تبخیر گذرای قطره دوجزئی در دما و فشار زیاد

مرادی, مهنا; قاسمی, حجت

تبخیر گذرای قطره دوجزئی در دما و فشار زیاد

نوع مقاله: مقاله پژوهشی

نویسندگان

¹ گروه هوافضا، دانشکده مکانیک، دانشگاه علم و صنعت ایران، تهران، ایران،

² دانشگاه علم و صنعت ایران-دانشکده مهندسی مکانیک

چکیده

در این مقاله، تبخیر گذرای قطره دوجزئی در دما و فشار زیاد به صورت عددی مدل‌سازی شده ‌است. در فاز گاز، معادلات بقای جزء، تکانه و انرژی و در فاز مایع، معادلات بقای جزء و انرژی، با رویکرد حجم محدود حل شده‌اند. تغییرات خواص ترموفیزیکی برحسب دما و فشار درنظر گرفته شده است. همچنین فرض تعادل فوگاسیتی در سطح مشترک و معادله حالت پنگ-رابینسون لحاظ شده است. قطره کروی فرض شده و از انحلال‌پذیری گاز در مایع و اثرات شتاب گرانش صرف‌نظر شده ‌است. نتایج مدل برای قطره دوجزئی هپتان-هگزادکان درگستره‌های دمایی و فشاری گسترده اعتبارسنجی شدند و مطابقت خوبی با داده‌های تجربی موجود در ادبیات نشان دادند. اثر تغییرات فشار در دماهای مختلف بر تبخیر قطره بررسی شد. مشاهده شد که در یک دمای ثابت با افزایش فشار تا 2 مگاپاسکال، عمر قطره افزایش یافته ولی افزایش فشار به 5_/2 مگاپاسکال منجربه کاهش عمر قطره می‌شود. رفتار تبخیری قطره با ترکیبات مختلف تغییری نداشت. نقش معادلات حالت مختلف بر پیش‌بینی عمر قطره مطالعه شده و درنهایت تأثیر فشار و دمای محیط بر فوق بحرانیشدن دمای سطح قطره بررسی‌ و مشاهده شد که در فشار و دمای به ‌اندازه کافی زیاد قطره می‌تواند به حالت بحرانی برسد.

کلیدواژه‌ها

موضوعات

انتقال حرارت- انتقال جرم

عنوان مقاله [English]

Transient evaporation of a bi-component droplet at high temperature and pressure

نویسنده [English]

Hojat Ghasseim ²

² School of Mechanical Engineering, Iran University of Science and Technology

چکیده [English]

Transient evaporation of a bi-component droplet at high temperature and pressure condition has been modeled numerically. In the gas phase, the equations of species, momentum, and energy, and in the liquid phase, the equations of species and energy by assuming fugacity equilibrium, and Peng-Robinson equation of state using the finite volume method have been solved. The droplet is assumed to be spherical, the solubility of the gas in the liquid and effect of gravity have been neglected. The results of the proposed model for heptane-hexadecane droplet in various temperatures and pressures have been validated against the available experimental data. Results were in good agreement. The effect of pressure on the evaporation showed that at a constant temperature, by increasing pressure up to 2 MPa the droplet lifetime increases but further increase in pressure (up to 2.5 MPa) reduces droplet lifetime. Evaporation behavior does not change with different compositions. The role of different equations of state on the prediction of binary droplet lifetime was studied, and finally the effect of ambient temperature and pressure on the surface temperature of the droplet was investigated. It was observed that at high enough pressure and temperature, the droplet surface could reach the critical condition.

کلیدواژه‌ها [English]

droplet evaporation
bi-component
high ambient pressure
fugacity
Peng-Robinson

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