حل مسئله تابش-نفوذ دوجزئی گذرا در فشارهای پایین بین دو صفحه تخت در یک محیط خاکستری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، دانشگاه سیستان و بلوچستان، زاهدان، ایران

2 عضو هیئت علمی دانشگاه سیستان و بلوچستان، دانشکده مهندسی شهید نیکبخت، گروه مهندسی مکانیک، زاهدان، ایران

چکیده

در این مقاله یک مسئله تابش-نفوذ دوجزئی گذرا با زمان به‌صورت عددی حل شده است. هدف از حل این مسئله بررسی تأثیر چگالی گاز جاذب تابشی در فشارهای پایین روی توزیع دمای محیط برحسب مکان و زمان و میزان انتقال حرارت از محیط تابشی برحسب زمان، در دو حالت تعادل تابشی و دمای ثابت محیط است. به‌منظور حل مسئله تابش از روش جهات مجزای تصحیح شده و برای حل مسئله نفوذ گذرا بازمان از روش ضمنی حجم محدود استفاده شده است. مسئله در دو حالت گذرا و پایا مورد تحلیل قرار گرفت و مشاهده شد که تأثیر زمانی چگالی باعث تأثیر زمانی در توزیع دمای محیط با تعادل تابشی شده و این تأثیر در حالات با ضریب جذب جرمی 1 و 10 قابل صرفنظر کردن نیست. همچنین به علت در نظر گرفتن ضریب نفوذ به‌صورت تابعی از دما، اتصال مسئله نفوذ با تابش، منجر به وابستگی چگالی جزء جاذب به دما شده است به گون‌های که از تأثیرات چگالی برحسب دما نمی‌توان صرف‌نظر کرد. تحلیل مسئله نشان می‌دهد که اگرچه برای بازه‌های زمانی در نظر گرفته‌شده، معادله تابش به شکل پایا حل می‌شود اما نمی‌توان از تأثیر زمانی آن به واسطه تغییرات چگالی گاز جاذب در فشارهای پایین صرف‌نظر کرد. با تحلیل مسئله مشخص شد که تأثیرپذیری دمایی چگالی در حالت تعادل تابشی نسبت به ضریب نفوذ بیشتر است. این تأثیر در ضرایب جذب جرمی 1 و 10 مشهود بوده و اهمیت در نظر گرفتن تابعیت ضریب نفوذ برحسب دما را تأکید می‌کند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Solution of the Transient Diffusion-Radiation Binary Gas mixture Problem in Low Pressure Values between Two Flat Plates at a Gray Medium

نویسندگان [English]

  • sohila mohammadpour 1
  • samira payan 2
1 department of mechanical engineering, University of Sistan and Baluchestan, Zahedan, Iran
2 Department of mechanical engineering, University of Sistan and Baluchestan, Zahedan, Iran
چکیده [English]

In this research, a transient two-component radiation-penetration problem is solved numerically. This study aims at investigating the effect of the radiated absorbing gas density in low pressure values on the distribution of the medium temperature in terms of the time, position, and the amount of heat transferred from the radiation environment in terms of the time in two modes of radiation equilibrium and constant temperature of the medium. The modified discrete ordinates method was used to solve the radiation problem; while, the implicit finite volume method was used to solve the transient time penetration problem. The results were observed that the time effect of density led to the time effects on the ambient temperature distribution with a radiated balance and the effects cannot be neglected in states with 1 and 10 mass absorption coefficients. The problem analysis shows that although the radiation equation can be solved in a steady manner for the time interval of interest, one cannot neglect its time effects due to changes in the density of adsorbing gas even at low pressures. By analyzing the problem, it was determined that the temperature effect on density during the radiation equilibrium is rather than the penetration coefficient. This effect is not negligible in 1 and 10 mass absorbing coefficients; therefore this subject emphasizes the importance of considering the penetration coefficient in terms of temperature

کلیدواژه‌ها [English]

  • Transient Radiation-two-component diffusion؛ Radiation equilibrium؛ Discrete ordinates method
  • gray medium
  • Temperature-varying penetration coefficient
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