摘要
本文采用离散元气固耦合数值模拟方法(DEM-CFD)对不同长径比的杆状颗粒在气相中的流化过程进行了数值模拟研究。本文在宏观上分析了杆状颗粒的流动结构和床体的压降特性,并从微观上探究了杆状颗粒取向角的变化规律。结果表明,在气泡边沿处,杆状颗粒的主轴和气泡轮廓趋向一致。同时,长径比越大,床体发生流化所需的最大压降就越小,但也越加难以流化。另外,随着气流速度的增加,不同长径比下颗粒平均取向角间的差异逐渐减小。
Employing the coupling simulation of discrete element method and computational fluid dynamics （DEM-CFD）, the gas fluidization of rodlike particles with different aspect ratios is investigated. The emphasis is focused on the flow pattern of rods and pressure drop of the bed in macroscopic level as well as the orientation of rods in microscopic level. The results show that the principal axesof rods tend to align with the contours of the bubbles. With the increase of the aspect ratio, the minimum pressure drop for fiuidization decreases and the bed becomes more difficult to be fluidized. It also shows that the differences of the mean orientation angles between rods withdifferent aspect ratios become less significant as the gas velocity increases.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2015年第9期1942-1946,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金重点项目(No.51134003)
国家自然科学基金创新研究群体(No.51121092)
关键词
杆状颗粒
离散元
计算流体力学
流化
rodlike particles
discrete element method
computational fluid dynamics
fluidization
