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对在稳态剪切流下的一种稀疏界面活性剂溶液进行了布朗动力学数值模拟。棒状的界面活性剂胶束粒子被假定为由圆球线性连接而构成的刚性棒。本文引进了一种新的势作用模型来描述胶束粒子间的相互作用,利用Lennard-Jones势函数来描述棒端部球之间的相互作用,而采用软球势函数来描述棒内部球之间的相互作用。在低剪切率条件下,胶束粒子在端部相互连接而形成网状结构。随着剪切增大,网状构造遭到破坏,胶束粒子趋向与剪切流方向平行。这种溶液微结构随剪切率变化关系导致了溶液剪切粘度和第一正应力差系数的剪切稀化现象。此外,还考察了溶液浓度对剪切粘度和第一正应力差系数的影响。结果表明,剪切粘度和第一正应力差系数均随溶液粘度的增加而增加。
A Brownian kinetic simulation of a dilute surfactant solution under steady state shear flow was performed. Rod-shaped surfactant micelle particles are assumed to be rigid rods made of linearly connected balls. In this paper, we introduce a new potential model to describe the interaction between micelle particles, and use the Lennard-Jones potential function to describe the interaction between rod-end spheres. Interaction between. At low shear rates, micellar particles are interconnected at the ends to form a network. As the shear increases, the net structure is destroyed, and the micellar particles tend to be parallel to the shear flow direction. The microstructure of this solution changes with the shear rate and leads to the shear thinning phenomenon of the solution shear viscosity and the first normal stress difference coefficient. In addition, the influence of solution concentration on the shear viscosity and the first positive stress difference coefficient was also investigated. The results show that the shear viscosity and the first positive stress difference coefficient increases with the increase of solution viscosity.