Methods for measuring the bubble size in bubble column bioreactors II

Summary Electrooptical and light scattering methods for measuring the structure of two phase flow, especially bubble size, are described and compared with photographic and electrical conductivity methods.Symbols L length - T time - M mass - d bubble diameter - mean bubble diameter - d_K inside diameter of the sensor capillary - 1 longitudinal distance between start and stop sensors - 1_B pierced length of bubble - t time - t₁ length of square-wave signal at start sensor - t₂ length of square-wave signal at stop sensor - 1₁₂ time delay between start and stop signals - V_B bubble volume - V_B bubble velocity - w_SG superficial gas velocity