کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
159766 457046 2005 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Slumping–rolling transition of granular solids in rotary kilns
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Slumping–rolling transition of granular solids in rotary kilns
چکیده انگلیسی

Recent research work on the slumping–rolling transition of granular solids in rotary kilns is reviewed. A mathematical model is presented for the calculation of critical Froude number. It is supposed that the transition occurs when the time needed by the propagating avalanche to leave the shear wedge becomes comparable to the time of the shear wedge to be refilled with new particles transported by the rotating wall. It is found that the critical Froude number is proportional to the size ratio d/Dd/D (particle to cylinder diameter) and inversely proportional to sin2ε, where εε is the fill angle of the solid bed. Besides the particle diameter, the influence of the bed material needs to be described by only one measurable parameter—the upper angle of repose. To validate the model, the transition behaviour of different bed materials was measured in cylinders of three different sizes. The model is found to predict our measurements as well as those reported in the literature. It is also compared with models from other authors.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 60, Issue 13, July 2005, Pages 3629–3636
نویسندگان
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