کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6589465 | 456849 | 2015 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
New methods for flow regime identification in bubble columns and fluidized beds
ترجمه فارسی عنوان
روش های جدید برای شناسایی رژیم جریان در ستون های حباب و تخت های سیال
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کلمات کلیدی
شناسایی رکورد جریان، ستون حباب، بستر سیال، سرعت گذار، آنتروپی، آنتروپی اطلاعات،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
New methods for flow regime identification were developed and applied to photon count time series measured in a bubble column (0.162Â m in ID) and fluidized bed (0.438Â m in ID). The signals in the bubble column (operated with an air-therminol system) were measured by means of Computed Tomography (CT), whereas the data in the fluidized bed (operated with an air-polyethylene system) were recorded by means of Nuclear Gauge Densitometry (NGD). The hidden information in the time series was extracted by means of two new parameters: entropy (bit/s) and information entropy (bit). Both of them were calculated on the basis of multiple reconstructions of the time series. In the case of the bubble column, the well-pronounced local minima were used for identification of three transition velocities (0.04, 0.08 and 0.13Â m/s). They distinguished the boundaries of the bubbly flow, transition and churn-turbulent flow regimes. In the case of the fluidized bed, the minimum fluidization velocity (0.086Â m/s) and minimum bubbling velocity (0.12Â m/s) were also identified on the basis of the well-pronounced local minima in the profiles of the new parameters. They distinguished the boundaries of both the transition and bubbling fluidization regimes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 137, 1 December 2015, Pages 436-446
Journal: Chemical Engineering Science - Volume 137, 1 December 2015, Pages 436-446
نویسندگان
Stoyan Nedeltchev,