نشریه مهندسی مکانیک امیرکبیر

نشریه مهندسی مکانیک امیرکبیر

بررسی عددی افزایش انتقال حرارت جابجایی طبیعی در یک محفظه مستطیلی بلند در حضور سه استوانه چرخان

نوع مقاله : مقاله پژوهشی

نویسنده
دانشکده مهندسی شیمی و صنایع، دانشگاه علم و فناوری مازندران، بهشهر، ایران.
چکیده
در مقاله کنونی، تأثیر چیدمان‌های مختلف سه استوانه چرخان درون یک محفظه بسته مستطیلی بلند بر الگوی جریان و افزایش انتقال حرارت جابجایی طبیعی به صورت عددی بررسی شده است. از روش حجم محدود با فرض دوبعدی، دائم و تک فاز برای حل معادلات جریان و انرژی استفاده گردید. تأثیر پارامترهایی همچون چیدمان استوانه‌ها (پیکربندی 1 الی 5)، سرعت زاویه‌ای (5- الی 5+)، و جهت چرخش استوانه‌‌ها نسبت به یکدیگر بر الگوی جریان، توان لازم برای چرخش استوانه‌ها و افزایش نرخ انتقال حرارت درون محفظه ارزیابی شده است. نتایج نشان می‎دهد که حضور سه استوانه درون محفظه در تمامی حالات (ساکن یا چرخان) موجب تغییر الگوی جریان جابجایی طبیعی درون محفظه شده، به نحوی که گردابه ناشی از جابجایی طبیعی به چندین گردابه با اندازه‌های متفاوت تبدیل می‌شود. نتایج حاکی از آن است که چرخش استوانه‌ها در جهت پادساعتگرد در مقایسه با جهت ساعتگرد موجب افزایش بیشتر عدد ناسلت می‌گردد. نتایج نشان می‎دهد که با چرخش هم‌زمان استوانه‌ها در یک راستا، بیشترین افزایش عدد ناسلت نسبت به محفظه بدون استوانه، برای پیکربندی 1 به ازای سرعت زاویه‌ای 5- رخ داده و در حدود %47/6 می‌باشد. همچنین نتایج حاکی از آن است که با تغییر چرخش مستقل هر یک از استوانه‌ها به ترتیب با سرعت زاویه‌ای ω_1=+5، ω_2=+5 و ω_3=-5 برای پیکربندی 1، عدد ناسلت متوسط حدود 66% افزایش می‌یابد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Numerical Investigation of Natural Convection Heat Transfer Enhancement in a Tall Rectangular Enclosure by Three Rotating Cylinders

نویسنده English

Hesam Moayedi
Faculty of Chemical and Industrial Engineering, University of Science and Technology of Mazandaran, Behshahr, Iran
چکیده English

This study numerically investigates the effects of different arrangements of three rotating cylinders inside a tall rectangular enclosure on the flow pattern and enhancement of natural convection heat transfer. The two-dimensional, steady, single-phase flow and energy equations were solved using the finite volume method. The impact of parameters such as cylinder configurations (1 to 5), angular velocities (from -5 to +5), and relative rotation directions on the flow pattern, power required to rotate the cylinders, and heat transfer rate enhancement inside the enclosure was evaluated. Results were compared with a cylinder-free enclosure under various conditions. The presence of three cylinders, whether stationary or rotating, altered the natural convection flow pattern by splitting the primary vortex into multiple vortices of varying sizes. Counterclockwise rotation of the cylinders resulted in a greater increase in the Nusselt number compared to clockwise rotation. The greatest Nusselt number enhancement, about 47.6%, occurred in the configuration 1 at an angular velocity of -5 when all cylinders rotated synchronously. Additionally, independent rotation of cylinders with angular velocities ω=+5, ω=+5, and ω=-5 in configuration 1, increased the average Nusselt number by approximately 66%.

کلیدواژه‌ها English

Heat Transfer Enhancement
Finite Volume Method
Natural Convection
Cylinder Arrangement
Angular Velocity
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