Turbulent heat transfer in open cavities is relevant in several thermal engineering applications. However, the influence of thermal radiation has not been thoroughly studied yet. In this work, experimental and numerical results were obtained to analyze turbulent natural convection coupled with surface thermal radiation in a cubic open cavity. Two emissivities were considered (0.98 and 0.03). Experimental temperature profiles were obtained at six different depths and heights consisting of 14 thermocouples each. Five turbulence models were evaluated against experimental data. The radiative heat transfer model was solved with the discrete ordinate method. The validated model was used to analyze temperature fields and flow patterns in different open cavities configurations, which are presented and discussed. The effect of thermal radiation on experimental heat transfer coefficients was quantified. It was found that experimental heat transfer coefficients increase between 8.5% and 12.52% when the emissivity of the walls changes from 0.03 to 0.98. The temperature distribution in the vertical adiabatic walls changes significantly when emissivity increases from ε=0.03 to ε=0.98 and thus have a relevant influence on the flow patterns in the open cavity.

在开放型腔中的湍流传热与几种热工程应用有关。但是，热辐射的影响尚未得到充分研究。在这项工作中，获得了实验和数值结果，以分析立方开放腔中的湍流自然对流和表面热辐射。考虑了两个发射率（0.98和0.03）。在六个不同的深度和高度分别获得了实验温度曲线，每个深度和高度分别由14个热电偶组成。根据实验数据评估了五个湍流模型。用离散纵坐标法求解了辐射传热模型。经过验证的模型用于分析不同开口腔配置中的温度场和流型，并进行了介绍和讨论。量化了热辐射对实验传热系数的影响。发现当壁的发射率从0.03变化到0.98时，实验传热系数在8.5％和12.52％之间增加。当发射率从ε= 0.03增大到ε= 0.98时，垂直绝热壁中的温度分布会发生显着变化，从而对开放腔中的流动模式产生相关影响。