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گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه الزهرا، تهران، ایران
چکیده
در مقاله حاضر، تاثیر افزودن نانوذرات آلومینا بر تبخیر قطرات سوخت دیزل مورد تحلیل عددی قرار گرفته است. نانوسوختحاصلازافزودن 5/0 و 1 درصدحجمی ذرات آلومینا به سوخت پایه دیزلبه‌صورت تکفازدرنظرگرفتهشدهاست. جریان دو فاز متشکل از قطرات سوخت و هوای ورودی با نگرش اویلر-لاگرانژ مدلسازی شده است. همچنین، برای تحلیل مشخصههای جریان واکنشیآشفتهرهیافت متوسط‌گیری رینولدز ناویر استوکس به همراه مدل انتقال حرارت تشعشعی جهات مجزا و مدل احتراقی فلیملت پایا بهکارگرفتهشدهاست. بهمنظوراطمینان از صحت نتایج مقایسههایی با نتایج تجربی انجام شده است. نتایج حاکی از آن است که با افزودن نانوذرات آلومینا، ظرفیت گرمایی و طول عمر قطرات سوخت افزایش مییابد. هم چنین، عمق نفوذ قطرات در حضور نانوذرات بیشتر شده و قطرات در فواصل دورتری از ورودی تبخیر میشوند. ایننکته بیان‌گر کاهش نرخ تبخیر قطرات سوخت دیزل در حضور نانوذرات آلومینا است.
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