کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8254294 1533620 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Multiscaling properties on sequences of turbulent plumes images
ترجمه فارسی عنوان
خواص چندگانه در دنباله ای از تصاویر پر از آشفتگی
کلمات کلیدی
روش مولتی فرکتال، طیف مولتی فرکتال، پرتقال آشفته، ضریب جذب، تقارن طیف،
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک آماری و غیرخطی
چکیده انگلیسی
A multifractal analysis on a finite-range-scale of the plume concentration images at different experimental conditions (the height of the source Ho), where the measure is the grey value of the image (from 0 to 255), was applied to study its structure through time. The multifractal spectrum showed the characteristic inverse U-shape and a similar evolution in all Ho. The variation of the Hölder exponent (Δα) presented different amplitudes at different moments and increased with time. The symmetry of the spectrum (Δf) decreased with time achieving negative values (from left hand asymmetry evolving to right asymmetry). We show the different behaviour of axial velocity (W) with Δα and Δf. There is a linear relation of entrainment coefficient (αe) and the entropy dimension (α1). Therefore, the multifractal spectrum and the derived parameters can be used as markers of plume evolution as well as to study the effect of experimental conditions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chaos, Solitons & Fractals - Volume 105, December 2017, Pages 128-136
نویسندگان
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