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

عنوان مقاله [English]

Buoyancy Force Influence on the Hydrodynamics and Thermal Behaviors of Mixed Convection Flow of a Radiating Gas in a Duct with Recess

نویسندگان [English]

  • Meysam Atashafrooz 1
  • Tahereh Asadi 2
1 Department of Mechanical Engineering, Sirjan University of Technology, Sirjan, Iran
2 Department of Chemical Engineering, Sirjan University of Technology, Sirjan, Iran
چکیده [English]

In the present research, the effects of buoyancy force and radiative parameters on the hydrodynamic and thermal behaviors of mixed convection flow of a radiating gas in an inclined two-dimensional duct with a trapezoidal recess are studied and investigated. This recess is created inside the duct by two inclined backward and forward facing steps. For modeling the inclined surfaces of this recess in the Cartesian coordinates, the Blocked region method is used. To obtain the velocity and temperature fields, the dimensionless forms of the governing equations are solved using the finite volume method and by applying the Simple algorithm. The discrete-ordinates method is used to calculate the divergence of the radiative heat flux in the energy equation. The results of the numerical solution show that with increasing the Grashof number and duct inclination angle, the values of the mean bulk temperature along the recess and also the values of the friction coefficient and heat transfer rates on the bottom wall of recess increase. Besides, an increase in the magnitudes of radiation-conduction parameter and optical thickness results in an enhancement in the values of the mean bulk temperature and total Nusselt number along the bottom wall of recess; while these values decrease by increasing the magnitudes of albedo coefficient.

کلیدواژه‌ها [English]

  • Combined Heat Transfer
  • Recess
  • Mixed Convection
  • Radiative Medium
  • Buoyancy Force

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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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