Gas hold-up and power consumption for gas-liquid system agitated in a stirred tank equipped with vertical coil

The aim of the experimental study presented in the paper was to analyze the mixing process in a gas-liquid system mechanically agitated in a stirred tank of inner diameter D = 0.634 m equipped with a high-speed impeller and tubular vertical coil (tubular baffles). The regimes of the dispersion of gas bubbles in the liquid, gas hold-up, and power consumption characteristics were determined for varying stirrer speeds and gas flow rates. The results of the measurements were described by an empirical equation using dimensionless quantities.