Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

Static mixers are attractive alternatives to conventional gas-liquid contactors, widely used for mixing and heat transfer between two fluids in various process applications. Knowledge on the limits of number and gemoetry of the static mixer elements is important for optimization for the desired mixing purpose. The present work is designed to investigate the performance of static mixers in upward gas-liquid (air - water) flows. The experiments are carried out in a tube (DT = 0.08 m) packed with helical static mixer (length 80 mm/ diameter 80 mm) using ultrafast electron beam X-ray tomography. The effect of number of static mixer element (3 - 9), liquid velocity (UL = 0.02 & 0.6 m/s), gas velocity (0.15 ≤ UG ≤ 0.6 m/s) on hydrodynamic parameters like gas holdup, bubble size distribution, etc. and pressure drop across the static mixer will be presented and conclusions will be drawn for a proper mixer selection.