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浙江大学学报(工学版)
浙江大学学报(工学版)  2019, Vol. 53 Issue (7): 1237-1251    DOI: 10.3785/j.issn.1008-973X.2019.07.002
机械与能源工程     
微反应器计算流体力学与离散元建模及调控
郑帅,谭大鹏*(),李霖,朱吟龙
浙江工业大学 机械工程学院，浙江 杭州 310014
Ultrasonic coupled microreactor CFD-DEM dynamic modeling and regulating method
Shuai ZHENG,Da-peng TAN*(),Lin LI,Yin-long ZHU
College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
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摘要：

为了提高微反应器内部流场均匀性，抑制固相颗粒团聚，提出超声波耦合流场强化调控方法. 基于计算流体力学与离散元耦合（CFD-DEM）方法，建立微反应器流体动力学模型，得到微反应器流道的多相流场分布与颗粒运动规律. 对可实现k-ε湍流模型源项进行修正，得到微型反应器在超声波激振作用下的颗粒碰撞冲击效应与内部流场非线性分布特征. 结合分形方法，对流道中的颗粒群混沌态分布进行定量分析. 以T形汇流反应器为例，开展数值仿真研究. 结果表明，超声波耦合流场强化可以提高反应器内的流场分布均匀性，对离散颗粒团聚进行有效的抑制.
关键词： 微型反应器;  超声波激振;  计算流体力学与离散元耦合（CFD-DEM）;  颗粒团聚;  分形方法    
Abstract:

An ultrasonic coupled flow flied regulating method was proposed in order to improve the microreactor flow field uniformity and restrain the particle aggregation. A fluid mechanic model for microreactor internal flow field was constructed based on the computational fluid dynamics and discrete element method (CFD-DEM), and the regularities of multiphase flow field and particle motion were obtained. The particle collision effects and nonlinear flow field profiles of microreactor channels under ultrasonic excitation were acquired by revising the source item of the realizable k-ε turbulence model. The chaotic states of particle groups were analyzed by the fractal method. The numerical simulations were conducted by taking the T shape confluence microreactor as an instance. Results show that the proposed method can improve the internal flow field uniformity of microreactor, and can restrain the phenomenon of particle aggregation.
Key words: microreactor    ultrasonic excitation    computational fluid dynamics and discrete element method (CFD-DEM)    particle aggregation    fractal method
收稿日期: 2018-10-10 出版日期: 2019-06-25
CLC:  O 359  
通讯作者: 谭大鹏     E-mail: tandapeng@zjut.edu.cn
作者简介: 郑帅（1992?），男，硕士生，从事双向流固耦合、机电液一体化系统调控研究
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郑帅
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引用本文:

郑帅,谭大鹏,李霖,朱吟龙. 微反应器计算流体力学与离散元建模及调控[J]. 浙江大学学报(工学版), 2019, 53(7): 1237-1251.

Shuai ZHENG,Da-peng TAN,Lin LI,Yin-long ZHU. Ultrasonic coupled microreactor CFD-DEM dynamic modeling and regulating method. Journal of ZheJiang University (Engineering Science), 2019, 53(7): 1237-1251.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.07.002    或    http://www.zjujournals.com/eng/CN/Y2019/V53/I7/1237

图 1  微反应器流道结构简图
图 2  微反应器流场识别分形处理流程
图 3  CFD-DEM耦合数值模型计算流程
图 4  网格无关性验证
图 5  超声加载作用下流场参数变化曲线
图 6  未加载超声波作用下的流道速度云图
图 8  加载超声波作用下的流道速度云图
图 9  加载超声波作用下的流道动压云图
图 7  未加载超声波作用下的流道动压云图
图 10  不同激振频率下的流场分布曲线
图 11  未加载超声波微反应器管道颗粒分布
图 12  加载超声波微反应器管道颗粒分布
图 13  特征点颗粒的体积分数
图 14  特征点颗粒的速度曲线
图 15  未加载超声波管道交汇处颗粒分布分形维数
图 16  未加载超声波管道弯折处颗粒分布分形维数
图 17  加载超声波管道交汇处颗粒分布分形维数
图 18  加载超声波管道弯折处颗粒分布分形维数
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