مطالعه تجربی رفتار رئولوژیکی نانوسیال هیبریدی MgO-MWCNT/5W-50 : پیشنهاد یک رابطه تجربی سه متغیره

همت اسفه, محمد; عباسیان آرانی, علی اکبر; اسفنده, سعید

مطالعه تجربی رفتار رئولوژیکی نانوسیال هیبریدی MgO-MWCNT/5W-50 : پیشنهاد یک رابطه تجربی سه متغیره

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشگاه امام حسین (ع)

² دانشگاه کاشان

چکیده

پژوهش حاضر به بررسی رفتار رئولوژیکی نانوسیال هیبریدی اکسید منیزیم (%65) _‌نانولوله کربنی (%35) در سیال پایه روغنی 50w-5 پرداخته است. ویسکوزیته نانوسیال مورد بررسی در بازه دمایی 5 الی 55 درجه (در 6 دما) و در بازه کسرحجمی 05/0 الی 1 درصد (در 6 کسرحجمی) مورد بررسی قرار گرفته و اثر این دو پارامتر (دما و کسرحجمی) به همراه اثر تغییرات نرخ برش در بازه s-15/665 الی s-111997 بر تغییرات ویسکوزیته نانوسیال مطالعه شده است. نتایج حاصل از برازش منحنی‌های توانی روی داده‌های حاصل از نتایج آزمایشگاهی و دست‌یابی به مقادیر ضریب تعیین (R2) بسیار نزدیک به مقدار واحد نشان از رفتار غیرنیوتنی نانوسیال مذکور در تمامی کسرهای حجمی و دماها دارد. به منظور پیش‌بینی مقادیر ویسکوزیته به‌ازای دما، کسرحجمی و نرخ برش‌های مختلف نیز یک رابطه تجربی جدید )999/0 (R2 = متأثر از سه متغیر پیشنهاد شده است. کاهش ویسکوزیته نانوسیال نسبت به سیال پایه در کسر حجمی‌های 05/0، 1/0 و 25/0 درصد نیز از دیگر نتایج جالب توجه این پژوهش می‌باشد.

کلیدواژه‌ها

20.1001.1.23223278.1396.6.2.2.1

عنوان مقاله [English]

Experimental Study of Rheological Behavior of MgO-MWCNT/5W-50 Hybrid Nanofluid: Proposing a New Three-variable Correlation

نویسندگان [English]

mohammad hemat asfe ¹
ali akbar abasian arani ²

¹ emam hosein

² kashan

چکیده [English]

In the present study, the rheological behavior of hybrid nanofluid (MgO(65%) – MWCNT(35%)/5w50) has been studied. the viscosity of mentioned nanofluid was measured at 5oC- 55oC and 0% – 1% volume fraction range. then the effect of these two parameters on viscosity was studied. Also, the effect of shear rate changes (665.5 s -1 - 11997 s -1 ) on viscosity changes was studied. Fitting power law curves on experimental data and achieve R 2 's with very close to unity was considered as a sign of non-Newtonian behavior of present nanofluid. In order to forecast viscosity quantities as functions of solid volume fraction, temperature, and shear rate, a novel three variable correlation has been proposed (with R 2 =0.999). Viscosity reduction of nanofluid in comparison with the base oil in solid volume fractions of 0.05%, 0.1%, and 0.25% is another remarkable result of the present study.

کلیدواژه‌ها [English]

Oil-based Hybrid Nanofluid
Viscosity Reduction
Tri-variable Experimental Correlation

مراجع

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