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Solutions of Potential Fields Using Flexible Finite Element Methods with Applications in Flow Through Porous Media and Electrospinning

机译：利用柔性有限元方法求解势场及其在多孔介质流动和静电纺丝中的应用

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摘要

Filtration technology has found extensive applications in a variety of industries such as oil and gas, aerospace, automotive, agriculture, food processing and pharmaceutical industries. While numerous experimental approaches have been used to optimize the filtration performance, modeling approach is playing an increasingly important role in filtration research as a complimentary tool to experiments. In gas-liquid filtration, a coalescing filter medium is installed in a holder placed in the middle of a long pipe in which the aerosol mixed gas flow passes through porous medium to get purified with aid of filter. Modeling the whole process requires the development of a coupled flow model that describe the flow dynamics in both free channel and porous media flow domain. A flexible finite element method using FlexPDE(TM); software was applied to simulate the flow field such as velocity and pressure profile in the full coupled flow domain including the interface between free channel and porous media. Multiphase transport theory was introduced to set up property balance equations to model the species balance for different types of substances in gas and liquid phase.;In this research, a feasible and effective approach has been proposed to model coupled free channel and porous medium flows over a wide range of permeabilities. In further study, a dynamic simulation of spatial and temporal transport phenomenon of aerosols through free channel and filter medium was developed on the basis of coupled flow model to describe the start-up and loading stage of gas-liquid filtration. A series of parametric study were carried out to evaluate the influence of a variety of factors on filtration performance. Modeling of coalescence phenomenon was also investigated and some preliminary results showed a replication of 'U' shape saturation profile during filtration process. This work contributes to a better understanding of coalescing filtration in terms of flow dynamics for different species, time-dependent saturation profile and mechanism of drop coalescence.;Another application of FlexPDE simulation assisted in a precise and controlled production of electrospun nanofibers by modeling the 3 dimensional electrostatic field to forecast the trajectory of electrospinning jets. The model predictions achieved a good agreement with experimental results, demonstrating an effective computational approach to improve the production efficiency in electrospinning process.
机译：过滤技术已在石油和天然气，航空航天，汽车，农业，食品加工和制药工业等各种行业中得到广泛应用。尽管已使用许多实验方法来优化过滤性能，但建模方法作为实验的辅助工具在过滤研究中发挥着越来越重要的作用。在气液过滤中，将聚结的过滤介质安装在长管中间的支架中，气溶胶混合气流在其中穿过多孔介质，借助过滤器进行净化。对整个过程进行建模需要开发耦合流动模型，该模型描述自由通道和多孔介质流动域中的流动动力学。使用FlexPDE™的灵活的有限元方法；应用软件在全耦合流域（包括自由通道和多孔介质之间的界面）上模拟流场，例如速度和压力分布。引入多相输运理论建立属性平衡方程，为气相和液相中不同类型物质的物种平衡建模。广泛的渗透性。在进一步的研究中，在耦合流模型的基础上，建立了气溶胶通过自由通道和过滤介质的时空迁移现象的动态模拟，以描述气液过滤的启动和加载阶段。进行了一系列参数研究，以评估各种因素对过滤性能的影响。还研究了聚结现象的建模，一些初步结果表明在过滤过程中复制了“ U”形饱和度曲线。这项工作有助于从不同种类的流动动力学，随时间变化的饱和度分布和液滴聚结机理方面更好地了解聚结过滤。; FlexPDE模拟的另一种应用通过对3种模型进行建模，有助于精确和受控地生产电纺纳米纤维。维静电场，以预测静电纺丝射流的轨迹。该模型的预测与实验结果很好地吻合，证明了一种有效的计算方法可以提高电纺过程中的生产效率。

著录项

  • 作者

    Li, Yalong.;

  • 作者单位

    The University of Akron.;

  • 授予单位 The University of Akron.;
  • 学科 Chemical engineering.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 188 p.
  • 总页数 188
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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