کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
158705 457016 2006 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Square-well model for cohesion in fluidized beds
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Square-well model for cohesion in fluidized beds
چکیده انگلیسی

Cohesive forces are implemented into a discrete-particle, fluidized-bed simulation using a square-well potential. The square-well description treats cohesive interactions as instantaneous, binary events, thereby making it a viable option for the incorporation of cohesion into a kinetic-theory-based continuum model. Cohesive forces are also incorporated into the simulation using the more elaborate Hamaker description of van der Waals forces in order to provide a basis for assessing the square-well model. Both cohesion models are implemented in the discrete-particle framework of the MFIX software package. A mapping method is also developed to convert material-specific Hamaker constants into equivalent square-well parameters. The corresponding results from the two models are compared both qualitatively and quantitatively. The predictions of the square-well model are on par with the Hamaker model with respect to mixing level, particle mobility and minimum fluidization velocity. Subtle differences are observed between the two models in cases that involved such high levels of cohesion that the particle bed could not fully fluidize.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 61, Issue 14, July 2006, Pages 4511–4527
نویسندگان
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