基于CFD-DEM算法的气力输送气固两相流特性分析

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中文摘要：超轻粉体颗粒由于质量较小，在运输过程中易受气流扰动而飘散，物料的管道气力输送过程不稳定，易发生堵塞。为了研究超轻粉体颗粒在旋流气力输送中气固两相流流动特性，采用计算流体力学与离散单元法(CFD-DEM)，对Komax型静态混合器内气固两相流动特性进行数值模拟研究。研究发现，带有Komax型元件的水平管道可以改变颗粒的流动情况，改善了水平管道内颗粒堆积和分布不均匀的现象;分别从颗粒相和流体相的流动状态分析得到元件长径比Ar=3时为最优几何结构;通过正交实验极差分析得到影响气固两相流动特性的因素顺序:输送气速＞颗粒质量流量＞颗粒粒径。当元件Ar=3时，颗粒-颗粒和颗粒-管壁的碰撞次数与碰撞强度呈现负相关，结合出口颗粒流分散状态，优选输送气速为3～4m/s;主要考虑输送气速对管内压降的影响，提出了带有Komax型元件的水平管道气力运输过程中压降与输送气速和轴向位置的经验拟合式。

外文标题：Characteristics analysis of gas solid two-phase flow in pneumatic conveying based on CFD-DEM algorithm

外文摘要：Because of its light weight,ultra-light powder particles are easily disturbed by airflow in the process of transportation,and the pipeline pneumatic conveying process of material is unstable and prone to blockage.To study the gas-solid two-phase flow characteristics of ultra-light powder particles in cyclone pneumatic conveying,computational fluid dynamics and discrete element method(CFD-DEM)were used to simulate the gas-solid two-phase flow characteristics in Komax static mixer.It was found that the horizontal pipe with Komax elements can change the particles flow state,and improve the accumulation and uneven distribution of particles.From the analysis of the flow state of particle phase and fluid phase,it was concluded that the element aspect ratio Ar=3 was the preferred geometry structure.Through the range analysis of orthogonal experiments,the order of factors affecting gas-solid two-phase flow characteristics was obtained as follows:conveying gas velocity＞particle mass flow rate＞particle size.When the element aspect ratio Ar was 3,the collision frequency and strength of particle-particle and particle-wall were negatively correlated.Combining with the dispersion state of the particle flow at the outlet,the optimal conveying gas velocity was 3-4m/s.Considering the influence of conveying gas velocity on pressure drop in the pipeline,the empirical fitting formula of pressure drop,conveying gas velocity and axial position during pneumatic transportation of horizontal pipeline with Komax element was proposed.

外文关键词：

static mixermultiphase flowdilute phase swirl pneumatic conveyinggranular flowCFD-DEM coupling methodflow characteristic

作者：

禹言芳、石博文、孟辉波、丁鹏程、姚云娟

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作者单位：

沈阳化工大学机械与动力工程学院,辽宁沈阳 110142

中国石油大学(华东)新能源学院,山东青岛 266580

关键词：

静态混合器多相流稀相旋流气力输送颗粒流 CFD-DEM耦合法流动特性

基金：

辽宁特聘教授计划国家自然科学基金辽宁省教育厅高等学校基本科研重点项目辽宁省教育厅高等学校基本科研重点项目辽宁省自然科学基金青岛市自然科学基金中国石油大学(华东)人才引进研究基金

项目编号：

辽教函[2018]35号21476142LJKZ0429LJKMZ202207732022-MS-29023-2-1-236-zyydjchR20220113

出版年：

2024

DOI：

10.16085/j.issn.1000-6613.2023-0353

化工进展

中国化工学会,化学工业出版社

化工进展

CSTPCD北大核心

影响因子：1.062

ISSN：1000-6613

年,卷(期)：2024.43(3)

参考文献量43