Publication detail
Numerical study of stirred tank with multiphase system
VONDÁL, J. HÁJEK, J. DOHNAL, M.
Czech title
Numerické modelování vícefázového systému v míchaném reaktoru
English title
Numerical study of stirred tank with multiphase system
Type
conference paper
Language
en
Original abstract
The present work aims to develop a modelling approach for the simulation of multiphase stirred tank with floating particles, suitable for up-scaling studies. Multiphase numerical modeling is used for predicting velocity profiles in stirred liquid. Free surface is evaluated from gas-liquid phase interaction. Transient time is incorporated in simulation. Entire simulation is run in this mode. It includes impeller start-up phase from zero to the full speed. The methodology is demonstrated on a case of published stirred tank design previously analyzed by experimental methods. Scale-up of stirred tanks is a frequently faced problem, which is difficult in cases of multiphase systems, especially with floating particles. The methodology presented in this work is directly applicable in practical problems concerning the scale-up of such complex multiphase systems. Free surface effect on velocity profile and on drawn-down location of solids is presented. This is usually omitted and simplified as a flat surface.
Czech abstract
Cílem práce je navrhnout a ověřit postup pro modelování vícefázového systému v míchaném reaktoru s plovoucími částicemi s důrazem na možnost přechodu z laboratorní veliosti na průmyslovou velikost. Počítačové modelování je použito pro predikci rychlostí v míchané kapalině. Predikována je také volná hladina jako rozhraní mezi kapalnou a plynnou fází. Identifikována jsou místa u hladiny, kde dochází ke strhávání pevných částic proudem kapaliny pod hladinu.
English abstract
The present work aims to develop a modelling approach for the simulation of multiphase stirred tank with floating particles, suitable for up-scaling studies. Multiphase numerical modeling is used for predicting velocity profiles in stirred liquid. Free surface is evaluated from gas-liquid phase interaction. Transient time is incorporated in simulation. Entire simulation is run in this mode. It includes impeller start-up phase from zero to the full speed. The methodology is demonstrated on a case of published stirred tank design previously analyzed by experimental methods. Scale-up of stirred tanks is a frequently faced problem, which is difficult in cases of multiphase systems, especially with floating particles. The methodology presented in this work is directly applicable in practical problems concerning the scale-up of such complex multiphase systems. Free surface effect on velocity profile and on drawn-down location of solids is presented. This is usually omitted and simplified as a flat surface.
Keywords in English
CFD; stirred tank; multiphase; simulation; mixing
RIV year
2015
Released
01.10.2015
Publisher
Aidic Servizi Srl
Location
Milano, Italy
ISBN
978-88-95608-36-5
ISSN
2283-9216
Book
Proceedings of the 18th International Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES 2015)
Volume
45
Pages from–to
1051–1056
Pages count
6
BIBTEX
@inproceedings{BUT117250,
author="Jiří {Vondál} and Jiří {Hájek} and Miloslav {Dohnal},
title="Numerical study of stirred tank with multiphase system",
booktitle="Proceedings of the 18th International Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES 2015)",
year="2015",
volume="45",
month="October",
pages="1051--1056",
publisher="Aidic Servizi Srl",
address="Milano, Italy",
isbn="978-88-95608-36-5",
issn="2283-9216"
}