مطالعۀ تجربی فرآیند شکل‌گیری رژیم شکست کیسه‌ای جت مایع تزریق‌شده در جریان هوا

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مهندسی هوافضا، دانشگاه صنعتی امیرکبیر، تهران.

2 مهندسی هوافضا، دانشگاه صنعتی امیرکبیر، تهران

چکیده

مطالعۀ تجربی به‌منظور بررسی فرآیند شکل‌گیری رژیم شکست کیسه‌ای جت مایع تزریق‌شده به درون جریان هوا انجام شد. جت مایع توسط یک نازل دایروی به قطر 2.83 میلی‌متر در جریان هوا تزریق شده است. از روش سایه‌‌نگاری جهت آشکارسازی جت مایع استفاده شده و همچنین از یک دوربین سرعت‌بالا جهت ضبط و ثبت فرآیند شکل‌گیری و شکست کیسه‌های تشکیل‌شده بر روی ستون جت مایع، بهره گرفته شده است. عدد وبر هوا بین 0.1 تا 40 و نسبت ممنتوم جت مایع به هوا بین 5 تا 30 تغییر داده شده است. در این مطالعه یک تحلیل تئوری با در نظر گرفتن وجود تعادل بین نیروهای وارده بر روی یک کیسه انجام شده است که درنهایت یک عدد معیار برای شکل‌گیری کیسه‌ها به دست آمده است. قطر حلقه و اندازۀ پوسته یا غشاء کیسه‌ها نیز در این مطالعه مورد بررسی قرار گرفته است. نتایج به دست آمده نشان می‌دهد که نسبت بی‌بعد قطر حلقه و اندازۀ پوستۀ کیسه‌ها عددی ثابت بوده و با تغییر عدد وبر هوا و نسبت ممنتوم تغییر نمی‌کند. همچنین نتایج حاکی از آن است که پوستۀ کیسه‌ها نسبت قطر حلقۀ خود رشد بیشتری به سمت جریان هوا می‌کنند

کلیدواژه‌ها


عنوان مقاله [English]

Experiments on the Formation Process of Bag Breakup Regime of Injected Liquid Jet into an Airstream

نویسندگان [English]

  • Yosef Rezaei 1
  • Mehran Tadjfar 2
1 Amirkabir University of Technology.
2 Amirkabir University of Technology.
چکیده [English]

An experiment was conducted to investigate the bag breakup process of round liquid jet injected into an airstream. The liquid jet was visualized using shadowgraph technique and also a high-speed camera was used to observe the formation and breakup of bags in a water jet injected from a 2.83 mm diameter nozzle with air Weber number in the range of 0.1 to 40 and the liquid-to-air momentum ratio from 5 to 30. An analysis of the force balance on bags was conducted and a criterion for bag formation is obtained. In this study, the diameter of the bag ring and the size of the membrane of the bag are calculated. Present results indicate that the normalized ring diameter and the membrane size are constant. Results also show that the membrane of a bag grows more than its ring towards the airstream direction.

کلیدواژه‌ها [English]

  • Bag Breakup Regime
  • Liquid Jet Injection
  • Airstream
  • Multiphase flow
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