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单回路脉动热管传热性能的试验 预览 被引量:1

Experiment on heat transfer characteristics of single loop pulsating heat pipe
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摘要 通过对单回路紫铜-水脉动热管在风冷方式和定热流加热条件下,稳定运行时的传热性能的试验研究,得到管壁温度沿管长的变化规律,冷热段均温和温降(或温升)、传热温差、传热热阻随传热功率的变化特性.分析了充液率和管径对热管传热性能的影响.结果表明:冷热段均温、传热温差随传热功率的增加而增大,传热热阻随传热功率的增加而减小;小传热功率时,传热热阻对传热功率、管内径和充液率的变化较为敏感;减小充液率,增大管内径,增加传热功率可明显降低热管的传热热阻;较高传热功率时,充液率、管内径和传热功率对传热热阻的影响较小,影响传热热阻的主要因素是冷却热阻,可通过增加管外径或改善冷却条件来降低传热热阻,提高传热性能. The heat transfer characteristics of steady state for single loop red copper-water pulsating heat pipe were investigated under the conditions of air-cooling and constant heating power.The characteristics of wall temperature distribution along tube length,and the variety rules of condenser and evaporator temperature rise or drop,heat transfer temperature difference and heat transfer thermal resistance with heat input power were discussed.The effects of charging ratio and pipe diameter on heat transfer performance were also analyzed.The results show that the heat transfer temperature difference and the average tempe-rature of condenser and evaporator increase with the increasing of heat transfer power,while thermal resistance decreases.The effects of pipe diameter,charging ratio and heat power on thermal resistance are obvious for small heat input power.Reducing filling ratio or increasing internal diameter and heat power can reduce thermal resistance of heat pipe significantly.However,pipe diameter,charging ratio and heat power have slight effect on thermal resistance for high heat input power.The main factor of thermal resis-tance is cooling thermal resistance.Increasing external diameter or improving cooling condition may reduce the thermal resistance of heat pipe and improve heat transfer performance of heat pipe.
作者 苏磊 张红 丁雷江 丁锐 Su Lei,Zhang Hong,Ding Leijiang,Ding Rui(College of Energy,Nanjing University of Technology,Nanjing,Jiangsu 210009,China)
出处 《江苏大学学报:自然科学版》 EI CAS 北大核心 2012年第1期 49-54,共6页 Journal of Jiangsu University:Natural Science Edition
基金 江苏省教育厅自然科学基金资助项目(02KJB470001)
关键词 单回路脉动热管 充液率 管径 传热性能 传热热阻 single loop pulsating heat pipe charging ratio pipe diameter heat transfer performance heat transfer thermal resistance
作者简介 苏磊(1969-),女,山西娄烦人副教授(sulei69@sohu.com).主要从事高效传热传质设备研究. 张红(1963-),女,江苏南京人,教授,博士生导师(hzhang@njut.edu.on),主要从事汽液两相流和太阳能技术研究.
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