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Dissipative Particle Dynamics Simulations of Domain Growth and Phase Separation in Binary Immiscible Fluids
Ying Zhao,Hong Liu,Zhong-yuan Lu*,Chia-chung Sun
Author NameAffiliationE-mail
Ying Zhao State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China  
Hong Liu State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China  
Zhong-yuan Lu* State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China luzhy@mail.jlu.edu.cn 
Chia-chung Sun State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China  
Abstract:
It was investigated that the domain growth processes of spinodal decomposition with different quenching depth in two and three dimensional binary immiscible fluids by using parallel dissipative particle dynamics simulations. In two dimensions, the dynamic scaling exponent 1/2 for coalescence and 2/3 for inertial regimes in the shallow quench and strong finite size effects in the cases of deep quenching were obtained. In three dimensions, it was used that the diffusive regime with exponent n=1/3 in the shallow quench and the inertial hydrodynamic regime with n=2/3 for different quenches. The viscous effects are not clearly reflected, showing n=1/2 in both shallow and deep quenches in this time period, due to the soft nature of interaction potential adopted in dissipative particle dynamics.
Key words:  Dissipative particle dynamics, Binary immiscible fluids, Domain growth
FundProject:
Dissipative Particle Dynamics Simulations of Domain Growth and Phase Separation in Binary Immiscible Fluids
赵英,刘鸿,吕中元*,孙家钟
摘要:
用并行耗散粒子动力学方法研究了二维和三维体系中不同淬火深度下二元不相容流体旋节线分离的相区增长过程. 在二维体系中,在浅度淬火条件下得到了动力学标度指数为1/2的融合机制和2/3的惯性流体动力学机制,在深度淬火情况下发现了有限尺寸效应. 在三维体系中,浅度淬火条件下n=1/3的扩散机制和两种不同淬火深度下n=2/3的惯性流体动力学机制. 由于耗散粒子动力学软相互作用势的本质,所以粘性效应无法被清晰地反映,在该时间区间里,不论是浅度还是深度淬火都表现出n=1/2的指数关系.
关键词:  耗散粒子动力学,二元不相容流体,相区增长
DOI:10.1088/1674-0068/21/05/451-456
分类号: