【摘要】 对圆管内物性随温度变化的吸收-各向同性散射介质的湍流入口段,数值研究了定热流加热下辐射与湍流正在发展流耦合换热的稳态热流特征．采用低雷诺数k-ε模型与SIMPLEC算法求解湍流流动与对流换热,采用蒙特卡罗法求解辐射换热;根据耦合换热温度场,采用等权抽样的蒙特卡罗法计算辐射热流。通过模拟计算,给出了介质内的耦合换热辐射热流与导热热流分布。通过分析介质光学厚度、散射反照率、壁面黑度对热流的影响,得出一些有价值的结论．更多还原

【Abstract】 For the turbulent developing flow of absorbing and isotropic scattering medium in a circular tube, the steady state heat flux of the coupled heat transfer of turbulent convection and thermal radiation under constant wall heat flux was investigated numerically. The turbulent flow and convective heat transfer was simulated by the low Renolds number k -εmodel and the SIMPLEC algorithm, and the radiative heat transfer was solved by the Monte Carlo method. After obtaining the temperature in medium, the radiative heat flux was calculated by the Monte Carlo method with weight-equivalent sampling. The effects of the optical thickness and scattering albedo of medium and that of wall emissivity on the radiatire and conductive heat fluxes were analyzed, and some valuable conclusions were obtained.更多还原