Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
권호 표지

Prediction of Hindered Settling Velocity of Bidisperse Suspensions

이중 입도 분포를 가진 현탁액의 침강 속도 예측

  • Koo, Sangkyun (Department of Industrial Chemistry, Sangmyung University)
  • 구상균 (상명대학교 공업화학과)
  • Received : 2008.07.14
  • Accepted : 2008.10.28
  • Published : 2008.12.10

Abstract

The present study is concerned with a simple numerical method for estimating the hindered settling velocity of noncolloidal suspensions with bidisperse size distribution of particles. The method is based on an effective-medium theory which uses the conditional ensemble averages for describing the velocity fields or other physical quantities of interest in the suspension system with the particles randomly placed. The effective-medium theory originally developed by Acrivos and Chang[1] for monodisperse suspensions is modified for the bidisperse case. Using the radial distribution functions and stream functions the hindered settling velocity of the suspended particles is calculated numerically. The predictions by the present method are compared with the previous experimental results by Davis and Birdsell[2] and Cheung et al.[3]. It is shown that the estimations by the effective-medium model of the present study reasonably agree with the experimental results.

Keywords

effective-medium model;hindered settling velocity;bidisperse suspensions;radial distribution function;conditional ensemble average

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