摘要
为配合车载余热吸收式制冷系统新型工质的研发,设计建立了一套振动状态下可视化竖直管内工质鼓泡吸收特性实验台,研究了R124(一氯四氟乙烷)/DMAC(二甲基乙酰胺)工质鼓泡吸收过程流型演化特性,探索了吸收高度与振动参数(振幅和频率)之间的联系.结果表明:相对于静止状态,振动状态下鼓泡管内的两相流流型更为复杂,致使吸收高度的标准差增加,而且振动会使制冷剂气泡分布的均匀性变差,导致吸收过程中气泡间的融合更加频繁;在一定范围内,振动频率和振动幅度的增加均会使吸收高度呈现增加趋势,但当振动频率为25,Hz时,会在振幅适中(≤0.47,mm时)情况下,产生降低吸收高度的效果.
As a part of the project of developing new working fluids for the absorption refrigeration system driven by the exhausting heat of vehicle engine,a vibratile experimental rig was newly built to test the bubble absorption characteristics of working fluids in a visual vertical tube.R124(2-chloro-1,1,1,2-tetrafluoroethane)/DMAC(N',N'-dimethylacetamide)taken as the working fluids,the two-phase flow pattern evolvement characteristic and the relationship between absorption height and vibration parameters(amplitude and frequency)were studied in the bubble absorption process.The results show that the two-phase flow patterns of working fluids R124/DMAC in vibration state become more complicated compared with those in normal stationary state,leading to an increase of the standard deviation of absorption height.Besides,the distributional homogeneity of the gaseous refrigerant bubbles becomes worse,thus leading to the quantitative increase of colliding and merging of bubbles.With the increase of the vibration amplitude and frequency of the system within a certain range,the absorption height shows an upward trend.When the frequency is 25,Hz and the amplitude is smaller than 0.47,mm,the bubble absorption heights can be reduced.
作者
吴曦
刘嘉威
蒋孟男
徐士鸣
王伟
Wu Xi;Liu Jiawei;Jiang Mengnan;Xu Shiming;Wang Wei(Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CSCD
北大核心
2018年第10期1050-1055,共6页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目(51606024)
中国博士后科学基金资助项目(2016M591427)
中央高校基本科研业务费项目(DUT17JC31)~~
关键词
制冷剂
吸收剂
两相流
气泡
吸收
振动
refrigerant
absorbent
two phase flow
bubble
absorption
vibration
