مطالعه آزمایشگاهی و مقایسه‌ای خواص ترموفیزیکی نانوسیالات مختلف با هدف انتخاب بهترین نانوروانکار

نوع مقاله : گرایش پیشرانش و انتقال حرارت

نویسنده

استادیار، دانشکده فنی و مهندسی، دانشگاه جامع امام حسین(ع)، تهران، ایران

چکیده

در این پژوهش، تأثیر نسبت نانوذرات در عملکرد ویسکوزیته روغن پایه مورد بررسی قرار گرفت. آزمایش‌ها در دمای °C 55-5، کسر حجمی %1-05/0 و نرخ برش‌های s-1 10664-5/666 انجام شدند. هدف این مطالعه، دستیابی به مشخصات نانوروانکار بهینه است. نتایج آزمایشگاهی نشان داد که نانوسیالات دارای رفتاری غیرنیوتنی و از نوع شبه‌پلاستیک هستند. بیش‌ترین افت ویسکوزیته برای MWCNT/Al2O3 (10%:90%)-10W40 و MWCNT/Al2O3 (40%:960%)-10W40 به ترتیب به میزان %13/8- و %85/10- بدست آمد. برآیند بررسی‌ها نشان می‌دهد که نانوروغن MWCNT/Al2O3 (10%:90%)-10W40 نسبت به نانوروغن رقیب عملکرد روانکاری بهتری را در شرایط استارت (روانایی بهتر روغن) و حرکت موتور (رفتار کنترل شده‌تر) داشته است. با استفاده از روش سطح پاسخ، برای پیش بینی داده‌های پاسخ هدف، مدل تجربی سه متغیره-سه درجه‌ای نرمالاییزه شده با مشخصات تابع انتقال توانی، 15/0- λ= و مقدار ثابت برابر با صفر ارائه‌گردید. حاشیه انحراف "72/2-" %<MOD<"66/2" % محاسبه گردید. آنالیز حساسیت ویسکوزیته نشان داده که با افزودن نانوذره در کسرحجمی های بالا، حساسیت به تغییرات در ویسکوزیته بیشتر شده است.

کلیدواژه‌ها


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دوره 18، شماره 2 - شماره پیاپی 68
شماره پیاپی 68، فصلنامه تابستان
مرداد 1401
صفحه 125-142
  • تاریخ دریافت: 13 اسفند 1400
  • تاریخ بازنگری: 20 فروردین 1401
  • تاریخ پذیرش: 01 خرداد 1401
  • تاریخ انتشار: 01 مرداد 1401