超临界二氧化碳水平管内传热的数值模拟及与实验对比  

Numerical simulation and comparison with experiment of heat transfer of supercritical dioxide carbon in horizontal tube

作　　者：诸凯[1] 侯晓飞[1] 秦娜[2] 吕静[3] 

机构地区：[1]天津商业大学天津市制冷技术重点实验室,天津300134 [2]天津大学机械工程学院,天津300072 [3]上海理工大学城市建设与环境工程学院,上海200093

出　　处：《热科学与技术》2008年第1期17-22,共6页Journal of Thermal Science and Technology

基　　金：天津自然科学基金项目(05YEJMJCO6200)

摘　　要：以二氧化碳为研究对象,应用k-ε方法对其在水平管内与管外水成垂直交叉冷却的换热进行了分析。用FLUENT软件模拟了超临界二氧化碳在8、10 MPa,流量为3.4、6.8 g/s,管径6 mm,壁厚1.1 mm,长400mm的管中流动的状况;计算了平均换热系数h、Nu和Re的变化;并将10 MPa、3.4 g/s时数值模拟得出的换热系数与实验进行了比较和分析。得出等热流密度下壁面温度的变化情况,数值模拟的换热曲线和实验测量的结果具有相同的趋势,在准临界点处都达到最大值。The heat transfer of dioxide carbon in horizontal tube with cross-flow water was analyzed by κ-ε model. The flow of supercritical dioxide carbon in a 0.4 m-long horizontal tube with 6 mm of diameter, thickness of 1.1 mm was simulated by FLUENT software under the condition of 8 MPa, 10 MPa of dioxide carbon pressure and 3.4 g/s , 6.8 g/s of flow rate. The variations of the average heat transfer coefficient h, and were calculated. The heat transfer coefficients simulated of 3.4 g/s flow rate and 10 MPa were compared with experimental results. The variation of wall temperature under the equal heat flux was attained. It can be concluded that heat transfer curve simulated, which is similar to experimental one in tendency, reaches to the maximum near pseudo-critical point.

关 键 词：二氧化碳 超临界 对流换热 数值模拟 

分 类 号：TB124[理学—工程力学]