Numerical simulation of heat transfer and fluid flow due to convection and radiation in an enclosure
Publish place: The 32nd annual international conference of the Iranian Society of Mechanical Engineers
Publish Year: 1403
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ISME32_101
تاریخ نمایه سازی: 15 تیر 1403
Abstract:
This paper investigates natural convection in a two-dimensional square cavity filled with air, where the vertical walls have different temperatures and the horizontal walls are thermally insulated. The finite element method in COMSOL software is used for the numerical solution. The study covers pure natural convection with Rayleigh numbers ranging from ۱ to ۱۰۶, and its interaction with surface radiation with emissivity from ۰ to ۰.۶. The results are shown as isotherms, pressure, current and so on. The study reveals that for Rayleigh numbers below ۱۰۰, the fluid has a vertical temperature gradient due to conduction only, without any convective motion. Surface radiation does not affect the fluid dynamics equations, but only changes the thermal boundary conditions. The link between natural convection and surface radiation is through the thermal boundary conditions only. The emissivity of the walls has no impact on the temperature isotherms.
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Authors
Najmeh Hajialighol
Mechanical Engineering Department, Hamedan University of Technology, Hamedan
Mostafa Jamali
Mechanical Engineering Department, Hamedan University of Technology, Hamedan