کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7060251 | 1458493 | 2016 | 35 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Direct resolution of differential pressure fluctuations to characterize multi-scale dynamics in a gas fluidized bed
ترجمه فارسی عنوان
وضوح مستقیم از نوسانات دیفرانسیل فشار برای توصیف پویایی چند مقیاس در یک تخت گاز مایع
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کلمات کلیدی
بستر سیال، فشار دیفرانسیل تبدیل موجک، تابع تراکم ساختار، چند مقیاس،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
A direct resolution approach was proposed to decompose differential pressure signals from a gas fluidized bed into macro- and super-imposing components, which were further subjected to structure density function analysis (SDF analysis) to study dynamics of multi-scale structures in flow. Direct resolution performed well in extracting feature information of multi-scale structures, especially macro- and meso-scale structures whose dynamic behaviors majorly affected hydrodynamics in bed, from measured differential pressure fluctuations. With the assistance of Gaussian fitting and Kolmogorov-Smirnov test, SDF analysis divided the probability distribution of multiple structures with respect to their amplitude scale r into four feature regions (Regions B-I, B-II, B-III and Region A). Parameter KSDF derived from slope of Region B-II quantified frequency of various meso-scale structures in flow, and well followed the tendency of flow patterns transition after being normalized by bubble (slug) rising velocity Ub(sl). Frequency of macro-scale structures in slugging flow depended greatly on rising velocity of slugs, so SDFmacro increased with increased fluidization velocity. Developed turbulent flow had a high SDFmacro exceeded 0.8Â Hz due to the fast passage and split/integration of large voids. Structures localized in Region A mainly represented noise from measurements, other measurable micro-scale disturbances in single phases or phase-interfaces, and had an occurring frequency increased with increase of fluidization velocity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Multiphase Flow - Volume 85, October 2016, Pages 380-394
Journal: International Journal of Multiphase Flow - Volume 85, October 2016, Pages 380-394
نویسندگان
Chen Yumin, Chen Wei, John R. Grace, Zhao Yongchun, Zhang Junying, Li Yimin,