一、管内充分发展区的层流流动 2.流动和换热的入口段及充分发展段 Hydraulic and Thermal Entry Length and Fully Developed Region Hvdraulicallv Fullv Developed Flow Hvdraulic Entrv Lenath Thermally Fully Developed Flow Thermal Entry Length 一、管内充分发展区的层流流动 2. 流动和换热的入口段及充分发展段