Multiscale CFD Simulations of Fluidization Dynamics: Bubbles, Mixing and Reactor Scaling
讲座名称：
Multiscale CFD Simulations of Fluidization Dynamics: Bubbles, Mixing and Reactor Scaling
讲座时间：
2017-09-04
讲座人：
Ahmed F. Ghoniem
形式：
校区：
兴庆校区
实践学分：
讲座内容：
应动力工程多相流国家重点实验室副主任白博峰教授的邀请，美国麻省理工学院Ahmed F. Ghoniem教授将于9月4日（周一）在我校进行访问交流并举办两场学术讲座，欢迎感兴趣的老师和同学参加。
讲座一：
讲座题目：Multiscale CFD Simulations of Fluidization Dynamics: Bubbles, Mixing and Reactor Scaling
讲座时间：9月4号上午10:30-11:50
讲座地点：北二楼2楼会议室
Abstract: Fluidized bed reactors find many applications in the energy and chemical industries, including combustion, gasification and catalytic reactors, because of their superior mixing characteristics. Experimental studies of these reactors are hampered by an environment hostile to most diagnostics, and optimal design especially for new applications is a significant engineering challenge. CFD offers a promising alternative. We will discuss recent development in approaches using the two-fluid model, offering a balance between computation efficiency and accuracy. Following a discussion of its fundamentals, we will show how critical submodels for particle-scale dynamics and their interactions with the gas and reactor walls are constructed and validated, and how computational schemes are improved achieving efficiency that allows for practical scale simulations. Results are used to examine bubble dynamics and coalescence, and their impact on solids mixing. Novel computational diagnostics are proposed and applied to discern gas flow distribution, mixing time scales and impact of design and operating conditions on fuel conversion. Results are also used to develop new scaling and reduced models. The use of discrete element methods to develop elaborate submodels is reviewed.
联系人：白博峰教授，电话82665316，邮箱bfbai@mail.xjtu.edu.cn
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