کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
620866 1455162 2016 18 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical study of active mixing over a dynamic flow field in a T-jets mixer—Induction of resonance
ترجمه فارسی عنوان
مطالعه عددی اختلاط فعال روی یک فیلد جریان پویا در میکسر _ القا T جت رزونانس
کلمات کلیدی
مخلوط کردن؛ جریان آرام؛ مخالف جت میکسر؛ اختلاط فعال؛ تشدید
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
چکیده انگلیسی


• Mixing dynamics in opposed jets mixers is related with flow dynamics.
• Effect of active mixing parameters on flow dynamics is assessed.
• Active mixing is studied regarding phase displacement, amplitude and frequency.
• Mixing is assessed from both energy dissipation and passive tracer simulation.

The flow field in a 2D T-jets mixer was simulated to study the effect of the pulsation/modulation of the jets flow rate on the dynamics of mixing. Different strategies, frequencies and amplitudes of the opposed jets flow rate modulation were tested. The modulation frequencies were set as multiples of the natural oscillation frequencies of the dynamics flow field. The natural flow frequencies are determined from the unforced flow, i.e., when the jets are not modulated. It is found that out phase modulation of the opposed jets, with frequencies close to the natural frequencies, cause resonance of the flow enhancing the order of the system, which results in a flow field with a well-defined repetitive generation of vortices. Conversely, when the pulsation frequencies were different from the natural frequencies the flow disorder was enhanced, i.e., the vortices evolution throughout the T-jets mixers is less repetitive. The impact of the jets flow rate modulation on the flow field dynamics increases with the modulation amplitude up to the extreme case where it completely drives the dynamics of the system. A design equation for the most energy efficient pulsation of the jets feed streams in opposed jets mixers is proposed.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Research and Design - Volume 106, February 2016, Pages 74–91
نویسندگان
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