کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
620573 882491 2014 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mixing of viscous Newtonian fluids in a vessel equipped with steady and unsteady rotating dual-turbine impellers
ترجمه فارسی عنوان
مخلوط کردن مایعات نیوتنی ویسکوز در یک رگ مجهز به توربین دوگانه توربین دوار با دوام ثابت و غیرمتعارف
کلمات کلیدی
مخلوط کردن، جداسازی، آشوب، هیدرودینامیک، تصویربرداری
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
چکیده انگلیسی


• Toroidal IMR structure in vicinity of the impeller in case of unidirectional mixing.
• Spiral-shape IMR structure for unsteady forward–reverse mixing.
• The forward–reverse mixing is much more efficient than standard mixing.
• Power requirements of forward–reverse and unidirectional mixing are comparable.

This paper presents investigation on the possibility to improve the efficiency of mixing of the highly viscous Newtonian fluids in a vessel with utilization of unsteady rotating dual turbine impellers. Flow visualization experiments were used to examine the size, positions and structure of the IMR (Isolated Mixing Regions) regions as a function of Reynolds number as well as mixing time. Additionally, the effect of frequency of impellers’ oscillation on mixing efficiency was examined. It was found that the use of unsteady forward–reverse mixing mode enhance the mixing efficiency in comparison to standard mixing (up to about eight times). The structure of IMR in the forward–reverse mixing is much more complicated than in standard mixing, because of liquid division into spiral-shape filaments. This had caused that dimensionless mixing time was up to about eight times shorter in comparison to standard mode.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Research and Design - Volume 92, Issue 3, March 2014, Pages 435–446
نویسندگان
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