شبیه‌سازی به روش شبکة بولتزمن سه بعدی از نوسانات یک قطره آونگان در حال رشد

نوع مقاله : علمی-پژوهشی

نویسندگان

1 دانشگاه آزاد اسلامی واحد آستارا- گروه فنی و مهندسی

2 دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، دانشکده مهندسی مکانیک، تهران، ایران

چکیده

در این مقاله، معادله نیرو-جابجایی و نوسانات سه بعدی غیر خطی یک قطره آونگان به صورت عددی بررسی می‌شود. رشد و جدایش قطره، که به دلیل گرانش از انتهای لولة مویین آویزان است، (با فرض نسبت‌های چگالی و گرانروی بالا و جریانهای دو فازی غیرقابل اختلاط در نظر گرفته می‌شود. از روش شبکة بولتزمن با زمان آرامش سه بعدی برای شبیه‌سازی رشد، جدایش و نوسانات قطره استفاده شد. متوجه شدیم که قطره در حال رشد همزمان سه رفتار کششی مختلف را نشان می‌دهد. نشان داده شد که قطره دارای شتاب نوسانی است. حداکثر دامنه شتاب بدون بعد حدود 35 و فرکانس بدون بعد حدود 40 بود. نتیجه گیری شد که قطره هنگام رشد امواج صوتی را در بالادست تولید می‌کند. اگرچه جریان در جهت گرانش بود، نوسانات عرضی با دامنه کم و با فرکانس بدون بعد 500 تا 800 در طول رشد قطره تشخیص داده شد.

کلیدواژه‌ها

موضوعات


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