基于耗散粒子动力学的微通道内高分子运动规律研究  

Investigation on the Movement of the Polymer in Microchannel Based on Dissipative Particle Dynamics

作　　者：周昊 李逸飞 范亮亮[2] 赵亮[1] ZHOU Hao;LI Yifei;FAN Liangliang;ZHAO Liang(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;School of Instrument Science and Technology,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]西安交通大学仪器科学与技术学院,西安710049

出　　处：《工程热物理学报》2025年第3期872-878,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52076174)。

摘　　要：本文选用耗散粒子动力学的方法,构建了微通道内长链高分子运动模型,系统研究了高分子链的受限程度、雷诺数和通道结构对单个高分子链构象变化及运动规律的影响。研究发现,在直通道泊肃叶流动中,高分子链的质心分布呈双峰形状,且双峰的位置、峰值与受限程度和雷诺数紧密相关。另外,本文发现调整T型通道的狭缝宽度,可控制不同链长的高分子链通过狭缝的周期,利用该机制可实现不同链长高分子的分离,在生物医学等领域具有应用价值。This paper employs the method of dissipative particle dynamics to construct a model of long-chain polymer motion within microchannels.The effects of polymer chain confinement,Reynolds number,and channel structure on the conformational changes and motion rules of individ-ual polymer chains are systematically studied.The result shows that,in the Poiseuille flow in the straight channel,the distribution of the polymer chain’s center of mass is bimodal,and the position and peak value of the double peaks are closely related to the degree of confinement and Reynolds number.In addition,the period of different chain length polymers passing through the slit can be controlled by adjusting the slit width of the T-shaped channel.Based on this mechanism,the sepa-ration of different chain length polymers can be achieved,which has great potentials in biomedical field.

关 键 词：耗散粒子动力学 微流控 微通道 液固两相流 颗粒分离 

分 类 号：O631.4[理学—高分子化学]