توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱CFD Modeling of Polyethylene Fluidized Bed Reactor
نویسنده(ها): ،
اطلاعات انتشار: نخستین همایش مهندسی فرآیند در صنایع نفت، گاز، پتروشیمی و انرژی، سال
تعداد صفحات: ۱۰
Poly propylene (PP) is one of the famous polymers with great application. In this study, CFD model on dynamics of the fluidized bed polyethylene production process has been investigated. A detailed CFD model for sticky poly propylene fluidized bed was formulated in this work. As a result, detailed information on the PSD and hydrodynamic fields of the gas and solid phases can be obtained from the simulations. Defluidization due to particle aggregation also can be simulated. For modeling plant–scale poly propylene reactors, a chemical look–up table should be used to solve efficiently the solid species equations.. In order to address all the issues in FB polymerization, models for simplified polymerization kinetics, polydisperse multiphase flow, and mass and heat transfer between the gas and solid particles are combined together. As a result, physically aggregation because of atactic polypropylene is more important than other aggregation reasons. Finally, as mentioned earlier, after DQMOM is applied to the multi–fluid CFD model, new terms accounting for the effect of aggregation and breakage need to be added on the right–hand sides of the solid–phase momentum, energy, and species equations. These modifications and detailed simulation results for plant–scale fluidized bed polymerization reactors will be reported in future communications<\div>

۲Modeling of Colloid Adsorption by Using of Adsorbent Particles
اطلاعات انتشار: اولین همایش ملی فناوری های نوین در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۹
Sedimentation of adsorbent particles was investigated for obtaining the sedimentation properties of the adsorbent. The suspension was modeled assuming three regions including clear liquid, variablecomposition and sediment zone exist in the column. A semi–empirical correlation was derived foradsorbent particles concentration distribution as a function of time and overall suspension depth. Mass transfer into adsorbent was modeled using proposed concentration distribution function of adsorbents. Colloid concentration distribution in suspended liquid was calculated with time and liquid depth numerically. An effect of sedimentation properties on adsorption efficiency was investigated<\div>

۳Predicting Macro Scale Parameters of Porous Media by Micro Scale CFD Modeling of Fluid Flow
نویسنده(ها): ،
اطلاعات انتشار: اولین همایش ملی فناوری های نوین در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۹
The structure of porous media in format of electron microscopy image was used and geometry of fluid flow in a sample porous media was created. The flowpatterns are described and the pressure and the shear stress at the fluid\solid surfaces are analyzed in the porous media by means of Computational Fluid Dynamic. Threelaminar flow regimes; Darcy, transition and strong inertia were shown. As a consequence, the Non–Darcy 2D–flow is correctly modelled by Forchheimer’sequation. Capillary pressure hysterics in drainage and imbibitions of wetting phase to porous media because of pore structure has been shown. Residual saturation of nonwetting and wetting phases in drainage and imbibitions has been illustrated, too.Finally, connection between imaging results and informative data bank from numerical modelling was shown<\div>

۴Theoretical and experimental study of sedimentation of colloidal particles by using of adsorbents
اطلاعات انتشار: سومین همایش ملی کاربردهای شیمی در فناوریهای نوین، سال
تعداد صفحات: ۹
Sedimentation of adsorbent particles was investigated for obtaining the sedimentation properties of the adsorbent. The suspension was modeled assuming three regions including clear liquid, variable composition and sediment zone exist in the column. A semi–empirical correlation was derived for adsorbent particles concentration distribution as a function of time and overall suspension depth. Mass transfer into adsorbent was modeled using proposed concentration distribution function of adsorbents. Colloid concentration distribution in suspended liquid was calculated with time and liquid depth numerically. An effect of sedimentation properties on adsorption efficiency was investigated.<\div>
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