振动参数对竖直管内R124/DMAC工质鼓泡吸收特性的影响

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.