Dispersion coefficients of liquid were measured in a bubble column packed with screen cylinders. Impulse response technique was applied to measure the dispersion coefficient as a function of the gas and liquid flow rates and the liquid viscosity. The axial dispersion coefficient was found to increase with increasing gas and liquid velocities and with decreasing liquid viscosity within the range of experimental conditions. The relationship could be expressed by the following correlation :
D = 24.4U_l^0.81U_g^0.26μ^-0.30