流体工学部門講演会講演論文集
Online ISSN : 2424-2896
セッションID: 1409
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1409 Shear-induced fluid-tracer diffusion in a semidilute suspension of spheres
石川 拓司山口 隆美
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We calculated tracer diffusion in a sheared suspension of non-Brownian rigid spheres and propose a new numerical method based on a boundary element method and Stokesian dynamics method. We present details of the numerical method and examine the accuracy of the method. The limitation of semi-diluteness is due to the accuracy of tracer velocity calculation. The results show that the diffusivity of fluid tracers is greater than that of suspended spheres in the semi-dilute regime. The diffusivity of velocity gradient direction is about threefold greater than that in the vorticity direction. Simple scaling demonstrates that the diffusivity of fluid tracers increases with the square of the volume fraction of spheres in the semi-dilute regime, which is confirmed numerically.
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© 2009 一般社団法人 日本機械学会
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