污水长期以来是有争议的。一些研究人员曾指出,幅射沉淀池泥浆浓缩区体积小时,用于净化酸性含铁皮污水是不可能的,因为这种污水的特点是沉渣体积大。最近使用幅射式沉淀池的兴趣增高,已成功地将它应用于大规模的城市和 相似文献
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结合ASM1和二沉池模型组成活性污泥模拟系统,将某污水处理厂的常规检测数据转化为活性污泥系统模型所需的组分数据,然后调整模型参数,使污水处理厂出水指标最接近于污水处理厂实际数据,从而确定适合该污水处理厂的模型参数,最后对该污水处理厂的工艺参数进行了模拟改造。 相似文献
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Eakarach Bumrungthaichaichan 《Korean Journal of Chemical Engineering》2016,33(11):3050-3068
Over two decades or so, the computational fluid dynamics (CFD) modeling of various jet mixing tank configurations was developed and published. Further, the studies of various parameters used in experimental and CFD works were also reviewed to obtain the optimal design procedure. However, the numerical setup for jet mixing tank modeling was not studied and reported. Hence, in this review paper, the important numerical setup for CFD simulation of jet mixing tanks, including numerical solution techniques, turbulence model selection, boundary conditions, numerical methods, solution strategy, and CFD grid, are clearly demonstrated to achieve the comprehensive CFD modeling guideline for jet mixing tank. Further, the validations for jet mixing tank models are also represented. 相似文献
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以计算流体力学(CFD)技术为基础,对受磷槽内黄磷沉淀及液液两相流动进行数值模拟。模拟结果表明,受磷槽内水相流动状态十分复杂,且流动趋势不受进口流量的影响。黄磷累积量随进口量改变而改变,但黄磷流动速度变化较小。欧拉多相流及k-ε湍流模型能够较好地描述受磷槽内黄磷分布状态及流体流动状态,模拟结果具有较高的可靠性。 相似文献
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搅拌槽内的流场是决定混合、传热及传质等操作的基础,对流场的研究具有十分重要的意义,计算流体动力学是研究流场的重要方法。本文回顾了搅拌数值模型的发展历程,阐述了三十年来各种搅拌流场数值模拟方法的特点及其应用情况,对比分析了各种湍流模型的优缺点,并展望了未来搅拌槽内单相湍流模型的发展方向。 相似文献
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研究建立了2种危险性液体储罐的泄漏源模型及数值方法,通过Visual Basic语言开发了数值模拟软件,结合具体的工程案例进行了数值计算,分析了液面高度、泄漏质量速率、泄漏质量与泄漏时间以及泄漏质量速率、泄漏质量与液面高度的关系,结果表明:建立的模型可以准确描述危险性液体储罐的泄漏过程,且数值模拟软件降低了模型求解时间,具有很强的实用性,从而为危险性液体储罐泄漏事故后果定量风险评价和事故应急救援提供基础数据。 相似文献
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As a part of the initiative Industry 4.0, the level of digitization in the process industry is increasing. Through a close link between analytics and dynamic modeling, digitization enables the optimization in processing industry or the model‐based control. For this purpose, mathematical models of the process level enabling real time simulations have to be known. In the field of solid‐liquid separation the advancing digitization forces the development of numerical flow simulation methods and short‐cut models to deepen process understanding and mathematical process modeling. Resolved flow simulations should be seen as support for experiments to develop suitable dynamic models for short‐cut models. Based on the prerequisites, the development of dynamic process models and their application using the example of solid bowl centrifuges is described. 相似文献