مطالعه عددی تأثیر شکاف روی انتقال حرارت و افت فشار سیال عبوری از روی مانع استوانه‌ای

حسن زاده افروزی, حمید; سیدی تاجی, سید مصطفی; قادری, آتنا

doi:10.48301/kssa.2025.496677.3112

مطالعه عددی تأثیر شکاف روی انتقال حرارت و افت فشار سیال عبوری از روی مانع استوانه‌ای

نوع مقاله : مقاله پژوهشی (توسعه ای)

نویسندگان

حمید حسن زاده افروزی ¹

سید مصطفی سیدی تاجی ²

آتنا قادری ³

¹ گروه مهندسی مکانیک، دانشگاه ملی مهارت، تهران، ایران

² گروه مهندسی مکانیک، دانشگاه ملی مهارت، تهران، ایران.

³ استادیار، گروه مهندسی مکانیک، موسسه آموزش عالی روزبهان، ساری، ایران

10.48301/kssa.2025.496677.3112

چکیده

جریان سیال در اطراف یک سیلندر دوار (یا بین دو سیلندر دوار) یک اتفاق رایج در انواع فرآیندهای صنعتی است. این عملیات می‌تواند از خشک‌کن‌های سیلندر تماسی در فرآیندهای شیمیایی، فرآوری مواد غذایی، کاغذ‌سازی و صنایع نساجی گرفته تا دستگاه‌های خنک‌کننده استوانه‌ای در صنایع شیشه و پلاستیک باشد. در این مقاله، میدان جریان و انتقال حرارت بر روی مانع استوانه‌ای به صورت عددی مورد مطالعه قرار گرفته است. در این تحقیق، تاثیرات زاویه قرارگیری مانع استوانه‌ای (0° ≤ 𝛼≤ 90°)، ضخامت شکاف (0 ≤ S/D ≤ 0.2) و عدد رینولدز (100 ≤ Re ≤ 400) بر الگوی جریان آرام دوبعدی، افت فشار سیال و ویژگی‌های انتقال حرارت مورد تجزیه و تحلیل قرار گرفته است تا میزان اثربخشی این تغییرات بر روی هر یک از پارامترهای هیدرودینامیکی و انتقال حرارت سیال مورد بررسی قرار گیرد. نتایج به دست آمده از بررسی عبور جریان و انتقال حرارت نشان می‌دهد که در حالتی که استوانه مورد نظر دارای شکاف باشد عملکرد حرارتی بهتری نسبت به حالت استوانه ساده خواهد داشت. همچنین بهترین عملکرد حرارتی در حالتی است که شکاف روی استوانه در حالت 60 درجه نسبت به حالت افق قرار داشته باشد. از طرفی، نتایج به دست آمده به منظور بررسی تاثیر نسبت نشان می‌دهد که در نسبت شکاف S/D=0.1 بهترین عملکرد می‌باشد. بنابراین به منظور عملکرد حرارتی بهتر مانع استوانه‌ای از نظر حرارتی (دارای بیشترین مقدار انتقال حرارت)، پیشنهاد می‌گردد که دارای نسبت شکاف 0.1 و زاویه 60 درجه قرار داشته باشد.

کلیدواژه‌ها

انتقال حرارت

شبیه سازی عددی

استوانه

زاویه مانع

ضخامت شکاف

موضوعات

تبدیل انرژی

عنوان مقاله English

Numerical study of the effect of a gap on heat transfer and pressure drop of a fluid passing over a cylindrical barrier

نویسندگان English

hamid Hassanzadeh Afrouzi ¹

Seyyed Mostafa Seyyedi Taji ²

Atena Ghaderi ³

¹ Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran.

² Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran

³ Department of Mechanical Engineering, University College of Rouzbahan, Rouzbahan, Iran,

چکیده English

Fluid flow around a rotating cylinder (or between two rotating cylinders) is a common phenomenon in various industrial processes. These processes range from contact drum dryers in chemical processing, food manufacturing, papermaking, and textile industries to cylindrical cooling devices used in glass and plastics industries. This study numerically investigates the flow field and heat transfer over a cylindrical obstacle. The effects of the cylinder’s orientation angle (0° ≤ 𝛼 ≤ 90°), gap thickness (0 ≤ S/D ≤ 0.2), and Reynolds number (100 ≤ Re ≤ 400) on the two-dimensional laminar flow patterns, pressure drop, and heat transfer characteristics are analyzed to assess the impact of these parameters on the hydrodynamic and thermal performance of the fluid flow. The results indicate that a cylinder with a gap exhibits superior thermal performance compared to a simple cylinder. The optimal thermal performance is achieved when the gap on the cylinder is oriented at 60 degrees relative to the horizontal axis. Furthermore, the study highlights that the best heat transfer efficiency is observed at a gap ratio of S/D=0.1S/D = 0.1. Based on these findings, it is recommended that for enhanced heat transfer, the cylindrical obstacle should have a gap ratio of S/D = 0.1 and be oriented at a 60-degree angle.

کلیدواژه‌ها English

Heat transfer

numerical simulation

cylinder

obstacle angle

slit thickness

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