مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

انتقال تابش گذرا در محیط‌های با ضریب شکست متغیر واقع بین استوانه‌های هم‌مرکز و کره‌های هم‌مرکز با استفاده از روش انتقال مجزا

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشکده مهندسی مکانیک، دانشگاه صنعتی شیراز، شیراز، ایران
2 گروه مهندسی مکانیک، دانشگاه شهید باهنر کرمان، کرمان، ایران
10.48311/mme.2025.96882.0
چکیده
در این پژوهش، حل عددی معادله انتقال تابش گذرا در یک محیط نیمه‌شفاف با ضریب شکست متغیر، واقع در میان دو استوانه یا کره هم‌ مرکز، مورد بررسی قرار گرفته است. با بهره‌گیری از روش انتقال مجزا (Discrete Transfer Method) و با در نظر گرفتن تقارن هندسی، ناحیه محاسباتی به یک قطاع استوانه‌ای یا کروی محدود شده است. با تقسیم‌بندی دامنه به المان‌های حلقوی یا کروی و تفکیک زاویه‌ای به زوایای فضایی مشخص، امکان ردیابی دقیق پرتوهای تابشی در محیط فراهم شده است. به‌منظور کاهش زمان محاسبات، از یک الگوریتم سریع برای رهگیری پرتو استفاده شده است. این مسئله برای محیط‌های صادرکننده و جذب‌کننده با پراکندگی آیزوتروپیک، و در شرایط مختلف توزیع ضریب شکست (خطی و ناپیوسته) تحلیل شده است. نتایج به‌دست‌آمده نشان می‌دهد که روش انتقال مجزا قابلیت مناسبی در تحلیل پدیده‌ی تابش گذرا در این‌گونه محیط‌ها دارد و می‌تواند رفتار شار حرارتی را با دقت بالایی پیش‌بینی کند.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Transient Radiative Transfer in Variable Index Media Between Concentric Cylinders and Spheres Using the Discrete Transfer Method

نویسندگان English

Amir Dehghanian 1
Seyed Masoud Hosseini Sarvari 2
1 Department of Mechanical Engineering, Shiraz University of Technology, Shiraz, Iran
2 Mechanical Engineering Department, Shahid Bahonar University of Kerman, Kerman, Iran
چکیده English

In this study, the transient radiative transfer equation is numerically solved within a semi-transparent medium with a variable refractive index, located between two concentric cylinders or spheres. Utilizing the Discrete Transfer Method (DTM) and considering the geometric symmetry, the computational domain is reduced to a cylindrical or spherical sector. The domain is discretized into annular or spherical elements, and the angular space is divided into numerous discrete solid angles, allowing for the accurate tracking of radiative rays within the medium. To reduce computational time, a fast ray tracing algorithm is employed. The problem is analyzed for absorbing, emitting media with isotropic scattering and various refractive index distributions, including linear and discontinuous profiles. The obtained results demonstrate that the Discrete Transfer Method is a reliable and accurate approach for analyzing transient radiative heat transfer phenomena in such media, and it can effectively predict the behavior of radiative heat flux through such media

کلیدواژه‌ها English

Transient Radiative Transfer, Semi-transparent Medium, Discrete Transfer Method, Variable Refractive Index
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