图书馆订阅: Guest
TSFP DL Home 旧刊 执委

LES OF A TWO-PHASE TURBULENT STIRRED REACTOR

Zhilei Wu
Div. of Fluid Mechanics, Lund Institute of Technology SE-221 00 Lund, Sweden

Johan Revstedt
Division of Fluid Mechanics, Lund Institute of Technology P.O. Box 118, S-221 00 Lund, Sweden

Laszlo Fuchs
Department of Mechanics, KTH, CICERO, SE-10044 Stockholm; Division of Fluid Mechanics Lund University Lund, 22363, Sweden

Abstract

LES of a baffled stirred reactor in the presence of bubbles is performed. A multi-grid finite difference code using staggered Cartesian grid is used. The rotating impeller blades are modelled by adding source terms to the Navier-Stokes equations. Euler-Lagrangian approach is used to simulate the two-phase flow, i.e. bubbles are tracked in the turbulent flow field. The effect of bubbles on the properties of the continuous phase are investigated. Two-way coupling simulations with a gas volume fraction of 0.5% are performed and compared to simulations of single phase liquid flow. The results show that the presence of bubbles decrease the averaged radial and azimuthal liquid velocity at the blade tip. This result is in agreement with published experimental data. Also, when the two-way coupling effect is taken into account, the trailing vortices of the blade are decreased in strength.