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مطالعه تجربی تأثیر پارامترهای مؤثر بر ضریب هدایت حرارتی نانوسیال هیبریدی پنج جزئی | ||
| مکانیک هوافضا | ||
| مقاله 10، دوره 18، شماره 3 - شماره پیاپی 69، مهر 1401، صفحه 141-154 اصل مقاله (1.83 M) | ||
| نوع مقاله: گرایش پیشرانش و انتقال حرارت | ||
| نویسندگان | ||
| محمد همت اسفه* 1؛ سیدمجید مطلبی2 | ||
| 1نویسنده مسئول: دانشیار، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه جامع امام حسین (ع)، تهران، ایران | ||
| 2کارشناسی ارشد، گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه جامع امام حسین (ع)، تهران، ایران | ||
| تاریخ دریافت: 01 خرداد 1401، تاریخ بازنگری: 01 مرداد 1401، تاریخ پذیرش: 24 مرداد 1401 | ||
| چکیده | ||
| در این پژوهش رفتار حرارتی نانوسیال هیبریدی پنج جزئی بر پایه برای نخستین‌بار در شرایط آزمایشگاهی مختلف مورد تجزیه و تحلیل و بررسی قرار گرفت. بررسی این نانوسیال با توجه به اهمیت نانولوله‌های کربنی و اینکه نانوسیالات هیبریدی دارای خواص ویژه‌ای هستند و کم بودن مطالعاتی با حضور سه نانوذره و دو سیال پایه، دارای اهمیت است. اندازه‌گیری‌های تجربی ضریب هدایت حرارتی توسط دستگاه KD2 Pro در کسرحجمی‌های %9/0-%05/0 و دماهای انجام گردید. برای شناسایی، تأیید ساختار و مورفولوژی نانوذرات از روش‌های عکس‌برداری TEM، SEM و آنالیز XRD استفاده گردید. نتایج نشان داد که ضریب هدایت حرارتی نسبی در کسر حجمی‌ها و دماهای بالا، بسیار بیش‌تر از کسرحجمی‌های پایین است. علت این موضوع، افزایش انرژی جنبشی و حضور بیش‌تر نانوذرات است. همچنین افزایش دما تأثیر کمی بر روی افزایش ضریب هدایت حرارتی نسبی داشت. بیش‌ترین افزایش ضریب هدایت حرارتی به میزان %3/28 در کسر حجمی و دمای 9/0 و °C 50 به ترتیب حاصل شد. کمترین افزایش ضریب هدایت حرارتی به میزان %4/1 در دمای °C 26 و کسر حجمی%05/0 بدست آمد. مدل ارائه شده برای پیش بینی ضریب هدایت حرارتی نانوسیال با استفاده از روش سطح پاسخ دارای دقت خوبی بود به گونه‌ای که تطابق خوبی بین نتایج مدلسازی و داده‌های آزمایشگاهی وجود دارد. مقادیر ، ، ، و بیانگر دقت خوب مدلسازی هستند. نتایج آنالیز حساسیت نیز بیانگر افزایش میزان حساسیت با افزایش کسر حجمی نانوذرات است. | ||
| کلیدواژه‌ها | ||
| نانوسیالات هیبریدی؛ ضریب هدایت حرارتی؛ مطالعه تجربی؛ اعتبار سنجی مدل | ||
| عنوان مقاله [English] | ||
| Experimental Study of the Effect of Effective Parameters on the Thermal Conductivity of a Five-component Hybrid Nanofluid | ||
| نویسندگان [English] | ||
| Mohammad Hemmat Esfe1؛ Sayyid Majid Motallebi2 | ||
| 1Corresponding author: Associate Professor, Department of Mechanical Engineering, Faculty of Engineering, Imam Hossein University, Tehran, Iran | ||
| 2MSc, Department of Chemical Engineering, Faculty of Engineering, Imam Hossein University, Tehran, Iran | ||
| چکیده [English] | ||
| In this study, the thermal behavior of a five-component hybrid nanofluid Al2O3(40%)/SiO2(45%)/MWCNT(15%)-Water(60%)/EG(40%) for the first time in different laboratory conditions is analyzed. The study of this nanofluid is important because of the importance of carbon nanotubes, the fact that hybrid nanofluids have special properties and the few studies with the presence of three nanoparticles and two base fluids. Experimental measurements of thermal conductivity are performed by KD2 Pro in volumetric fractions of 0.05-0.9% and temperatures of 26-50°C. TEM, SEM and XRD analysis methods are used to identify and confirm the structure and morphology of nanoparticles. The results show that the relative thermal conductivity in the high volume fraction and temperatures is much higher than the low volume fraction. This is due to the increased kinetic energy and the presence of more nanoparticles. Also, increasing the temperature has a small effect on increasing the relative thermal conductivity. The highest increase in thermal conductivity is 28.3% in volume fraction and temperature of 0.9% and 50 ° C, respectively. The lowest increase in thermal conductivity is 1.4% at 26 ° C and volume fraction of 0.05%. The proposed model for predicting the thermal conductivity of nanofluid using the response surface method is so accurate that there is a good agreement between the modeling results and laboratory data. The values of R-squared=0.9936, CV%=0.55, -1.85%<MOD< 0.91%, p-value<0.05 and F-value=1059.23 indicate good modeling accuracy. The results of sensitivity analysis also indicate an increase in sensitivity with increasing volume fraction of nanoparticles. | ||
| کلیدواژه‌ها [English] | ||
| Hybrid nanofluids, Thermal conductivity, Experimental study, Model validation | ||
| مراجع | ||
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