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مطالعه عددی تاثیر ضریب سرعت لغزشی بر روی مشخصه های جریان و انتقال گرما نانوسیال غیرنیوتونی آب/کربوکسی متیل سلولز-اکسید مس در یک میکرولوله افقی | ||
مهندسی مکانیک دانشگاه تبریز | ||
مقاله 12، دوره 47، شماره 4، بهمن 1396، صفحه 99-108 اصل مقاله (476.54 K) | ||
نوع مقاله: مقاله پژوهشی | ||
نویسندگان | ||
احمدرضا رحمتی* 1؛ علی مرزبان2؛ امیدعلی اکبری3 | ||
1استادیار، دانشکده مهندسی مکانیک، دانشگاه کاشان، کاشان، ایران | ||
2دانشجوی دکتری، دانشکده مهندسی مکانیک، دانشگاه کاشان، کاشان، ایران | ||
3دانشجوی دکتری، باشگاه پژوهشگران جوان و نخبگان، واحد خمینی شهر، دانشگاه آزاد اسلامی، واحد خمینی شهر، ایران | ||
چکیده | ||
در این تحقیق، جریان لایهای و انتقال گرمای نانوسیال غیرنیوتونی محلول کربوکسی متیل سلولز (CMC) با غلظت5/0 درصد وزنی به روش عددی بررسی میشود. نانوذرات جامد شامل کسر حجمی 1 و 5/1 درصد نانوذره اکسید مس با قطر نانوذره معادل nm 100 میباشند. همچنین در این بررسی اثرات ضریب سرعت لغزشی بیبعد در حالتهای0-0.1 b*= نیز مورد توجه است. جریان لایهای و انتقال گرما نانوسیال غیرنیوتونی در یک میکرولوله افقی دو بعدی با طول mm L=200 و قطرهیدرولیکی معادل mm =3 Dh شبیهسازی عددی میشود. به دیوارهی میکرولوله افقیشار گرمایی ثابت معادل W/m21000 اعمال میشود. محدوده اعداد رینولدز این پژوهش بین2000 100≤ Re ≤است. در این تحقیق، تأثیر ضریب سرعت لغزشی، کسر حجمی نانوذرات اکسید مس و عدد رینولدز بر پارامترهای جریان و انتقال گرما نانوسیال غیرنیوتونی مدنظر است. نتایج این مطالعه به صورت نمودارهای، عدد ناسلت، ضریب اصطکاک و سرعت و دمای بیبعد ترسیم میشوند. نتایج این مطالعه نشان میدهد که افزایش کسر حجمی نانوذره جامد و ضریب سرعت لغزشی باعث افزایش انتقال گرما میشود. همچنین افزایش ضریب سرعت لغزشی تاثیر زیادی در کاهش ضریب اصطکاک در دیواره میکرولوله افقی دارد. | ||
کلیدواژهها | ||
ضریب سرعت لغزشی؛ نانوسیال غیرنیوتونی؛ کربوکسی متیل سلولز؛ میکرولوله افقی؛ انتقال گرما | ||
مراجع | ||
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