摘要
对R32在φ5mm和φ7mm的水平光管内的流动沸腾时,润滑油对换热与压降特性的影响进行了试验研究,试验的质量流量范围为100~500 kg/(m^2·s),润滑油的含量在0~5%之间。结果表明,沸腾换热系数随着质量流量的增大而增大。在低干度区,换热系数随干度的增大而增大,当干度达到0.7~0.8时,换热系数达到最大。随着润滑油含量的增大,局部换热系数在减小。压降随着管径的减小和质量流量的增大而增大。润滑油含量的增大,导致压降的增大。在5mm管内,润滑油含量对换热系数和压降影响比较明显。
Impact of lubricating oil on heat transfer and pressure drop characteristics of R32 boiling in φ5mm and φ7mm horizontal tube was studied by experiment. Range of mass flow was 100 ~ 500 kg /(m^2·s),and content of lubricating oil was from 0 to 5%. The results showed that heat transfer coefficient increased with mass flow increasing. Heat transfer coefficient increased with the dryness increasing at low zone. When the dryness reached 0.8,heat transfer started to deteriorate due to the influence of lubricating oil.Heat transfer coefficient decreased with lubricating oil increased. The pressure drop reduced with the flow rate and the pipe diameter increasing. As content of lubricating oil increased,the pressure drop also increased. In φ5mm tube,affect of the lubricating oil was relatively obvious for heat transfer coefficient and pressure drop.
出处
《流体机械》
CSCD
北大核心
2016年第3期65-69 37,共6页
Fluid Machinery
基金
国家质量监督检验检疫总局:质检公益性行业科研专项基金项目(201410047)
关键词
R32
润滑油
沸腾
换热系数
R32
lubricating oil
boiling
heat transfer coefficient
