사각 전도체가 존재하는 수평 밀폐계 내부의 자연대류 현상에 대한 수치적 연구

Abstract

The physical model considered here is a horizontal layer of fluid heated below and cold above With a conducting body placed at the center of the layer. The body has dimensionless thermal conductivities to the fluid of 0.1, 1 and 50 Two-dimensional solution for unsteady natural convection is obtained using an accurate and efficient Chebyshev spectral methodology for different Rayleigh numbers. Multi-domain technique 15 used to handle a square-shaped Conducting body. The results for the case of a conducting body are also compared to those of adiabatic and neutral Isothermal bodies When the dimensionless thermal conductivity is 0.1, a pattern of fluid flow and Isotherms and the corresponding tune-averaged surface Nusselt number are almost the same as the case of an adiabatic body When the dimensionless thermal conductivity is 50, a pattern of flow and isotherm and the corresponding surface and tune-averaged Nusselt number are similar to those of neutral body The results for the case of dimensionless thermal conductivity of unity are also compared to those of pure natural convection<br/>