Measurement of gas hold-up profiles in stirred tank reactors by gamma ray attenuation technique

Gas hold-up is one of the most important hydrodynamic characteristics that is needed for performance estimation, design and scale-up of reactors. The performance of large-scale reactors can be reliably evaluated by measuring the gas hold-up in such reactors. In the present work, local gas hold-up in an industrial reactor has been measured with the help of gamma ray tomogra phy. Based on these measurements, an empirical equation has been proposed f or the estimation of the gas hold-up distribution. The proposed equation ha s been validated by comparison with laboratory scale data.