کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
622448 882646 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Measuring Flow Velocity in Pulp Suspension Mixing Using Ultrasonic Doppler Velocimetry
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Measuring Flow Velocity in Pulp Suspension Mixing Using Ultrasonic Doppler Velocimetry
چکیده انگلیسی

Ultrasonic Doppler velocimetry (UDV), a non-invasive fluid flow measurement technique suitable for use in opaque systems, was used to measure pulp suspension flow velocity in a rectangular 1 : 11-scale agitated pulp stock chest. The flow characteristics of a Maxflo impeller were measured as a function of fibre mass concentration, fibre type and impeller speed. Using the velocity profiles measured, the impeller pumping rate and flow number were calculated as a function of suspension yield stress (itself a function of fibre mass concentration and fibre type). The flow number was found to decrease as the suspension yield strength increased. For example, when the mass concentration of a hardwood pulp was increased from 0% (water) to 3.3%, the flow number decreased from 0.64 to 0.43. UDV was also used to identify regions of poor mixing by measuring flow profiles at critical locations within the vessel. This study also demonstrates the ability of UDV to measure the cavern size of the pulp suspension during agitation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Research and Design - Volume 85, Issue 5, 2007, Pages 591–597
نویسندگان
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