Visual experiment on evolution of flow pattern of R124-DMAC bubble absorption process in vertical tube

Through constructing a visual experiment platform of bubble absorption heat and mass coupled transfer characteristics in the vertical tube, the flow pattern characteristic and distribution regularity of bubble absorption process on R124/DMAC (2-chloro-1, 1, 1, 2, -tetrafluoroethane / N', N'- dimethylacetamide) as working medium are studied. The result shows that the flow pattern characteristic and distribution regularity are influenced by the refrigerant vapor flow rate, absorption solution flow rate and its inlet temperature. Under large refrigerant vapor flow rate and high solution inlet temperature conditions, three kinds of flow patterns of churn flow, slug flow and bubble flow can be simultaneously observed in the bubble absorption tube. Under the condition which the vapor is completely absorbed in the absorption tube, the height of churn flow is no more than half of the total absorption height, while the height of slug flow is no more than 2/5 of the total absorption height. The rest of the absorbing height is occupied by bubble flow.