DLD装置中刚性颗粒运动的直接数值模拟研究  

Direct numerical simulation of motion of rigid particle in a deterministic lateral displacement device

作　　者：喻文广[1] 余钊圣[1] 叶尚军[1] 邵雪明[1] 王博康[1] 

机构地区：[1]浙江大学力学系,浙江杭州310027

出　　处：《机电工程》2013年第7期778-782,共5页Journal of Mechanical & Electrical Engineering

基　　金：国家自然科学基金资助项目(11072217;11202185)

摘　　要：为解决确定性侧向位移分离装置(DLD)数值模拟的精度以及其颗粒分离规律等问题,将直接力虚拟区域法应用到刚性颗粒在DLD中的运动直接数值模拟中。开展了DLD装置的侧向边界条件的影响分析,建立了侧向边界条件与DLD内部流场倾斜角度之间的关系,提出了对于模拟侧向圆柱数量较多的实际DLD装置应该采用周期性边界条件;在流场特征和刚性颗粒分离半径上对所采用的数值模拟方法和侧向边界条件进行了评估和实验。研究结果表明,对于侧向有较多数量圆柱的实际DLD装置,采用较少数量的圆柱和周期性边界条件来减少计算量,可以保证数值模拟的精度。In order to solve the problems of the accuracy of numerical simulation of deterministic lateral displacement （DLD） device and study of particle separation, a direct numerical simulation method （i. e. fictitious domain method） was used to simulate the motion of rigid particle in DLD. After the analyzing the effects of lateral boundary condition, the relationship of internal flow field tilt angle and boundary conditions were established. The periodic boundary conditions were presented to simulate DLD with a huge number of lateral arrays. The nu- merical method and boundary condition were evaluated on a characteristic of the internal flow field and the separation diameter. The critical diameter of a rigid particle in DLD was tested. The experimental results show that for the practical DLD devices with a huge number of lateral arrays, the periodic boundary condition with fewer arrays can be adopted to reduce the computational cost.

关 键 词：确定性侧向位移 虚拟区域法 颗粒分离 临界直径 

分 类 号：TQ051.8[化学工程] TH237.5[机械工程—机械制造及自动化]