مطالعه آزمایشگاهی و شبیه‌سازی CFD انتقال حرارت راکتور پرشده تحت تأثیر دیواره: اثر شکل دانه کاتالیستی و حالت قرارگیری آن بر تشکیل نقاط داغ با استفاده از روش تاگوچی

نوع مقاله : ترویجی

نویسندگان

آزمایشگاه دینامیک سیالات محاسباتی، دانشکده مهندسی شیمی، نفت و گاز، دانشگاه علم و صنعت ایران

چکیده

در مطالعه حاضر انتقال حرارت تک‌دانه کاتالیستی (استوانه‌ای، استوانه‌ای شیاردار و سه‌پر) به ترتیب با نسبت قطر بستر به قطر دانه (N) 6/7، 5/1، 4/5 در مجاورت دیواره بستر به‌صورت آزمایشگاهی و عددی مطالعه شد. در قسمت عددی به‌منظور حل معادلات مومنتوم، پیوستگی و انرژی از روش اجزای محدود (FEM) استفاده گردید. به‌منظور اعتبارسنجی روش عددی از داده‌های آزمایشگاهی استفاده شد. نتایج نشان داد که سه ناحیه مهم در اطراف دانه وجود دارند: ناحیه سرعت‌پایین در مجاورت دانه، فضای بین دانه و دیواره و فضای پشت دانه. با کاهش فاصله دانه-دیواره تأثیر دیواره بر میزان انتقال حرارت بررسی شد. نتایج نشان داد که دانه استوانه‌ای و استوانه‌ای شیاردار برای 0/143 ≥yc/Dp ایجاد نقطه داغ می‌کنند و زوایای 90=θz و 60=θa بیش‌ترین احتمال ایجاد نقاط داغ را دارند. درنهایت با استفاده از روش تاگوچی به بررسی حالت قرارگیری بهینه دانه در مجاورت دیواره پرداخته شد.

کلیدواژه‌ها


عنوان مقاله [English]

Experimental Study and CFD Simulation of Heat Transfer Fixed Bed Affected by The wall: Particle Rotation and Location Effects on Hot Spots Creation Using Taguchi Method

نویسندگان [English]

  • Mahdi Zare
  • Seyed Hassan Hashemabadi
Computational Fluid Dynamics (CFD) Research Laboratory, School of Chemical, Petroleum, and Gas Engineering. Iran University of Science and Technology
چکیده [English]

In this study, the heat transfer of a single catalyst particle (cylindrical, sg-cylindrical, and tri-lobe) beside the bed wall was studied experimentally and numerically with the bed to particle diameter ration (N) of 4.5, 5.1, 6.7 respectively. In the numerical section, the Finite Element Method (FEM) was applied to solve the momentum, continuity, and Energy. Experimental data was used to validate the numerical results. The results showed that three are the important area around the catalyst particle: low-velocity fluid around the particle, space between the particle and bed wall, and space behind the particle. The wall effects on the heat transfer were studied by reducing the distance of the particle-bed wall. Results showed that cylindrical and sg-cylindrical particles face hot-spot for yc/Dp≤0.143 and θa=60 and θz=90 degrees are the highest probable degrees for hot-spot creation. Finally, the Taguchi method was used to find the optimized particle location around the bed wall.

کلیدواژه‌ها [English]

  • Cylindrical
  • Sg-Cylindrical
  • Tri-Lobe
  • Heat Transfer
  • Packed bed
  • Computational fluid dynamics
  • wall effects
  • Hot-Spot
  • Taguchi
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