平板对流换热的(火用)传递特性研究  

Investigation on exergy transfer characteristics of forced convection through external flow of flat plate

作　　者：张友利[1] 吴双应[2] 宋长华[1] 

机构地区：[1]重庆电力高等专科学校动力工程系,重庆400053 [2]重庆大学动力工程学院,重庆400044

出　　处：《热科学与技术》2008年第3期231-235,共5页Journal of Thermal Science and Technology

摘　　要：通过对平板紊流对流换热的火用传递特性进行分析,定义了两个无因次量——局部传火用Nu及平均传火用Nu,并给出相关表达式;以空气为介质,详细讨论了平板几何尺寸、Re及其他运行参数对传火用Nu的影响,并将传火用与传热性能作了比较,为工程中确定合理的运行参数及最佳结构参数提供参考。The exergy transfer characteristics of turbulent forced convection through external flow of flat plate were analyzed. The local and mean exergy transfer Nusselt numbers were defined to incorporate into exergy transfer analysis. The analytical expressions for the non-dimenslonal local and mean exergy transfer Nusselt numbers were obtained to describe the exergy transfer performance over a flat plate. By taking air as a working fluid, the influences of flat plate geometric parameters, Reynolds number and other operating parameters on the exergy transfer Nusselt numbers were discussed in detail. Furthermore, the exergy transfer characteristics was compared with heat transfer characteristics. The results provide a reference for determining the rational operating and optimal geometric parameters in engineering.

关 键 词：平板 对流换热 传(火用) 传热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]