Modified Mason number for charged paramagnetic colloidal suspensions.
Modified Mason number for charged paramagnetic colloidal suspensions.
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带电顺磁胶体悬浮液的修正梅森数。
DOI：
10.1103/physreve.93.062603
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
S. Biswal
中科院分区：
文献类型：
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作者：
Di Du;Elaa Hilou;S. Biswal
磁流变流体的动力学通常用梅森数来描述，梅森数是一个控制参数，定义为流体中粘性力和磁力之间的比率。对于大多数磁性颗粒的实验悬浮液，表面力（例如空间相互作用和静电相互作用）可以显着影响动力学。在这里，我们提出了一种修正梅森数理论，该理论解释了表面力，并表明该修正梅森数是粒子间距离的函数。我们证明，这种修改后的梅森数可以准确地描述高盐溶液或低盐溶液中尺寸相同或不匹配的一对旋转顺磁性胶体的动力学。对于在旋转过程中经历稳定-亚稳态转变的粒子对和粒子链来说，修正的梅森数被证实是伪常数。 The interparticle distance term can be calculated using theory or can be measured experimentally. This modified Mason number is more applicable to magnetorheological systems where surface forces are not negligible.
The dynamics of magnetorheological fluids have typically been described by the Mason number, a governing parameter defined as the ratio between viscous and magnetic forces in the fluid. For most experimental suspensions of magnetic particles, surface forces, such as steric and electrostatic interactions, can significantly influence the dynamics. Here we propose a theory of a modified Mason number that accounts for surface forces and show that this modified Mason number is a function of interparticle distance. We demonstrate that this modified Mason number is accurate in describing the dynamics of a rotating pair of paramagnetic colloids of identical or mismatched sizes in either high or low salt solutions. The modified Mason number is confirmed to be pseudoconstant for particle pairs and particle chains undergoing a stable-metastable transition during rotation. The interparticle distance term can be calculated using theory or can be measured experimentally. This modified Mason number is more applicable to magnetorheological systems where surface forces are not negligible.