کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7706160 | 1497306 | 2018 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Experimental and numerical investigation of turbulent jets issuing through a realistic pipeline geometry: Asymmetry effects for air, helium, and hydrogen
ترجمه فارسی عنوان
بررسی تجربی و عددی جت های آشفته که از طریق یک هندسه خطی واقع گرایانه صدق می کند: اثرات نامتقارن برای هوا، هلیوم و هیدروژن
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کلمات کلیدی
جت های آشفته، سرعت سنجی تصاویر ذرات، فلورسانس ناشی از لیزر فلورسانس، شبیه سازی گردابی بزرگ، زیرساخت هیدروژن، مخلوط آشفته،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
چکیده انگلیسی
Experiments and numerical simulations were conducted to investigate the dispersion of turbulent jets issuing from realistic pipe geometries. The effect of jet densities and Reynolds numbers on vertical buoyant jets were investigated, as they emerged from the side wall of a circular pipe, through a round orifice. Particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) techniques were employed simultaneously to provide time-averaged flow velocity and concentrations fields. Large eddy simulation (LES) was applied to provide further detail with regards to the three-dimensionality of air, helium, and hydrogen jets. These jets were always asymmetric and found to deflect about the vertical axis. The deflection was influenced by buoyancy, where heavier gases deflected more than lighter gases. Significant turbulent mixing was also observed in the near field. The jets from realistic pipe geometries experienced faster velocity decay and asymmetric jet spreading compared to round jets. These findings indicate that conventional round jet assumptions are, to some extent, inadequate to predict gas concentration, entrainment rates and, consequently, the extent of the flammability envelope of realistic gas leaks.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 43, Issue 19, 10 May 2018, Pages 9379-9398
Journal: International Journal of Hydrogen Energy - Volume 43, Issue 19, 10 May 2018, Pages 9379-9398
نویسندگان
Majid Soleimani nia, Brian Maxwell, Peter Oshkai, Nedjib Djilali,