Microstructure of the fluid particles around the rigid body at the shear-thickening state toward understanding of the fluid mechanics

Ryota Jono; Syogo Tejima; Jun-Ichi Fujita

doi:10.1038/s41598-021-03714-w

Microstructure of the fluid particles around the rigid body at the shear-thickening state toward understanding of the fluid mechanics

Sci Rep. 2021 Dec 17;11(1):24204. doi: 10.1038/s41598-021-03714-w.

Authors

Ryota Jono¹, Syogo Tejima², Jun-Ichi Fujita³

Affiliations

¹ Research Organization for Information Science and Technology, 7F, Sumitomo-Hamamatsucho Building, 1-18-16, Hamamatsucho, Minato-ku, Tokyo, 105-0013, Japan. jono@rist.or.jp.
² Research Organization for Information Science and Technology, 7F, Sumitomo-Hamamatsucho Building, 1-18-16, Hamamatsucho, Minato-ku, Tokyo, 105-0013, Japan.
³ Institute of Applied Physics, Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 1-1-1 Ten-nodai, Tsukuba, Ibaraki, 305-8573, Japan.

Abstract

We studied the shear-thickening behavior of systems containing rigid spherical bodies immersed in smaller particles using non-equilibrium molecular dynamics simulations. We generated shear-thickening states through particle mass modulation of the systems. From the microstructures, i.e., two-dimensional pair distribution functions, we found anisotropic structures resulting from shear thickening, that are explained by the difference between the velocities of rigid bodies and fluid particles. The increasing viscosity in our system originated from collisions between fluid particles and rigid bodies. The lubrication forces defined in macroscale physics are then briefly discussed.