FLOW CHARACTERISTICS OF GAS-LIQUID-PARTICLE MIXING IN A GAS-STIRRED LADLE SYSTEM WITH THROUGHFLOW

An experimental study is performed on air-liquid-particle mixing, resu lting from an air-particle mixture injected into a liquid flowing thro ugh a slender ladle. Flow visualization combined with image processing is employed to investigate the bubble and particle behavior at the no zzle outlet. Effort is directed to particle discrimination in both the liquid and the bubbles to determine particle distribution, which affe cts the mixing performance of gas bubbles, solid particles and liquid. A real-time movement of bubble and particle behavior can be visualize d by means of image processing with the use of a slow-motion video rec ording. It is disclosed that the particles injected through the nozzle may stick on the inner surface of the gas bubble, break through the b ubble surface, or mingle with the gas stream to form a two-phase jet, depending on the particle-to-gas mass flow rate ratio. It is observed that when a solid-gas two-phase jet penetrates deeper in the horizonta l direction, the particles and bubbles rise along the vertical sidewal l and simultaneously spread in the transverse direction, thus promotin g a better liquid-particle mixing. The application of the slow-motion video recording results in quantitative evaluations of both the penetr ation depth of particles or of gas-particles from the injection nozzle and the velocity distribution along the sidewall.