کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
659333 1458131 2009 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reynolds number effects within the development region of a turbulent round free jet
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Reynolds number effects within the development region of a turbulent round free jet
چکیده انگلیسی
In this work, flying and stationary hot-wire measurements were made to investigate the effect of the Reynolds number on the near- and intermediate-fields region (0 ⩽ x/D ⩽ 25) of a round free jet. Measurements were carried out over a range of Reynolds numbers, based on the jet exit mean velocity and the nozzle diameter, that span the mixing transition. The specific Reynolds numbers tested were 6000, 10,000 and 30,000. The objective of this study was to determine what differences there were in mean velocity profiles, turbulence intensity profiles, and velocity spectra. Results revealed a close coupling between the mean velocity distribution and the turbulence intensities and the Reynolds shear stress. From those data obtained, it was concluded that the inertial sub-range frequency span increases with distance downstream from the jet inlet and the mixing transition seems to occur at the appearance of the inertial sub-range rather than at the transition from the inertial to dissipation range.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 52, Issues 17–18, August 2009, Pages 3943-3954
نویسندگان
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