کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1721865 1014700 2016 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The experiment and analysis of transitional flow in pipe
ترجمه فارسی عنوان
آزمایش و تجزیه و تحلیل جریان انتقالی در لوله
کلمات کلیدی
جریان انتقالی؛ میرایی؛ گرادیان سرعت؛ جریان بی ثباتی؛ ضریب انرژی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی دریا (اقیانوس)
چکیده انگلیسی

The transitional flow in a pipe is important for delivery, but its characteristics remain to be explored. In this paper, the two-dimensional laser Doppler velocimetry (LDV) is used for the study, focusing on the attenuation characteristics of the axial velocity, the variation of the velocity gradient, the effect of the angle between the axis and the resultant velocity vector, and the relationship between the energy coefficient and the flow state. The attenuation characteristics of the axial velocity along the radial direction are obtained. It is shown that with the increase of the Reynolds number, the change rate of the velocity gradient slows down with a similar distribution, and a rapid decrease is seen in the near wall region. The amplitude and the frequency of the angular variation are obviously improved with the increase of the Reynolds number. The instability of the velocity field is enhanced with the increase of the energy coefficient.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hydrodynamics, Ser. B - Volume 28, Issue 2, April 2016, Pages 313–318
نویسندگان
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