مکانیک سیالات و آیرودینامیک

مکانیک سیالات و آیرودینامیک

بهبود عملکرد مکانیکی و حرارتی میکرو مبادله‌کن مایع-گاز با اشکال دیواره کسینوسی و ایرفویل NACA0012 با کاهش رسوب‌گیری

نوع مقاله : مقاله پژوهشی

نویسندگان
1 استادیار، دانشگاه امام علی(ع)، تهران، ایران
2 کارشناسی ارشد، دانشگاه امام علی(ع)، تهران، ایران
3 دانشیار، دانشگاه امام علی(ع)، تهران، ایران
چکیده
امروزه اهمیت استفاده از ابعاد ریز مانند میکرو و نانو روزبه‌روز بیشتر شده و یکی از مزایای کاربرد ابعاد میکرو کاهش وزن کلی رادیاتور و نیز رسیدن نرخ تبادل حرارت بیشتر به نسبت ابعاد رایج در صنایع با فرایندهای خنک کاری به‌خصوص در تبادل حرارتی سیالات مایع و گاز است. هدف اصلی در این پژوهش، بررسی پارامترهای مهم بی‌بعد جریان سیال مثل ضریب اصطکاک و عدد ناسلت است که در دبی‌ها و هندسه‌های مختلف با یکدیگر مقایسه و در آخر هندسه با بهترین عملکرد حرارتی معرفی می‌شود. یکی از راهکارهای افزایش عملکرد انتقال حرارتی در میکرو کانال‌ها، هندسه‌های جدید است که از میکرو کانال موجی شکل کسینوسی استفاده شد و جهت بهبود انتقال حرارت پارامترهای هندسی نظیر طول‌موج، دامنه موج و ارتفاع دهانه بررسی و سپس این هندسه بهبودیافته با دیواره ناهم‌سو با دو هندسه مواج دیواره همسو و دیواره با هندسه ایرفویل NACA0012 مقایسه شد. جهت انجام تحقیق ابتدا با استفاده از نرم‌افزار شبیه‌ساز کنیا هندسه‌های مختلف پژوهش رسم و سپس توسط نرم‌افزار فلوئنت با روش‌های حل عددی و استفاده از معادلات بقای جرم و مومنتوم و انرژی تحلیل می‌شوند. فرضیات مورداستفاده، جریان پایا و آرام و تراکم ناپذیر برای دسته معادلات است. ابعاد میکرو کانال پژوهش 0/3*20*310 میلی‌متر مکعب است. همچنین آب در دبی‌های مختلف از 1/5 تا 9 مترمکعب بر ساعت به‌صورت شرط مرزی معادل سرعت واردشده و به محیط با شرایط مرزی خروجی فشار خارج می‌گردد و دیواره‌ها نیز شرط عدم لغزش سیال و انتقال حرارت جابجایی را از هوای سرد 300 کلوین اطراف تجربه می‌کنند. در رادیاتورهای با کانال‌های مواج میکرو در پژوهش حاضر به بهبود انتقال حرارت 200 تا 350 درصدی نسبت به ابعاد مینی کانال و نیز کاهش وزن 58 درصدی نسبت به رادیاتور مرجع پژوهش رسیده شد. مشاهده شد هندسه با دیواره ایرفویل 33 درصد بهبود حرارتی نسبت به هندسه دیواره همسو و 49 درصد بهبود عملکرد مکانیک سیالاتی نسبت به مواج ناهم‌سو داشت. همچنین جهت مطالعه رسوب‌گیری با مقایسه سرعت متوسط در فاصله 150 میکرومتری نزدیک دیواره میکرو کانال مشاهده شد که 6/6 برابر بیشتر از دیواره مینی کانال بود.
کلیدواژه‌ها

عنوان مقاله English

Increasing the Mechanical and Thermal Performance of Liquid-Gas Micro Heat Exchangers with Cosine-Shaped and NACA0012 Airfoil Wall Geometries and Fouling Reduction

نویسندگان English

mohsen rostami 1
Ahmadreza Rahmati 2
amirhamzeh farajollahi 3
Javad Deldarsheikhi 2
1 Assistant Professor, Imam Ali University, Tehran, Iran
2 Master's degree, Imam Ali University, Tehran, Iran
3 Associate Professor, Imam Ali University, Tehran, Iran
چکیده English

The significance of employing micro- and nano-scale dimensions is increasingly recognized, with one key advantage being the reduction in overall radiator weight. Furthermore, utilizing micro-scale dimensions facilitates achieving higher heat transfer rates compared to conventional industrial scales, particularly in cooling processes involving liquid and gas fluids. This research primarily aims to investigate crucial dimensionless fluid flow parameters such as the friction factor and Nusselt number. These parameters are compared across various flow rates and geometries, ultimately identifying the geometry with the most favorable thermal performance. One approach to enhance heat transfer performance in microchannels involves novel geometries. In this study, a sinusoidal corrugated microchannel was employed. To improve heat transfer, geometric parameters such as wavelength, wave amplitude, and aperture height were investigated. Subsequently, this optimized geometry with misaligned walls was compared against both aligned-wall corrugated geometries and an airfoil-shaped geometry based on the NACA0012 profile. For the investigation, different geometries were initially designed using CATIA simulation software. Subsequently, they were analyzed using FLUENT software, employing numerical solution methods and applying the conservation equations for mass, momentum, and energy. The analysis assumes steady, laminar, and incompressible flow conditions. The dimensions of the microchannel are 0.3 mm x 20 mm x 310 mm. Water, as the working fluid, was introduced at various flow rates ranging from 1.5 to 9 cubic meters per hour, implemented as an equivalent velocity boundary condition. The outlet was subjected to a pressure outlet boundary condition, and the walls experienced a no-slip condition and convective heat transfer from the surrounding 300 K cold air. In the corrugated microchannel radiators examined in this study, heat transfer enhancement of 200% to 350% was achieved compared to mini-channel dimensions, along with a 58% weight reduction compared to a reference radiator. The airfoil-shaped geometry exhibited a 33% improvement in thermal performance compared to the aligned-wall geometry and a 49% improvement in fluid-dynamic performance compared to the misaligned corrugated geometry. Furthermore, a study of fouling, comparing average velocities at a distance of 150 micrometers near the microchannel wall, revealed values 6.6 times higher than those observed in the mini-channel walls.

کلیدواژه‌ها English

Microheat Exchanger
Performance Enhancement
Wavy Wall
Airfoil Wall
Fouling

Smiley face

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دوره 14، شماره 1 - شماره پیاپی 35
بهار و تابستان
شهریور 1404
صفحه 105-122

  • تاریخ دریافت 17 خرداد 1404
  • تاریخ بازنگری 30 تیر 1404
  • تاریخ پذیرش 24 مرداد 1404
  • تاریخ انتشار 01 شهریور 1404