Maximum Spreading of Impacting Ferrofluid Droplets under the Effect of Nonuniform Magnetic Field
Maximum Spreading of Impacting Ferrofluid Droplets under the Effect of Nonuniform Magnetic Field
复制标题
非均匀磁场作用下撞击铁磁流体液滴的最大扩散
DOI：
10.1021/acs.langmuir.1c03272
复制
发表时间：
2022
期刊：
影响因子：
3.9
通讯作者：
Hiroshi Yamaguchi
中科院分区：
文献类型：
--
作者：
Qian-Ping Li;Yi Ouyang;Xiao-Dong Niu;Youhua Jiang;Ming-Fu Wen;Ze-Qin Li;Mu-Feng Chen;De-Cai Li;Hiroshi Yamaguchi
研究了非均匀磁场作用下铁磁流体液滴撞击疏水表面时的最大扩展。一个广义模型的扩展最大的发展。据观察，如果磁场强度为零，铁磁流体液滴不仅表现出类似的扩展动力学的水滴，但也服从相同的标度律的最大扩展因子。因此，本文强调磁场强度的影响。在这方面，引入无量纲参数（Nm）作为惯性力和开尔文力之间的比率，假设动能主要转化为热能。这个参数使我们能够用Pade 'approximant在一条曲线上重新调整所有实验数据，这适用于广泛的撞击速度和磁场强度。
This article investigates the maximum spreading of ferrofluid droplets impacting on a hydrophobic surface under nonuniform magnetic fields. A generalized model for scaling the maximum spreading is developed. It is observed that, if the magnetic field strength is zero, a ferrofluid droplet not only demonstrates similar spreading dynamics as the water droplet but also obeys the same scaling law for the maximum spreading factor. Therefore, this article emphasizes the effects of magnetic field strength. In this regard, a dimensionless parameter (Nm) is introduced as the ratio between inertial force and Kelvin force, with an assumption that the kinetic energy mainly transforms to thermal energy. This parameter allows us to rescale all experimental data on a single curve with the Padé approximant, which is applicable to a wide range of impact velocities and magnetic field strengths.