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The Effect of Nanoparticle Shape on Hydrothermal Performance and Entropy Generation of Boehmit Alumina Nanofluid in a Cylindrical Heat Sink with Helical Minichannels | ||
Journal of Heat and Mass Transfer Research | ||
دوره 9، شماره 1 - شماره پیاپی 17، مرداد 2022، صفحه 85-98 اصل مقاله (651.29 K) | ||
نوع مقاله: Full Length Research Article | ||
شناسه دیجیتال (DOI): 10.22075/jhmtr.2022.22797.1332 | ||
نویسندگان | ||
Alireza Falahat* 1؛ Reza Bahoosh2 | ||
1Department of Mechanical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran | ||
2Department of Mechanical Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
تاریخ دریافت: 11 اسفند 1399، تاریخ بازنگری: 12 خرداد 1401، تاریخ پذیرش: 16 خرداد 1401 | ||
چکیده | ||
In the present paper, heat transfer, fluid flow characteristics and entropy generation of boehmite alumina nanofluid flowing through a cylindrical helical minichannels heat sink are examined numerically. The evaluated boehmite alumina nanofluid contain dispersed platelets, cylindrical, bricks and blades nanoparticles in a water. This evaluation is performed at two Reynolds number (i.e. Re=114.5 and Re=481.5) and four nanoparticle volume fraction (i.e., φ= 0, 1%, 2% and 4%). The numerical Results reveal that the heat transfer, friction factor, pumping power, thermal performance factor an friction entropy generation are augmented and overall thermal resistance, heat transfer entropy generation, total entropy generation and augmentation entropy generation number are diminished by increasing Reynolds number and nanoparticle volume fraction for all studied shapes of nanoparticle. The highest and lowest heat transfer, friction factor, pumping power, thermal performance factor and friction entropy generation relate to the nanofluid containing platelets and bricks shapes nanoparticle, while the maximum and minimum overall thermal resistance, heat transfer entropy generation and total entropy generation belong to the nanofluid with the bricks and platelets shapes nanoparticle. The highest performance factor was achieved for φ= 4%, Re=114.5 by using platelets shape nanoparticles and this value is about 1.477. | ||
کلیدواژهها | ||
Cylindrical heat sink؛ helical minichannels؛ nanoparticle shape؛ heat transfer؛ entropy generation | ||
عنوان مقاله [English] | ||
تاثیر شکل نانوذره بر کارایی گرمایی-هیدرولیکی و تولید انتروپی نانوسیال بوهمیت آلومینا در یک چاه گرمایی استوانه ای با مینی کانال های مارپیچ | ||
چکیده [English] | ||
در این مقاله، مشخصات انتقال حرارت و جریان سیال و تولید آنتروپی نانوسیال بوهمیت آلومینا در چاه گرمایی استوانه ای با مینی کانال های مارپیچی بصورت عددی انجام شده است. نانوسیال بوهمیت آلومینا مورد نظر شامل نانوذرات با شکل صفحه ای، استوانه ای، مکعبی و پره ای پراکنده شده در آب می باشد. این بررسی در دو عدد رینولدز (5/114 و 5/481) و پهار غلظت حجمی (0، 1%، 2% و %4) انجام شده است. نتایج عددی نشان می دهد که انتقال حرارت، ضریب اصطکاک، توان پمپاژ، فاکتور کارایی گرمایی و تولید آنتروپی اصطکاکی افزایش می یابد و مقاومت گرمایی کلی، تولید آنتروپی گرمایی، تولید آنتروپی کل و عدد افزایش تولید آنتروپی با افزایش عدد رینولدز و غلظت حجمی نانوذره برای شکل های نانوذره مورد مطالعه، کاهش می یابد. بالاترین و کمترین انتقال گرما، ضریب اصطکاک، توان پمپاژ، ضریب کارایی گرمایی و تولید آنتروپی اصطکاکی به ترتیب مربوط به نانوسیال شامل نانوذرات با شکل صفحه ای و مکعبی می باشد، در صورتیکه ماکزیمم و مینیمم مقاومت گرمایی کلی، تولید آنتروپی گرمایی و تولید آنتروپی کل به ترتیب متعلق به نانوذراتی با شکل های مکعبی و صفحه ای می باشد. بالاترین ضریب کارایی گرمایی در غلظت حجمی %4، رینولدز 5/114 با نانوذره صفحه ای بدست می آید و مقدار آن حدود 477/1 می باشد. | ||
کلیدواژهها [English] | ||
چاه گرمایی استوانه ای, مینی کانال مارپیچی, شکل نانوذره, انتقال گرما, تولید آنتروپی | ||
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