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Cooling of Two Hot Half-Cylinders through MHD Non-Newtonian Ferrofluid Free Convection under Heat Absorption; Investigation of Methods to Improve Thermal Performance via LBM | ||
Journal of Heat and Mass Transfer Research | ||
دوره 10، شماره 1 - شماره پیاپی 19، شهریور 2023، صفحه 67-86 اصل مقاله (2.27 M) | ||
نوع مقاله: Full Length Research Article | ||
شناسه دیجیتال (DOI): 10.22075/jhmtr.2023.30230.1430 | ||
نویسندگان | ||
Mohammad Nemati* 1؛ Mohammad Sefid* 1؛ Arash Karimipour2 | ||
1Faculty of Mechanical Engineering, Yazd University, Yazd, Iran | ||
2Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran | ||
تاریخ دریافت: 27 اسفند 1401، تاریخ بازنگری: 26 مرداد 1402، تاریخ پذیرش: 28 مرداد 1402 | ||
چکیده | ||
The cooling process of parts in limited spaces is of great interest to researchers due to its many applications in industries such as electronics. Therefore, achieving the best performance of such systems has always been one of the challenges facing researchers. Due to this necessity, in the present simulation via the lattice Boltzmann method (LBM), the cooling of two hot semi-cylinders via magnetohydrodynamics (MHD) free convection has been interrogated. The novelty of the available study compared to antecedent studies is the effect of a magnetic field (MF) in different types and heat absorption for cooling two hot objects embedded within a triangular enclosure comprising non-Newtonian ferrofluid, which has not been studied so far. The accuracy of the obtained results was guaranteed via the validation of the written code in comparison with other studies qualitatively and quantitatively. Based on the results, To have a larger the Nusselt (Nu) value, at the highest Rayleigh (Ra) value, it is sufficient to decline the fluid power-law (PL) index, heat absorption index and the Hartmann (Ha) value. The reduction of in the mean Nu value due to rise of the Ha value for the shear thinning fluid is about 59%, while it is about 38% and 21% for the Newtonian and the shear thickening fluids, respectively. The existence of heat absorption, in addition to reducing the Nu value by about 75% in highest value, for the shear thinning fluid, results in a decrease in the value of thermal performance index (ITP), which is very insignificant for the shear thickening fluid at Ha=60. The predominance of conduction over convection is the result of enhancing the PL index, which diminishes the effect of type and power of MF. For Ra=104, due to low convection effects, changing the type of MF is ineffective, while for Ra=106, this effect is highest. By changing the angle of inclination of the chamber and changing the arrangement of hot objects on the walls of the cavity, by changing the flow patterns, the thermal characteristics of the system can be strongly affected. In all cases, the trend of the ITP changes is in accordance with the trend of the mean Nu changes, which exhibits that HT has the largest share to production entropy (PE). | ||
کلیدواژهها | ||
Non-Newtonian ferrofluid free convection؛ Heat absorption؛ Entropy generation؛ Changing the hot objects position؛ Changing the form of applied magnetic field؛ Tilted right-triangular cavity | ||
عنوان مقاله [English] | ||
خنک سازی دو نیم سیلندر داغ از طریق جابجایی طبیعی فروسیال غیرنیوتنی تحت جذب گرما. بررسی روشهای بهبود عملکرد حرارتی بوسیله LBM | ||
چکیده [English] | ||
فرآیند خنکسازی قطعات در فضاهای محدود به دلیل کاربردهای فراوان در صنایعی مانند الکترونیک، همواره مورد توجه محققین بوده است. بنابراین دستیابی به بهترین عملکرد چنین سیستم هایی همواره یکی از چالشهای پیش روی دانشمندان این حوزه بوده است. با توجه به این ضرورت، در شبیهسازی حاضر به روش شبکه بولتزمن (LBM)، خنکسازی دو نیم سیلندر داغ از طریق جابجایی طبیعی مورد بررسی قرار گرفته است. ویژگی خاص این مطالعه، در مقایسه با مطالعات پیشین، تأثیر میدان مغناطیسی در شکلهای مختلف و جذب حرارت برای خنک کردن دو جسم داغ تعبیه شده روی دیواره های یک محفظه مثلثی حاوی فروسیال غیر نیوتنی است که تاکنون مورد مطالعه قرار نگرفته است. صحت نتایج بهدستآمده از طریق اعتبارسنجی کد نوشته شده در مقایسه با سایر مطالعات از نظر کمی و کیفی تضمین شد. بر اساس نتایج، برای داشتن مقدار ناسلت بزرگتر، در بالاترین مقدار رایلی، کافی است که شاخص توانی سیال، شاخص جذب گرما و مقدار هارتمن کاهش یابد. کاهش مقدار ناسلت در اثر افزایش مقدار هارتمن برای سیال رقیقشونده حدود 59 درصد است در حالی که این اثر برای سیال نیوتنی و غلیظشونده به ترتیب حدود 38% و 21% است. وجود جذب گرما علاوه بر کاهش مقدار ناسلت به میزان حدود 75% در بالاترین مقدار، برای سیال رقیقشونده، منجر به کاهش بارز مقدار شاخص عملکرد حرارتی می شود که این اثر برای سیال غلیظشونده به خصوص در عدد هارتمن ۶۰ بسیار ناچیز است. غلبه هدایت حرارتی بر جابجایی نتیجه افزایش مقدار شاخص توانی سیال است که تأثیر نوع و قدرت میدان مغناطیسی را کاهش میدهد. برای Ra=104، به دلیل کم بودن اثرات جابجایی، تغییر شکل میدان مغناطیسی اعمالی ناچیز است، در حالی که برای Ra=106، این اثر بیشترین مقدار را دارد. با تغییر زاویه تمایل محفظه و تغییر آرایش اجسام داغ بر روی دیوارههای محفظه، از طریق تغییر الگوهای جریان میتوان ویژگیهای حرارتی سیستم را به شدت تحت تاثیر قرار داد. در همه موارد، روند تغییرات شاخص عملکرد حرارتی سیستم مطابق با روند تغییرات مقدار ناسلت است که نشان میدهد انتقال حرارت بیشترین سهم را در تولید آنتروپی دارد. | ||
کلیدواژهها [English] | ||
انتقال حرارت جابجایی طبیعی فروسیال غیرنیوتنی, جذب حرارت, تولید آنتروپی, تغییر موقعیت قرارگیری اجسام داغ, تغییر نوع اعمال میدان مغناطیسی, محفظه مثلثی شکل متمایل | ||
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