Estimation of light intensity profilesin an annular type photoreactor withgas-solid-in-liquid dispersions

Light intensity profiles in an annular photoreactor with gas-solid-in-liqui d dispersions are measured by means of a newly designed photo-probe which s hows a uniform sensitivity to scattered light rays from any directions. The light scattering intensity profiles are approximated by a modified equatio n which includes two model parameters as a weight coefficient and an effect ive attenuation coefficient in the light intensity profile equation based o n a diffused line light source model for an annular photoreactor with a hom ogeneous phase. The functional relations between the two parameters, and ga s-holdup and solid particles concentration are determined to satisfy the me asured profiles. The modified equation can estimate the light absorption ra te due to the dispersed solid particles in the reactor. The rate shows a ma ximum value for the optimum solid concentration with a certain gas hold-up.