بررسی کارایی مدل تعادل جمعیت در پیش‌بینی رفتار انتقال حرارتی جریان دوغاب یخ درون لوله

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده‌ی مهندسی مکانیک، دانشگاه شیراز، شیراز، ایران.

چکیده

در پژوهش حاضر به بررسی کارایی مدل تعادل جمعیت در شبیه‌سازی جریان دوغاب یخ پرداخته شده است. هدف، رفع نقص مطالعات پیشین بوده است، که تغییر اندازه‌ی ذرات یخ را نادیده می‌گرفتند. نتایج نشان داده است که استفاده از مدل تعادل جمعیت، خطای محاسباتی را در جریان‌های آشفته با کسر حجمی کمتر از ۱۰٪، به زیر ۵٪ کاهش می‌دهد. همچنین مشخص شده است که افزایش کسر حجمی و سرعت جریان، باعث بزرگ‌ترشدن میانگین قطر ذرات می‌شود. با بررسی مکانیزم‌های مختلف تجمیع و شکست ذرات مشخص شده است که ترکیب پیشنهادی لوو، دقیق‌ترین نتایج را در مقایسه با داده‌های تجربی به دست می‌دهد. نتایج نشان داده است که توزیع اندازه‌ی ذرات به محدوده‌ی مجاز قطر در مدل بستگی دارد. درنهایت، محدوده‌ی بهینه برای استفاده از سیستم‌های دوغاب یخ بین ۱۰ تا ۲۰ درصد حجمی یخ تعیین شده است، زیرا در خارج از محدوده‌ی ذکرشده، ضریب انتقال حرارت کاهش و افت فشار به‌شدت افزایش می‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the Effectiveness of the Population Balance Model for Predicting Thermal Transfer Characteristics of Ice Slurry Flow within a Pipe

نویسندگان [English]

  • Mohammad Amin Alavi Nobandegani
  • Hossein Ali Pakravan
School of Mechanical Engineering, Shiraz University, Shiraz, Iran.
چکیده [English]

In this research, we performed a detailed numerical investigation into the effectiveness of the Population Balance Model (PBM) for simulating the complex phenomena of particle aggregation and breakage. The results demonstrated a substantial improvement in prediction accuracy when the PBM is integrated into the simulation framework. Specifically, for turbulent flows with a volume fraction below 10%, the PBM was shown to reduce calculation errors to less than 5%. Our findings also reveal a direct correlation between increased volume fraction and flow velocity, and an increase in the average particle diameter within the flow. Further analysis evaluated different aggregation and breakage mechanisms. These were tested within the PBM framework. The combination proposed by Luo proved to be the most effective, yielding more reliable results than other models. This was consistent across both laminar and turbulent flow regimes and was consistently validated against experimental data. We also examined how the predefined range of allowable particle diameters within the PBM influences the results. Our investigation highlighted a strong dependency between this parameter and the distribution of the average particle diameter across the pipe's cross-section.

کلیدواژه‌ها [English]

  • Ice slurry
  • Population balance model
  • Breakage
  • Aggregation
  • Particle size distribution

مراجع

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