شبیه‌سازی عددی تأثیر مکان استقرار جت‌های برخوردی بر انتقال حرارت جابه‌جایی از سطح مقعر استوانه‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

• رضا طریقی
• مهران رجبی زرگرآبادی

دانشگاه سمنان

10.22067/fum_mech.v27i2.42459

چکیده

این مقاله در مورد تأثیر جابه جایی افقی جت ها بر انتقال حرارت جابه‌جایی از سطح مقعر استوانه ای بحث می کند. در این راستا معادلات متوسط‌گیری شده برای جریان تراکم ناپذیر آشفته در حالت دایم به‌همراه دو مدل آشفتگی رایج و یک مدل رینولدز پایین به‌همراه تصحیح‌کنندۀ یاپ، در یک فضای محاسباتی سه‌بعدی حل شده اند. نتایج نشان می دهد که اعمال تصحیح یاپ به‌طور قابل ملاحظه‌ای منجر به اصلاح تخمین بیشینۀ عدد ناسلت در نقطۀ برخورد می‌شود. نتایج به‌دست آمده نشان می دهد که با کاهش فاصلۀ مرکز جت ها تا لبۀ خروجی صفحۀ مقعر بیشینه مقدار عدد ناسلت به‌سمت جریان بالادستی منتقل می‌شود و با نزدیک شدن جریان اصلی جت به ناحیۀ چرخشی ایجاد شده در بالا دست جریان، انرژی جنبشی آشفتگی در این ناحیه افزایش می‌یابد و همین امر سبب افزایش عدد ناسلت در ناحیۀ برخورد شده است.

کلیدواژه‌ها

• انتقال حرارت برخوردی
• جریان آشفته
• تصحیح یاپ
• عدد ناسلت

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عنوان مقاله [English]

Numerical Simulation of the Effect of the Location of Impinging Jets on the Convective Heat Transfer from a Cylindrical Concave Surface

نویسندگان [English]

• Reza Tarighi
• Mehran Rajabi Zargarabadi

Semnan University

چکیده [English]

This paper discusses the effect of the horizontal movement of impinging jets on the convective heat transfer from a cylindrical concave surface. In this way, the averaged Navier-Stokes equations for turbulent incompressible flow in a steady state considering two prevalent turbulence models and a Low-Re model with the Yap correction in the 3D computational space were solved. Results indicate that the Yap correction significantly improves the over-prediction of Nusselt number in the impingement zone. The results show that the decrease in the distance of the center of the jets to the outlet edge of the concave surface leads to the transfer of the maximum amount of the Nusselt number to the upstream flow, and the approach of the main flow of the jet to the recirculation region formed in the upstream flow results in the increase in the turbulent kinetic energy of this area and the Nusselt number in the stagnation point.

کلیدواژه‌ها [English]

• Impingement Heat Transfer
• Turbulent Flow
• Yap correction
• Nusselt Number

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