4953

4656

كارشناسي ارشد

تبديل انرژي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1388

شانزده،107ص: مصور،جدول، نمودار

ص.ع. به: فارسي و انگليسي

احمد رضا پيشه ور، محسن ثقفيان

28/10/88

ابراهيم شيراني، محمد رضا سليم پور

مهندسي مكانيك

ID4656

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

Numerical Simulation of Gas Injection into Ladle Furnaces Elaheh Rabiei elaherab@yahoo com 2009 04 20 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiDr A Pishehvar Email apisheh@cc iut ac irDr M Saghafian Email saghafian@cc iut ac irAbstractGas injection is a common practice in metallurgical industries In this process the material ina container is stirred by injecting an inert gas from the bottom In steelmaking ladles gasstirring is used for example to enhance reaction rates and to eliminate thermal orcomposition gradients In general there are two basic formulations for studying flows arisen from the injection of agas phase into a liquid phase the Eulerian Eulerian approach and the Eulerian Lagrangianapproach In the present work the Eulerian Eulerian framework is adopted to simulate themain hydrodynamic features of the bubbly flow generated in a gas stirred ladle On the otherhand in the process of inclusion removal it is vital to have an accurate estimation of thedispersed phase For this reason a one way Lagrangian particle tracking method is used tostudy the behavior of dispersed particles Velocity and trajectory of particles are obtained bytracking some individual particles through the flow field The aim of this study is to develop a three dimensional mathematical model for predictingthe transient behavior of flow field in the steelmaking ladle during a refining gas stirringprocess In this work the effects of the position of nuzzle and the number of nuzzle on thequality of the developed flow field for two distinct geometrical models is studied Twomodels are compared in terms of flow pattern the strength of circulation dead zones and theability to distribute the additive particles The results show that for a given gas flow rate theLF with only one injection nozzle is more efficient than the other model with two nozzles Also we performed a wide investigation on the role of inter phase forces Comparison ofresults indicates that although considering non drag forces can lead to a more accuratesimulation in case of injecting a high volume fraction of small size bubbles they have only alittle effect on the results Key WordsMultiphase Ladle Furnace Gas injection Eulerian Eulerian Eulerian Lagrangian Ansys CFX Particle Tracking

احمد رضا پيشه ور، محسن ثقفيان

ابراهيم شيراني، محمد رضا سليم پور