پديد آورنده :
وكيلي، محمدحسن
عنوان :
پيشگويي توزيع اندازه ذرات در پليريزاسيون سوسپانسيوني وينيل كلرايد
گرايش تحصيلي :
مهندسي شيمي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان: دانشكده مهندسي شيمي
صفحه شمار :
يازده، 160 ، [II] ، ص: مصور، جدول، نمودار
يادداشت :
ص. ع. به: فارسي و انگليسي
استاد راهنما :
محسن نصر اصفهاني
استاد مشاور :
شاپور رود پيما
توصيفگر ها :
ديناميك سيالات محاسباتي , مخزن همزندار , مدل موازنه جمعيتي
تاريخ نمايه سازي :
88/4/23
استاد داور :
ارجمند مهرباني، محمد رضا طلايي، محمود اشرفي زاده
تاريخ ورود اطلاعات :
1396/12/08
كد ايرانداك :
ID248 دكتري
چكيده فارسي :
به فارسي وانگليسي: قابل رويت در نسخه ديجيتال
چكيده انگليسي :
Prediction of particle size distribution in vinyl chloride suspension polymerization Mohammad Hassan Vakili P8130292@ce iut ac ir 29 April 2009 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Mohsen Nasr Esfahany mnasr@cc iut ac ir Shapoor Roodpeyma shapoor@cc iut ac ir Isfahan University of Technology Dept of Chemical Engineering Isfahan University of Technology Dept of Chemical EngineeringAbstractA three compartment model was used to study turbulent flow field in a baffled stirred tank Threedifferent zones of the vessel that were impeller zone baffle zone and circulation zone wereinvestigated Boundaries of these zones were determined using a new method namely gradientmethod and a traditional cumulative energy dissipation method Zone boundaries determined byboth methods were comparable Effect of some parameters on turbulent flow field was alsostudied Both turbulent kinetic energy TKE and TKE dissipation rate showed a considerablevariation with agitation rate in all three zones and with impeller diameter only in impeller zone Three compartment model was also used to predict Particle size distribution PSD of poly vinylchloride in an industrial suspension polymerization reactor using Population balance model CFD simulations were performed to obtain turbulence parameters for solving population balancemodel Adjustable parameters of population balance model were calculated using experimentalPSD data for grade65 The population balance was also used to predict PSD of grade70 that wasin good agreement with experimental data Sauter mean diameter of the produced PVC powderincreased with dispersed phase volume fraction and decreased with suspending agentconcentration It was also found that sauter mean diameter variation with agitation rate passed aminimum Keyword three compartment model suspension polymerization population balance poly vinylchloride CFDIntroductionStirred vessels are widely used in chemical process industries to perform a variety of operationssuch as homogenization gas dispersion polymerization heat transfer etc Study of turbulentflow and computation of its properties in a stirred vessel is a considerable challenge for existingturbulence models Analyzing the turbulent flow pattern and its properties in stirred vessels maybe a beneficial tool for equipment design process scale up energy conservation and productquality control The study of turbulent flow field and its properties in stirred tanks has been subject of numeroustheoretical and numerical investigations 1 5 Suspension polymerization is a two phase process usually carried out in a baffled stirred tankreactor One of the most important tasks in suspension polymerization is achievement ofdesirable particle size distribution PSD of final product Numerical prediction of particle sizedistribution PSD in suspension polymerization was performed by many researchers 6 7 Population balance model can be used for prediction of particle size distribution Two basic 1
استاد راهنما :
محسن نصر اصفهاني
استاد مشاور :
شاپور رود پيما
استاد داور :
ارجمند مهرباني، محمد رضا طلايي، محمود اشرفي زاده
