کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6464693 1362211 2016 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Assessment of the effective viscous dissipation for deagglomeration processes induced by a high shear impeller in a stirred tank
ترجمه فارسی عنوان
ارزیابی از رسوب گذاری موثر چسبندگی برای فرآیندهای تخریب پذیری ناشی از یک پروانه برشی بالا در یک مخزن مخلوط
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


- A Hockmeyer®-type impeller is evaluated for dispersing particle agglomerates.
- The viscous dissipation is a key parameter for fine powder deagglomeration.
- The influence of the power input on the powder dispersion efficiency is investigated.
- Maximum effective viscous dissipation is located in the impeller blades swept volume.

A ring-style high shear impeller Hockmeyer® type (HockD-2R) of practical importance (Hockmeyer® Equipment Corp. D-Blade), commonly used in the paint and coatings industry to rapidly break lumps of powdery material in a liquid was investigated, and its performance compared against the classical Rushton turbine (RT). A numerical and experimental study in an unbaffled tank, operating in the laminar to transitional flow regime (50 ⩽ Re ⩽ 125) was carried out. Simulations were conducted using commercial Computational Fluid Dynamics (CFD) solver ANSYS Fluent 14.5. Local hydrodynamics (velocity vectors and viscous dissipation), averaged viscous dissipation values and pumping capacities, obtained from simulations, were firstly used to compare the impeller's performance. After that, experiments were performed to investigate the influence of the viscous dissipation on the amount of fines generation from mineral powders. It was found that the volume swept by the blades is the region of maximum effective viscous dissipation, considering its effects on breakage of particle agglomerates. Further experiments were conducted to investigate the influence of the power input on the powder dispersion efficiency. At the same power draw and higher speeds, the HockD-2R was found to be more efficient than the RT for fine aggregates production.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advanced Powder Technology - Volume 27, Issue 5, September 2016, Pages 1885-1897
نویسندگان
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