تأثیر نیروی شناوری بر رفتارهای هیدرودینامیکی و حرارتی جریان جابه‌جایی ترکیبی یک گاز تشعشعی در یک کانال دارای فرورفتگی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه صنعتی سیرجان، سیرجان، ایران

2 دانشکده مهندسی شیمی، دانشگاه صنعتی سیرجان، سیرجان، ایران

چکیده

در تحقیق حاضر، اثرات نیروی شناوری و پارامترهای تشعشعی بر رفتارهای هیدرودینامیکی و حرارتی جریان جابه‌جایی ترکیبی یک گاز تشعشعی در یک کانال شیب‌دار دوبعدی و دارای یک فرورفتگی ذوزنقه­ای شکل، مورد مطالعه و بررسی قرار می­گیرد. این فرورفتگی توسط دو پله شیب‌دار متوالی پسرو و پیشرو، درون کانال ایجاد می­شود. برای مدل‌سازی سطوح شیب‌دار این فرورفتگی در مختصات کارتزین، از روش ناحیه مسدود شده استفاده می­شود. برای به‌دست آوردن میدان‌های سرعت و دما، فرم بدون بعد معادلات حاکم با استفاده از روش حجم محدود و با به‌کارگیری الگوریتم سیمپل حل می‌شود. برای محاسبه دیورژانس شار تشعشعی در معادله انرژی، از روش راستاهای مجزا استفاده می­شود. نتایج حل عددی نشان می­دهد که با افزایش عدد گراشف و شیب کانال، مقادیر دمای متوسط مخلوط در طول فرورفتگی و همچنین مقادیر ضریب اصطکاک و نرخ انتقال حرارت روی دیوار پایینی فرورفتگی افزایش می­یابند. همچنین، هر افزایشی در مقادیر پارامتر تشعشع-هدایت و عمق اپتیکی منجر به افزایش مقادیر دمای متوسط مخلوط و عدد ناسلت کل روی دیوار پایینی فرورفتگی می­شود؛ در حالی‌که با افزایش ضریب البدو، این مقادیر کاهش می­یابند.

کلیدواژه‌ها

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  • تاریخ دریافت: 04 اردیبهشت 1399
  • تاریخ بازنگری: 19 تیر 1399
  • تاریخ پذیرش: 04 بهمن 1399
  • تاریخ انتشار: 01 تیر 1399

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