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مطالعه رفتار رئولوژیکی نانوسیال هیبریدی آب-اتیلن گلیکول/نانوآلومینا-نانوگرافن در دماهای پایین | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 10، دوره 54، شماره 4، تیر 1401، صفحه 905-924 اصل مقاله (1.29 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2021.20275.7206 | ||
| نویسندگان | ||
| نسیم نایب پاشایی* 1؛ سیدمحمدمهدی هادوی2 | ||
| 1پژوهشکده فناوری و مهندسی، پژوهشگاه استاندارد، البرز، ایران | ||
| 2دانشکده فنی و مهندسی، دانشگاه تربیت مدرس، تهران، ایران | ||
| چکیده | ||
| نانوسیالات که از توزیع ذرات با ابعاد نانو در سیال پایه حاصل می‌شوند، نسل جدیدی از سیالات با پتانسیل بسیار بالا در کاردبرد‌های صنعتی هستند. در این پژوهش، تأثیر دما و غلظت نانوذرات متشکل از نانوذرات آلومینا و نانوصفحات گرافن بر رفتار رئولوژیکی سیال پایه متشکل از آب و اتیلن گلیکول مورد مطالعه قرار گرفت. همچنین به میزان 0/2 درصد حجمی اولئیک اسید و 0/2درصد وزنی سدیم دودسیل سولفونات به عنوان ماده فعال سطحی برای پراکندگی نانوذرات به سیال پایه اضافه شدند. کسرحجمی نانوذرات 0/05، 0/1، 0/5، 1، 1/5، 2 و 2/5 درصد حجمی و دماهای مورد آزمایش در بازه دمائی 293-263 کلوین انتخاب شد. بررسی مورفولوژی و ریزساختار نانوذرات توسط میکروسکوپ الکترونی روبشی و میکروسکوپ الکترونی عبوری انجام شد. تشخیص فازهای نانوذرات به وسیله آنالیز تفرق اشعه ایکس انجام شد. همچنین مساحت ویژه و تخلخل نانوذرات تعیین شد. ویسکوزیته دینامیک نانوسیالات هیبریدی اندازه‌گیری و با سیال پایه مقایسه شد. نتایج نشان داد که خصوصیات رئولوژیکی نانوسیال خصوصاً در دماهای زیر صفر به دما و غلظت نانوذرات وابسته است. نمونه‌های نانوسیال هیبریدی با کسرهای حجمی جامد کمتر از0/5% رفتار نیوتنی داشتند، در حالی که نمونه‌های با کسرهای حجمی جامد بالاتر رفتار غیر نیوتنی رقیق‌گردانی برش را نشان می‌دهند. | ||
| کلیدواژه‌ها | ||
| نانوسیال هیبریدی؛ اتیلن گلیکول؛ ویسکوزیته؛ نانو ذرات آلومینا؛ نانوصفحات گرافن | ||
| عنوان مقاله [English] | ||
| Study of Rheological Behavior of Water-Ethylene Glycol /Nano Al2O3 –Nano Graphene Hybrid Nanofluid at Low Temperatures | ||
| نویسندگان [English] | ||
| nasim nayebpashaee1؛ Seyed Mohamad Mehdi Hadavi2 | ||
| 1Department of Metallurgy and Mechanical Engineering, Technology and Engineering Research Center, Standard Research Institute (SRI) | ||
| 2Corrosion Group, Faculty of Engineering, Tarbiat Modares University | ||
| چکیده [English] | ||
| Nanofluids are a new generation of fluids with very high potential in industrial applications. In this study, the effect of temperature and concentration of nanoparticles consisting of Al2O3 nanoparticles and graphene nanoplates on the rheological behavior of the base fluid consisting of water and ethylene glycol was studied. Also, 0.2%vol. of oleic acid and 0.2%wt. of sodium dodecyl sulfonate were added to the base fluid as a surfactant to disperse the nanoparticles. The volume fraction of nanoparticles in this study was considered 0.05, 0.1, 0.5, 1, 1.5, 2, and 2.5% by volume, and also to investigate the effect of temperature, the tested temperatures were selected in the temperature range of 263-293K. The morphology and microstructure of the nanoparticles were investigated by scanning and transmission electron microscopy. Detection of phases in nanoparticles was performed by X-Ray Diffraction analysis. Also, the specific area and porosity of nanoparticles were determined. The dynamic viscosity of hybrid nanofluids was measured and compared with the base fluid. The results showed that the rheological properties of nanofluid were dependent on temperature and nanoparticle concentration, especially at sub-zero temperatures. Hybrid nanofluid samples with solid volume fraction less than 0.5% showed Newtonian behavior, while samples with higher solid volume fractions showed non-Newtonian shear thinning behavior. | ||
| کلیدواژه‌ها [English] | ||
| Hybrid nanofluid, Ethylene glycol, Viscosity, Alumina nanoparticles, Graphene nanoplates | ||
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| مراجع | ||
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