Unsteady RANS and detached eddy simulation of the multiphase flow in a co-current spray drying  

平行喷雾干燥中多相流动的非稳RANS及脱涡模拟(英文)

作　　者：Jolius Gimbun Noor Intan Shafinas Muhammad Woon Phui Law 

机构地区：[1]Centre of Excellence for Advanced Research in Fluid Flow, Universiti Malaysia Pahang [2]Faculty of Chemical and Natural Resources Engineering, Universiti Malaysia Pahang [3]Faculty of Technology, Universiti Malaysia Pahang

出　　处：《Chinese Journal of Chemical Engineering》2015年第9期1421-1428,共8页中国化学工程学报（英文版）

基　　金：Supported by the Ministry of Education Malaysia through RACE(RDU121308)and FRGS(RDU130136)

摘　　要：A detached eddy simulation(DES) and a k-ε-based Reynolds-averaged Navier–Stokes(RANS) calculation on the co-current spray drying chamber is presented. The DES used here is based on the Spalart–Allmaras(SA) turbulence model, whereas the standard k-ε(SKE) was considered here for comparison purposes. Predictions of the mean axial velocity, temperature and humidity profile have been evaluated and compared with experimental measurements. The effects of the turbulence model on the predictions of the mean axial velocity, temperature and the humidity profile are most noticeable in the(highly anisotropic) spraying region. The findings suggest that DES provide a more accurate prediction(with error less than 5%) of the flow field in a spray drying chamber compared with RANS-based k-ε models. The DES simulation also confirmed the presence of anisotropic turbulent flow in the spray dryer from the analysis of the velocity component fluctuations and turbulent structure as illustrated by the Q-criterion.A detached eddy simulation（DES） and a k-ε-based Reynolds-averaged Navier–Stokes（RANS） calculation on the co-current spray drying chamber is presented. The DES used here is based on the Spalart–Allmaras（SA） turbulence model, whereas the standard k-ε（SKE） was considered here for comparison purposes. Predictions of the mean axial velocity, temperature and humidity profile have been evaluated and compared with experimental measurements. The effects of the turbulence model on the predictions of the mean axial velocity, temperature and the humidity profile are most noticeable in the（highly anisotropic） spraying region. The findings suggest that DES provide a more accurate prediction（with error less than 5%） of the flow field in a spray drying chamber compared with RANS-based k-ε models. The DES simulation also confirmed the presence of anisotropic turbulent flow in the spray dryer from the analysis of the velocity component fluctuations and turbulent structure as illustrated by the Q-criterion.

关 键 词：Drying Turbulence Two-phase flow CFD Detached eddy simulation Modelling strategy 

分 类 号：TQ028.6[化学工程]