Drag and Lift Forces Acting on a Spherical Bubble in Homogeneous Shear Flow

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  • SUGIOKA Ken-ichi
    Department of Mechanical Engineering and Advanced Institute of Fluid Science and Engineering, Kyoto University
  • KOMORI Satoru
    Department of Mechanical Engineering and Advanced Institute of Fluid Science and Engineering, Kyoto University

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  • 一様せん断流中の球形気泡に働く抗力と揚力の評価
  • イチヨウ センダンリュウチュウ ノ キュウケイ キホウ ニ ハタラク コウリョク ト ヨウリョク ノ ヒョウカ

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Abstract

Drag and lift forces acting on a spherical bubble in a homogeneous linear shear flow were numerically investigated by means of a three dimensional direct numerical simulation based on a marker and cell (MAC) method. The effects of fluid shear rate and particle Reynolds number on drag and lift forces acting on a spherical bubble were compared with those on an inviscid bubble. The results show that the drag force acting on a spherical bubble in a linear shear flow increases with shear. The behavior of the lift force on a bubble is quite similar to that on an inviscid bubble, but the effects of fluid shear rate on the lift force acting on a spherical bubble in the linear shear flow become bigger than that acting on an inviscid bubble in the particle Reynolds number region of 1≤Rep≤300.

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