Studies on liquid-liquid interfacial tension with standard dissipative particle dynamics method
Studies on liquid-liquid interfacial tension with standard dissipative particle dynamics method
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标准耗散粒子动力学方法研究液-液界面张力
DOI：
10.1080/08927022.2014.952636
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发表时间：
2015
影响因子：
2.1
通讯作者：
Khoo Boo Cheong
中科院分区：
文献类型：
--
作者：
Pan Dingyi;Phan-Thien Nhan;Khoo Boo Cheong
采用标准耗散粒子动力学(DPD)方法，采用两种不同的界面张力测量方法，即欧文-柯克伍德法和液滴回缩法，研究了不相容液-液界面的界面张力。液滴回缩方法预测的界面张力低于欧文-柯克伍德方法预测的界面张力。对于原始的标准DPD方法，不同物种之间的保守参数()在预测界面张力中起着重要的作用。值越小，得到的结果越准确。在标准DPD模拟的界面附近发现了一个低密度的缝隙。为了模拟液滴在拉伸流动中的变形，液滴与其周围流体之间的界面上发现了较大的密度间隙，这被认为是高估界面张力的原因。通过降低原始DPD流体的可压缩性，这两种方法之间的界面张力得到了更好的一致。这也使得它与拉伸流动中液滴变形的实验工作非常一致。
The interfacial tension of immiscible liquid–liquid interface is studied with a standard dissipative particle dynamics (DPD) method, in which two different interfacial tension measuring approaches, ie the Irving–Kirkwood approach and droplet retraction approach, are employed. The droplet retraction approach predicts a lower interfacial tension than that predicted by the Irving–Kirkwood approach. With the origin standard DPD method, the conservative parameter between different species () plays an important role in the prediction of the interfacial tension. The smaller the, the more accurate results are obtained. A low-density gap is found around the interface of the standard DPD simulation with a large. For simulating droplet deformation in elongation flow, the large density gap found on the interface between the droplet and its surrounding fluid is believed to be the reason of the overestimation of the interfacial tension. By reducing the compressibility of origin DPD fluid, a better agreement of the interfacial tensions found between these two approaches to be obtained. It also permits a close agreement with the experimental work for droplet deformation in an elongation flow.