The bubble pump theoretical model was correspondingly established based on drift flow model theory. The analysis was performed on the working characteristics of the bubble pump operating under adiabatic slug flow condition in Einstein refrigeration system. The experiment was conducted on the steady-state process of the bubble pump with saturated water as the working fluid. The bubble pump resistance loss coefficient was fitted with the theoretical calculation data and experimental data of bubble pump by the least square fitting. The theoretical model of bubble pump was corrected to acquire the new empirical correlation

which was verified in terms of credibility .The results show that the experimental result is in reasonable agreement with the theoretical calculation of correction values. The data error of resistance loss coefficient fitted is within 5.3% and the correction results have strong accuracy and feasibility

which perfect the theoretical model of bubble pump. The conclusion provides a theoretical guidance for the optimal design of the bubble pump

which also means a valuable reference for the further research of the bubble pump performance in Einstein refrigeration system.