An experimental study of phase distribution and turbulence structure for solid/liquid flow in a horizontal pipe

Local measurements of the velocity and phase distribution were made for sol id/liquid two-phase flows in a horizontal pipe using a multidimensional las er Doppler anemometer (LDA) system. The pipe used had a 30.6 mm inner diame ter and was made of a special optically clear material, Fluorinated Ethylen e Propylene (FEP), which has the same index of refraction as water. The tes t section and laser probes were submerged in water so that no optical corre ctions were necessary. Simultaneous measurements of the liquid and particle phases were obtained and discriminated based on differences in the residen ce time that each particle had when crossing the LDA's measurement volume. Positive buoyant and negative buoyant solid spherical particles, about 2 mm in diameter, were used in this study. A complete data set of the phasic me an velocities, turbulence and volume fractions were taken for each particle type. The results presented herein are complete and self-consistent. and can be u sed to assess the predictive capabilities of multidimensional two-fluid com putational fluid dynamic (CFD) models.