Abstract: The changing rules of gas holdup, Sauter mean diameter (SMD) of bubbles, slip velocity between gas and liquid phases of nitrogen-kerosene system in a cold bubble column with a diameter of 45 mm were investigated. The experimental results show that in the bubble coalescence control region, the average gas holdup increases as the velocity of the gas and liquid phase increases, the SMD of bubbles increases with increasing the gas velocity, but decreases with the increased liquid velocity. Under the same conditions, compared with the results in smaller column, larger reactor has the stronger bubble coalescence effect and larger bubble diameter, while the gas holdup is reduced.

Key words: bubble column, hydrodynamics, SMD of bubbles, gas holdup