‌مطالعه عددی و تحلیل حساسیت در مبادله کن‌های گرمایی لوله‌ای دارای حلقه‌های مخروطی سوراخ‌دار حامل نانوسیال آب- اکسید آلومینیوم

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه ارومیه، ارومیه، ایران

چکیده

در این مقاله، رفتار هیدرودینامیکی و انتقال حرارت جریان آشفته نانوسیال در یک مبادله کن مجهز به حلقه‌های مخروطی سوراخ‌دار به‌صورت عددی شبیه‌سازی شده است. سیال پایه آب و نانوذرات اکسید آلومینیوم با درصد وزنی صفر تا 5 درصد به عنوان نانوذرات افزایش دهنده انتقال گرما در نظر گرفته شده است. معادلات حاکم با استفاده از روش دینامیک سیالات محاسباتی به کمک نرم‌افزار انسیس - فلوئنت و در محدوده عدد رینولدز 12000-2000 حل شده است. پس از صحت‌سنجی روش حل عددی با نتایج تجربی موجود، تأثیر پارامترهای هندسی و مشخصات جریان مانند عدد رینولدز، تعداد حلقه‌های مورد استفاده، تعداد سوراخ‌های مورد استفاده و کسر حجمی نانوذرات بر مشخصات انتقال گرمای مبادله کن گرمایی مطالعه شده است. نتایج نشان می‌دهد، استفاده از حلقه‌های مخروطی سوراخ‌دار تأثیر قابل ملاحظه‌ای بر بهبود انتقال گرما در مبادله کن‌های گرمایی دارد و این روش می‌تواند در کاربردهای عملی مورد استفاده قرار گیرد. نتایج نشان می‌دهد با افزایش تعداد حلقه‌های مخروطی، کاهش تعداد سوراخ‌های آن و بیشتر شدن کسر وزنی نانوذرات، عدد ناسلت و ضریب اصطکاک افزایش می‌یابد. بر اساس نتایج مشاهده می‌شود که حلقه مخروطی ارائه شده می‌تواند عدد ناسلت متوسط را 5/3 برابر نسبت به لوله بدون حلقه افزایش دهد. علاوه بر این، نانوذرات اکسید آلومینیوم نیز تأثیر مطلوبی بر افزایش انتقال گرما داشته و با افزایش کسر حجمی نانوذرات اکسید آلومینیوم از صفر درصد تا 5 درصد، عدد ناسلت به ازای یک حلقه مخروطی دارای سه سوراخ بر روی آن در حدود 92 درصد افزایش در عدد ناسلت مشاهده شده است.‌

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical Study and Sensitivity Analysis in Tubular Heat Exchangers with Perforated Conical Rings Carrying Water-Aluminum Oxide Nanofluid

نویسندگان [English]

  • Mohsen Mohammadi
  • seyed mehdi pesteei
university of urmia
چکیده [English]

In this paper, the hydrodynamic behavior and heat transfer of a nanofluid turbulent flow in an exchanger equipped with perforated conical rings are simulated numerically. Water-based fluid and Al2O3 nanoparticles with a weight percentage of zero to 5% are considered as nanoparticles that increase heat transfer. The governing equations are solved using the computational fluid dynamics method with the help of ANSYS-Fluent software in the range of Reynolds 12000-2000. After validation of the numerical solution method with the available experimental results, the effect of geometric parameters and flow characteristics such as Reynolds number, number of rings used, number of holes used and volume fraction of nanoparticles on the heat transfer characteristics of the heat exchanger have been studied. The results show that the use of perforated conical rings has a significant effect on improving heat transfer in heat exchangers and this method can be used in practical applications. The results show that with increasing the number of conical rings, decreasing the number of holes, and increasing the weight fraction of nanoparticles, the Nusselt number and the coefficient of friction increase. Based on the results, it can be seen that the proposed loop can increase the Nusselt number by 5.3 times compared to the tube without the loop. In addition, Al2O3 nanoparticles have a favorable effect on increasing heat transfer and with increasing the volume fraction of Al2O3 nanoparticles from zero to 5%, Nusselt number per m = 1 and n = 3 about 92% increase in Nusselt number has been observed.

کلیدواژه‌ها [English]

  • Perforated conical rings
  • Al2O3 nanoparticles
  • Numerical analysis
  • Sensitivity analysis
  • Heat exchanger

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نشریه مهندسی مکانیک امیرکبیر
دوره 54، شماره 1
فروردین 1401
صفحه 189-210

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