بررسی ویژگی‌های نانوسیالات و چالش‌های استـفاده از آنها برای بهبود انتقال حرارت

نوع مقاله : علمی ترویجی

نویسندگان

1 دانشجوی دکتری مهندسی مکانیک دانشگاه کاشان

2 دانشیار دانشکدة مهندسی مکانیک دانشگاه کاشان

چکیده

نانوسیالات خواص ترموفیزیکی سیال پایه را به‌شدت تغییر می‌دهند. پژوهش‌ها نشان می‌دهند که انتقال حرارت نانوسیالات نسبت به سیالات پایة رایج افزایش بسیار خوبی دارند. این رفتار به عواملی چون شکل نانوذرات، توزیع اندازه و کسر حجمی آنها، دما، ضریب هدایت حرارتی نانوذرات و سیال پایه بستگی دارد. این مقاله با تأکید بر افزایش انتقال حرارت نانوسیالات، مرور جدیدی بر فرمول‌بندی، پایداری، سازوکارهای ممکن برای افزایش هدایت حرارتی و مدل‌کردن عددی نانوسیال ارائه می‌دهد. در این مقاله ویژگی‌های انواع نانوسیالات (تهیه‌شده با نانوذرات اکسید آلومینا، اکسید مس، اکسید روی، مس و آهن که غالباً در تحقیقات نانوسیال استفاده می‌شوند و سیالات پایة معمولی کاربردی برای انتقال حرارت مانند آب، اتیلن گلیکول و روغن) به اجمال ارائه و نتایج حاصل از تحقیقات صورت‌گرفته با هم مقایسه می‌شوند. اما باید توجه داشت که به‌منظور درک تمامی عوامل مؤثر در افزایش ضریب هدایت حرارتی نانوسیالات به مطالعات محاسباتی و تجربی بیشتری نیاز است.

کلیدواژه‌ها


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