بررسی عددی جریان القا شده توسط یک شیر دروازه‌ای در رژیم جریان اسلاگ

نوع مقاله : مقاله مکانیک

نویسندگان

دانشکده مهندسی مکانیک و انرژی، دانشگاه شهید بهشتی، تهران، ایران

چکیده

در بیشتر کاربردهای صنعتی به دلیل خاصیت نامنظمی و نوسانات فشار بالا در رژیم جریان اسلاگ، سعی بر آن است که از تشکیل آن جلوگیری شود. هدف از این تحقیق، بررسی گرادیان فشار، کسر حجمی مایع اسلاگ، فرکانس اسلاگ و طول اسلاگ با استفاده از شبیه‌سازی عددی برای جریان اسلاگ با وجود شیر دروازه‌ای در لوله افقی می‌باشد. برای دستیابی به این هدف، شبیه‌سازی عددی برای رژیم جریان اسلاگ در یک لوله افقی به طول 10 متر و قطر 20 میلی‌متر با سه نسبت بازشدگی سطح مقطع مجزا انجام شد. ابتدا نتایج عددی (فرکانس اسلاگ) در مقایسه با سایر مطالعات عددی اعتبارسنجی شد و توافق منطقی با خطای کمتر از 3 درصد به‌دست آمد. دوم، نتایج عددی در مقایسه با داده‌های تجربی از نظر زمان و مکان برای حالتی که جریان اسلاگ در مواجهه با شیر دروازه‌ای قرار دارد، تأیید شد و خطای کمتر از 15٪ به‌دست آمد. در نهایت، گرادیان فشار، فرکانس اسلاگ، طول اسلاگ و کسر حجمی مایع با وجود شیر دروازه‌ای با استفاده از روش عددی مورد بررسی قرار گرفت. نتایج بیانگر این بود که فرکانس اسلاگ به میزان 3/4 درصد افزایش می‌یابد و این پدیده به دلیل موج‌های کوچکی است که به دلیل افت فشار زیاد در محل شیر به وجود می‌آیند. طول اسلاگ مایع با کاهش بازشدگی دهانه شیر دروازه‌ای به میزان 89/20 افزایش و با افزایش سرعت سطحی گاز به میزان 4/30 درصد کاهش می‌یابد. با افزایش فاصله از شیر دروازه‌ای افت فشار به میزان 65/15 درصد کاهش می‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical Investigation of Flow Induced by a Gate Valve in the Slug Regime

نویسندگان [English]

  • Samira Mohammadi
  • Ali Jahangiri
  • Mohammad Emamzadeh
  • Sahand Majidi
Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran
چکیده [English]

Slug flow is a part of an intermittent flow that is avoided in industrial applications because of its irregularity and high-pressure fluctuations. The present investigation aims to comprehend the behavior of intermittent slug flow with the gate valve and its associated pressure drop, slug liquid holdup, slug frequency, and averaged slug body length using CFD simulation studies. To achieve this objective, numerical investigations of slug flow were carried out on a horizontal pipe 10 m in length and 20 mm in diameter with three distinct area contraction ratios. First, the numerical results (slug frequency) were validated by comparison with other studies, and a reasonable agreement with an error of less than 3% was achieved. Second, the numerical results were validated by comparison with experimental data in terms of time and space for slug flow encountering the gate valve, and a sensible agreement with an error of less than 15% was achieved. Eventually, pressure gradient, slug frequency, slug length, and the existence of a gate valve have been investigated using numerical methods. The results showed that the slug frequency increases by 4.3% and this phenomenon is due to the small waves that occur due to the high pressure drop at the valve location. The length of the liquid slug increases by 20.89 percent by reducing the opening of the gate valve and decreases by 30.4 percent by increasing the surface velocity of the gas. By increasing the distance from the gate valve, the pressure drops decrease by 15.65%.

کلیدواژه‌ها [English]

  • Numerical simulation
  • Slug frequency
  • Pressure drop
  • Horizontal pipe
  • Gate valve
  • Two-Phase flow

مراجع

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مدل سازی در مهندسی
دوره 23، شماره 80
در حال تکمیل شدن
فروردین 1404
صفحه 219-232

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سابقه مقاله

  • تاریخ دریافت: 27 بهمن 1402
  • تاریخ بازنگری: 18 خرداد 1403
  • تاریخ پذیرش: 23 خرداد 1403

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