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مطالعه آزمایشگاهی و مقایسهای خواص ترموفیزیکی نانوسیالات مختلف با هدف انتخاب بهترین نانوروانکار | ||
مکانیک هوافضا | ||
مقاله 9، دوره 18، شماره 2 - شماره پیاپی 68، مرداد 1401، صفحه 125-142 اصل مقاله (2 M) | ||
نوع مقاله: گرایش پیشرانش و انتقال حرارت | ||
نویسنده | ||
محمد همت اسفه* | ||
استادیار، دانشکده فنی و مهندسی، دانشگاه جامع امام حسین(ع)، تهران، ایران | ||
تاریخ دریافت: 13 اسفند 1400، تاریخ بازنگری: 20 فروردین 1401، تاریخ پذیرش: 01 خرداد 1401 | ||
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 | ||
نانوسیالات هیبریدی؛ ویسکوزیته؛ MWCNT؛ مقایسه خواص ترموفیزیکی؛ RSM؛ بررسی تجربی | ||
عنوان مقاله [English] | ||
Experimental and Comparative Study of Thermophysical Properties of Different Nanofluids with the Aim of Selecting the Best Nanolubricant | ||
نویسندگان [English] | ||
Mohammad Hemmat Esfe | ||
Assistant Professor, Department of Mechanical Engineering, Imam Hossein University, Tehran, Iran | ||
چکیده [English] | ||
In this study, the effect of the ratio of different nanoparticle compositions on the viscosity performance of the base oil is investigated. The aim of this study is to achieve the characteristics of optimal nanolubricants. The experiments are performed at temperatures of 5-55°C, volume fractions of 0.05-1% and shear rates of 665.5-10664s-1. Experimental results showed that nanofluids have a non-Newtonian and quasi-plastic behavior. The maximum viscosity reductions are obtained for MWCNT / Al2O3 (10%: 90%) - 10W40 and MWCNT / Al2O3 (40%: 960%) - 10W40 at -8.13% and -10.85%, respectively. The results show that MWCNT / Al2O3 (10%: 90%)/10W40 nanofluids have better lubrication performance at engine start (lower oil viscosity) and engine movement (more controlled behavior) than competing nanofliud. Using the response level method, to predict the target response data, a normalized three-variable-three-degree model with the characteristics of the power transfer function, λ = -0.15 and a constant value equal to zero is presented. Margin of deviation is in the range of -"2.72" %<MOD<"2/66" %. More viscosity sensitivity also occurred at higher volume fractions. | ||
کلیدواژهها [English] | ||
Hybrid nanofluids, Viscosity, MWCNT Comparison of thermophysical properties, RSM, Experimental investigation | ||
مراجع | ||
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