مکانیک سیالات و آیرودینامیک

مکانیک سیالات و آیرودینامیک

اثر عامل‌های هندسی و جریان بر راندمان مبدل حرارتی پوسته و کویل با استفاده از نانوسیال

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی دکتری ، دانشگاه کاشان ، کاشان ، ایران
2 استاد ، دانشگاه کاشان ، کاشان ، ایران
چکیده
مبدل‌های حرارتی پوسته و لوله از پرکاربردترین دستگاه‌های حرارتی هستند. مبدل‌های حرارتی کویل مارپیچ ویژگی‌های انتقال حرارت بهتری نسبت به لوله مستقیم ارائه می‌دهند. اخیراً نانوسیال‌ها به دلیل خواص ترموفیزیکی بهبودیافته توجه محققان را به خود جلب کرده‌اند. این مطالعه، تحلیل عددی جامعی بر تأثیر عامل‌های هندسی و جریان بر عملکرد حرارتی مبدل حرارتی در حضور نانوسیال ارائه می‌دهد. مدل محاسباتی سه‌بعدی با گام کاهشی در جهات افقی و عمودی توسعه یافت و با پیکربندی‌های گام ثابت معمولی مقایسه شد. عامل‌های حرارتی - هیدرولیکی با استفاده از نرم‌افزار انسیس - فلوئنت تحلیل شدند. این تحقیق نشان می‌دهد استفاده از گام مارپیچ کاهشی عدد ناسلت و ضریب انتقال حرارت را حدود ۱۵-۲۰٪ افزایش می‌دهد، درحالی‌که افت فشار مرتبط تنها ۵-۸٪ افزایش می‌یابد. علاوه بر این، به‌کارگیری نانوسیال آب - تیتانیوم اکسید، راندمان حرارتی کلی را تا ۱۲٪ نسبت به سیال پایه بهبود بخشید. این نتایج تأیید می‌کنند که ترکیب هندسه مارپیچ بهینه‌شده با نانوسیال‌های مناسب می‌تواند عملکرد انتقال حرارت مبدل‌های حرارتی پوسته و کویل را به طور قابل‌توجهی ارتقا دهد و بینش‌های ارزشمندی برای طراحی کارآمد انرژی ارائه کند
کلیدواژه‌ها

عنوان مقاله English

Geometric and Flow Parameters effects on the Efficiency of a Shell-and-Coil Heat Exchanger with Nanofluids

نویسندگان English

Saeid Hashemi Hashjin 1
Ali َ Akbar Abbasian Aran 2
1 PhD Student, University of Kashan, Kashan, Iran
2 Professor, University of Kashan, Kashan, Iran
چکیده English

Shell-and-tube heat exchangers are among the most used thermal devices. Owing to their curved configuration, offer superior characteristics. Recently, nanofluids have gained significant attention due to their enhanced thermophysical properties. This study presents a comprehensive investigation on the influence of geometric and flow parameters on the thermal performance employing nanofluids. A three-dimensional computational model featuring a decreasing helical pitch in both horizontal and vertical directions was developed and compared with conventional constant-pitch configurations. Key thermal–hydraulic parameters, including the Nusselt number, pressure drop, heat transfer coefficient, and overall thermal efficiency, were analyzed using ANSYS Fluent. The findings demonstrate that the use of a decreasing helical pitch can enhance the Nusselt number and heat transfer coefficient by approximately 15–20%, while the associated pressure drop increases only by 5–8%. Furthermore, employing TiO₂-water nanofluid improved the overall thermal efficiency by up to 12% compared with the base fluid. These results confirm that integrating an optimized helical geometry with suitable nanofluids can substantially improve the heat transfer performance of shell-and-coil heat exchangers, offering valuable insights for energy-efficient industrial design.

کلیدواژه‌ها English

Shell-and-coil Heat exchanger; Numerical simulation; Decreasing pitch; Thermal performance; TiO₂–waternan
Al₂O₃–water nanofluid

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