小尺度颗粒在液固两相流体中的迁移特性研究

发布时间：2018-04-14 10:06

本文选题：小尺度 + 颗粒物　；参考：《中国海洋大学》2015年硕士论文

【摘要】：小尺度颗粒物在液固两相流场中迁移特性的研究涉及到流体力学、流体动力学等多个学科的内容。本文在前人研究的基础之上,对研究对象进行了合理的简化和分析,分别从理论和实验两个角度对小尺度颗粒物在液固两相流体中的迁移特性展开了研究。在理论研究方面,本文从小尺度颗粒物在流场中受力情况为切入点,经过分析建立其在流场中的控制方程,得到了小尺度颗粒物在水平流场中运动情况的表达式：为了便于求解小尺度颗粒物的运动方程,对颗粒在流场中受到的各个力进行了比较,在合适的情况下,忽略了Magnus升力和Saffman升力对颗粒运动的影响,同时对Basset力构建了合适的计算格式,最后采用MATLAB软件对方程进行了编程求解。同时,本文对影响小尺度颗粒物在流场中运动的各个因素,例如颗粒的密度、流场的密度、颗粒直径、流场温度等多个因素进行了相关的研究,同时对得到的理论结果进行了合理的分析。特别对颗粒形状对颗粒运动的影响采用Fluent软件进行了模拟,得到了形状因子对颗粒运动的影响。在实验研究方面,本文基于数字全息技术,搭建了小尺度颗粒在流场中运动观测平台,通过实验测试,并使用相关的软件对实验得到的数据和图像进行分析,充分证明该平台可以实现对小尺度颗粒物在液固两相流场中迁移特性的研究。这位后续复杂流场中小尺度颗粒物的迁移和扩散特性的观测提供了良好的参考。本文通过现有的理论和实验研究,表明针对小尺度颗粒物在液固两相流场中迁移特性的研究是可行的,同时对后续在复杂流场中小尺度颗粒物迁移特性的研究奠定了基础。
[Abstract]:The study on the transport characteristics of small scale particles in liquid-solid two-phase flow field involves many subjects, such as hydrodynamics, hydrodynamics and so on.On the basis of previous studies, this paper makes a reasonable simplification and analysis of the objects of study, and studies the migration characteristics of small scale particles in liquid-solid two-phase fluids from the theoretical and experimental perspectives.In terms of theoretical research, the control equations of small scale particulate matter in the flow field are established by analyzing the force acting on the particle in the flow field.In order to solve the equation of motion of small scale particles in the horizontal flow field, the forces applied to the particles in the flow field are compared, and under suitable conditions, the expression of the motion of the particles in the horizontal flow field is obtained.The influence of Magnus lift and Saffman lift on particle motion is ignored. At the same time, a suitable calculating format for Basset force is constructed. Finally, the equation is solved by MATLAB software.At the same time, various factors affecting the movement of small scale particles in the flow field, such as particle density, flow field density, particle diameter, flow field temperature and so on, are studied in this paper.At the same time, the theoretical results are analyzed reasonably.Especially, the effect of particle shape on particle motion is simulated by Fluent software, and the influence of shape factor on particle motion is obtained.In the aspect of experimental research, based on the digital holography technology, a small scale particle motion observation platform in the flow field is built, and the experimental data and images are analyzed by using the related software.It is fully proved that the platform can be used to study the migration characteristics of small-scale particles in liquid-solid two-phase flow field.The observation of the transport and diffusion characteristics of mesoscale particles in the complex flow field provides a good reference.Based on the existing theoretical and experimental studies, it is shown that the study on the transport characteristics of small scale particles in the liquid-solid two-phase flow field is feasible, and the basis for the subsequent study of the characteristics of small and medium-sized particle transport in complex flow fields is established.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O359

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