摘要
为研究纳米颗粒对制冷剂整体性能的影响,设计了一套可视化实验装置,对纯制冷剂（氟里昂R11）和纳米Cu/R11为工质的泡核沸腾现象进行了可视化对比研究.通过摄像技术观察了工质沸腾汽化过程,以及在泡核沸腾过程中的生长与跃升过程.实验结果表明,纳米Cu颗粒的添加强化了R11制冷剂的传热性能,纳米质量浓度（0.05%-1%）及冷-热源温差（15℃-30℃）越大,工质的传热性能越强,且验证了纳米Cu/R11在小温差下强化传热的特性更为显著,为今后热虹吸管蒸发段流动与传热机理研究提供参考.
In order to study the effect of nano-particles on the whole performance of the refrigerants,a set of observable experimental equipments are designed to conduct a visual comparative research into the nucleate boiling phenomena with freon（R11）and nano Cu-R11 as working fluid. Using the camera technology,the process of boiling and vaporization of the working fluid,as well as the growth and zooming process of the nucleate boiling are clearly observed. As the experimental result shows,the heat transfer performance of R11 is enhanced by the addition of Nano-Cu particles.Otherwise,the heat transfer performance of the working fluid can be strengthened as the addition concentration of nano（0.05%-1%）and the temperature difference between hot and cold source（15 ℃-30 ℃）become larger. Meanwhile,the research studies verify the fact that the character of heat transfer enhancement of Nano-Cu/R11 becomes more significant in smaller temperature difference conditions,which provides a reference to the subsequent experimental study on the flow of the evaporator section of thermosyphon and heat-transfer mechanism.
出处
《南京师范大学学报（工程技术版）》
CAS
2016年第2期60-65,共6页
Journal of Nanjing Normal University(Engineering and Technology Edition)
基金
江苏省科技计划项目(BY2014001-04)
关键词
纳米流体
蒸发
泡核沸腾
纳米质量浓度
气泡
温差
汽化
nano-particles
evaporation
nucleate boiling
nano concentration
bubble
temperature difference
vaporization
