Satoh A, Coverdale GN, Chantrell RW
Department of Machine Intelligence and System Engineering, Faculty of System Science and Technology, Akita Prefectural University, 84-4, Ebinokuchi, Tsuchiya-aza, Honjo, 015-0055, Japan
J Colloid Interface Sci. 2000 Nov 15;231(2):238-246. doi: 10.1006/jcis.2000.7118.
We have conducted Stokesian dynamics simulations to investigate the dynamic properties of ferromagnetic colloidal dispersions subjected to a sinusoidal shear flow. Thick chain-like cluster formation is significantly influenced by an oscillatory shear flow even if the amplitude is relatively small, since the internal structures of thick chain-like clusters are highly sensitive to the change in the direction of the shear flow. The motion of thick chain-like clusters is out of phase to a sinusoidal shear rate, and the phase difference is strongly correlated with that of the viscosity and normal stress coefficients. The viscoelastic properties become more apparent with decreasing frequency of the oscillatory shear flow, since such properties have a strong relationship with the thick chain-like cluster formation. In other words, since thick chain-like clusters are more stable for the case of a smaller frequency shear flow, such stable clusters induce significant viscoelastic properties of ferromagnetic colloidal dispersions in a strong, applied magnetic field. Copyright 2000 Academic Press.
我们进行了斯托克斯动力学模拟，以研究在正弦剪切流作用下铁磁胶体分散体的动力学性质。即使振幅相对较小，振荡剪切流对厚链状聚集体的形成也有显著影响，因为厚链状聚集体的内部结构对剪切流方向的变化高度敏感。厚链状聚集体的运动与正弦剪切速率异相，且相位差与粘度和法向应力系数的相位差密切相关。随着振荡剪切流频率的降低，粘弹性性质变得更加明显，因为这些性质与厚链状聚集体的形成有很强的关系。换句话说，由于厚链状聚集体在较低频率剪切流的情况下更稳定，这种稳定的聚集体在强外加磁场中会使铁磁胶体分散体表现出显著的粘弹性性质。版权所有2000年学术出版社。
