| 涡场中黏附性颗粒团聚体粒径分布的预测 |
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| 引用本文： | 赵昆鹏,Meiburg Eckart,白博峰.涡场中黏附性颗粒团聚体粒径分布的预测[J].工程热物理学报,2022,43(2):414-418. |
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| 作者姓名： | 赵昆鹏 Meiburg Eckart 白博峰 |
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| 作者单位： | 西安交通大学动力工程多相流国家重点实验室,西安710049,美国加州大学圣巴巴拉分校机械工程系,圣巴巴拉CA93106 |
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| 基金项目： | 国家自然科学基金基础科学中心项目(No.51888103)。 |
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| 摘 要： | 黏附性颗粒团聚现象在自然界和工业界普遍存在,扰动流场中黏附性颗粒间的碰撞、摩擦和吸附等动力学行为,导致团聚体形态不断演化,准确预测黏附性颗粒团聚体的粒径分布是调控颗粒团聚过程的重要前提。本文通过二维泰勒格林涡场中黏附性颗粒团聚的数值模拟研究,明确了利用Monte Carlo模型预测团聚体粒径分布的可行性及其适用范围,发现当黏附性颗粒间内聚数小于3.5×10?4时,Monte Carlo模型可较好的预测团聚体粒径分布,且相对误差小于±30%;而当内聚数大于3.5×10?4后,Monte Carlo模型不再适用。
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| 关 键 词： | 黏附性颗粒 粒径分布 泰勒格林涡场 Monte Carlo模型 |
Floc Size Distribution in Steady Vortex Field |
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| ZHAO Kun-Peng,MEIBURG Eckart,BAI Bo-Feng.Floc Size Distribution in Steady Vortex Field[J].Journal of Engineering Thermophysics,2022,43(2):414-418. |
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| Authors: | ZHAO Kun-Peng MEIBURG Eckart BAI Bo-Feng |
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| Institution: | (State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Department of Mechanical Engineering,UC Santa Barbara,Santa Barbara CA93106,USA) |
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| Abstract: | We develop a physical and computational method to directly simulate the flocculation of cohesive particles in cellular flow fields by one-way coupling.The cellular flow consists of Taylor-Green vortices and has been proved to be a simple but robust analytical framework for the study of turbulence,it can capture key features of vortical effects on particles.Our numerical method can separately consider the cohesion,lubrication and direct contact forces for each pair of particles,thereby allowing us to conduct a detailed analysis of their influences on the flocculation process in vortices.By comparing with our numerical results,a previous model based on the Monte Carlo Method is recommended to predict the floc size distribution. |
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| Keywords: | cohesive particle floc size distribution taylor-green vortices monte-carlo method |
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