自然对流下蒸汽凝结表面传热系数测定实验装置研制  

Development of experimental apparatus for measuring heat transfer coefficient of steam condensation surface under natural convection

作　　者：幸文婷[1] 朱赤[1] 叶晓明[1] 吴杰俊 XING Wenting;ZHU Chi;YE Xiaoming;WU Jiejun(Experimental Teaching Center of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学能源与动力工程实验教学中心,湖北武汉430074

出　　处：《实验技术与管理》2024年第6期172-176,共5页Experimental Technology and Management

基　　金：华中科技大学实验技术研究项目(HZKJSYJSXM2024M071)。

摘　　要：自然对流下蒸汽凝结表面传热系数测定实验是将蒸汽通过一组表面状态各不相同的管道,测定管道在大空间空气介质中自然冷却过程中的蒸汽凝结表面传热系数。由于管道的材质、几何形状、接触方式及管外空气流动状况都会不同程度地影响换热效果,因此测定每根管道的表面传热系数值,可条理性和系统性地分析影响传热过程的各因素。该文设计了自然对流下蒸汽凝结表面传热系数测定实验装置,可开展管道材质、肋片结构、管道横截面几何形状、管道保温材料对传热系数的影响实验研究。应用实践表明,实验项目内容全面,提高了学生的课堂积极性,具有良好的教学效果。[Objective]The surface heat-transfer coefficient represents the heat transfer per unit time per unit heat transfer area under a unit temperature difference,which can be used to measure the difference in the performance of various convective heat transfer processes.Measurement of the surface heat transfer co-efficient is crucial.Several experimental devices for measuring the heat transfer coefficients of steam condensation surfaces under natural convection have been developed for undergraduate experimental teaching to enable students to systematically study the main factors affecting the heat transfer process and master the essence of the convective heat transfer process.[Methods]To determine the heat transfer coefficient of the steam condensation surface under natural convection,water vapor was passed through a set of pipes with different surface states.The pipe was cooled naturally over a large space.As the material,geometry,contact mode,and airflow outside the pipe affect the heat transfer effect to different degrees,the factors affecting the heat transfer process can be methodically and systematically analyzed by measuring the heat transfer coefficient of each pipe.This experiment is a required part of the engineering heat transfer experiment course.The contents of this course include experimental research on the influence of pipe material on the heat transfer coefficient,experimental research on the influence of different finned structures on the heat transfer coefficient,experimental research on the influence of pipe cross-section geometry on the heat transfer coefficient,and experimental research on the influence of pipe insulation material on the heat transfer coefficient.[Results]The following results were obtained from the experimental data.①Under the condition that the steam flow rate,geometry,diameter,wall thickness,and length of the heat exchange tube are the same,the comprehensive heat transfer performance of each heat exchange pipe with different materials is ordered from highest to lowest:copper

关 键 词：蒸汽凝结 表面传热系数 实验项目 教学效果 

分 类 号：G642.423[文化科学—高等教育学] TK124[文化科学—教育学]