【作者】 黄永红； 李念平；

【Author】 Huang Yonghong Li Nianping ( College of Energy & Power Engineering, Changsha Univ. of Sci. & Tech., Changsha 410076; College of Civil Engineering, Hunan University, Changsha 410082)

【机构】 长沙理工大学能源与动力工程学院； 湖南大学土木工程学院；

【摘要】 基于两方程模型和壁面函数法,编制了一个应用程序,并运用此程序在广泛的参数范围内对空调房间内的气流流动和传热进行了数值模拟,得到了相应的速度场、温度场及其它物理量场的分布．在此基础上,进一步分析了底面努谢尔特数随计算控制参数的变化过程．计算和分析表明,对空调房间内紊流混合对流换热问题,阿基米德数Ar的大小反映出自然对流与强制对流成分的对比关系．阿基米德数Ar约等于1时,自然对流成分与强迫对流成分相当,流动和换热呈现混合对流的特征。更多还原

【Abstract】 A numerical investigation is made of turbulent hybrid convective heat transfer which has been widely applied in engineering. The flow and heat transfer in an air-conditioned room with multiple inlets and outlets are studied in this paper. Based on two-equation model and wall function, an application program is developed to simulate the indoor airflow and heat transfer at a large range of parameters. The velocity fields, temperature fields and other fields, are obtained, based on which the process of the bottom Nu number changing with the controlling parameters of computation is further analyzed. The computation and analyses show that for the issue of turbulent hybrid convective heat transfer, the Ar number is the measure of the relative effectiveness of natural convection and forced convection. When Ar number is about 1 ,the effectiveness of natural convection and that of forced convection are comparable, thus the flow and heat transfer characterize hybrid convection.更多还原