摘要
实验研究了润滑油对R410A在外径3、5 mm光管内流动冷凝摩擦压降的影响.研究表明,润滑油的存在减小了R410A在光管内的冷凝摩擦压降,R410A油-混合物的摩擦压降比纯R410A的摩擦压降最大下降了19%;润滑油降低冷凝摩擦压降的影响随着平均油浓度的增大而增大,而随着质流密度和干度的增大而减小.基于混合物性建立了适用于R410A-油混合物在小管径光管内流动冷凝的摩擦压降关联式,该关联式的预测值与实验值误差为-20%^+30%.
Influence of oil on flow condensation frictional pressure drop of R410A inside 5 mm and 3 mm O.D.horizontal smooth tubes was investigated experimentally.The research results show that the presence of oil always decreases the flow condensation frictional pressure drop of R410A inside smooth tubes,and the decrement can reach up to 19% at the present test conditions;the decrement increases with the increase of nominal oil concentration,and decreases with the increase of mass flux and vapor quality.A new correlation of frictional pressure drop for R410A-oil mixture flow condensation inside small diameter smooth tubes was developed based on the mixture properties,which agrees with all the experimental data within the deviation of-20% ～ ＋30%.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2010年第10期1362-1366,共5页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金(50906048)
中国博士后科学基金(20090460618)资助项目
关键词
R410A
润滑油
光管
冷凝
压降
关联式
R410A
lubricating oil
smooth tube
condensation
pressure drop
correlation
