第308回化学システム工学専攻公開セミナー（第2回レジリエンス工学インターナショナルセミナー） マルチスケール・マルチフィジクスシミュレーション “Particle shape effect on packing and flow behavior of granular materials” “Numerical study of particle-fluid flows: From fundamentals towards industrial applications”
- 日時
- 2017年12月13日（水） 13:00～14:45
- 場所
- 東京大学工学部8号館502輪講室
| 講演題目 | マルチスケール・マルチフィジクスシミュレーション “Particle shape effect on packing and flow behavior of granular materials” “Numerical study of particle-fluid flows: From fundamentals towards industrial applications” |
|---|---|
| 講演者 | Dr. Zongyang Zhou Senior Lecturer, Monash University Dr. Shibo Kuang Reseach Fellow, Monash University |
| 概要 | "Granular Flow in Particulate Systems with Ellipsoidal Particles" by Dr. Zongyan Zhou Particle shape is one of the most important properties of particles, and it affects the packing and flow structures that are critical to transport properties such as permeability related to pore connection and thermal conductivity related to particle connection. Particle shape can be regular or irregular. To be more quantitative, recent studies are focused on particles of well-defined shapes. In particular, ellipsoids have attracted a lot of attention in recent years as it can represent a large number of shapes, e.g. from platy to elongated. In this paper, we give a brief review of our research on ellipsoidal particles on the basis of discrete element method, and examine the effects of particle shapes in some typical particulate systems, including: (1) particle packing, focusing on how aspect ratio affects packing density and structure for coarse and fine ellipsoids; (2) granular flow in hopper and rotating drums, demonstrating the dependence of discharging rate of hopper flow on particle shapes, and flow regimes with particle shape varying; (3) sandpile formation, focusing on how aspect ratio affects the angle of repose, stress dip distribution and segregation; and (4) gas or liquid fluidization, illustrating how particle shape affects the bed permeability, orientation, and bed flow/force structures. The results show that discrete element method for ellipsoids provides a useful approach to investigate shape effect on the behavior of granular materials, and elucidate the further understanding of granular flow in particulate systems. "Numerical study of particle-fluid flows: From fundamentals toward industrial applications" by Dr. Shibo Kuang Understanding and quantifying the particle-fluid flows are of paramount importance to the design, control and optimization of particulate and multiphase processes widely encountered in many industries. It represents a longstanding challenge in the multiphase research community. In recent years, numerous numerical approaches have been developed to tackle this challenge at different time and length scales, with the support of experimental measurements. These approaches, for particles, can be at a sub-particle scale (e.g. lattice Boltzmann simulation), a particle scale (e.g., discrete element method), or a macro scale (e.g. two-fluid model). In this talk, we will discuss our efforts in developing and applying different scaled approaches to understand the fundamentals underlying particle-fluid flows as well as quantify the effects of some pertinent variables on the flows and performance, which aims at achieving efficient flow systems associated with different engineering processes, ultimately. The particles involved can be solid particles, solute dissolved in water, droplets, or bubbles. The focuses will be on particle transportation by a Newtonian or non-Newtonian fluid, particle separation by hydrocyclones or during water desalination, and reacting flow in ironmaking blast furnaces. Also, future developments will be briefly discussed. 備考： オーストラリア・Monash大学のZongyang Zhou博士、Shibo Kuang博士をお招きしてのセミナーを、レジリエンス工学研究センター（担当：酒井幹夫准教授）主催、当専攻共催という形で開催します。 詳細はこちらをご覧ください。 |
| 世話人 | 杉山 弘和（内線27227） |