PDA测试浮选柱液-气两相流中气泡的流速分布

Bubble Velocity Distribution in Liquid-Gas Two-Phase Flow of Flotation Column Using PDA Velocimeter

摘要: 采用PDA两相流测速技术,对LHJ浮选柱下导管内液一气两相流中气泡的流速进行了测定,获得了浮选柱内液气两相流中气泡沿径向和轴向的湍流速度分布规律.测试结果证实了LHJ浮选柱内形成泡沫流时,下导管内气泡运动处于强烈的脉动状态,该结果为揭示其矿化作用机理、建立数学模型及放大提供了理论依据.

Abstract: The bubble velocity was determined in liquid-gas two-phase flow of downflow pipe of LHJ column, using particle dynamics analyzer(PDA) velocimeter.Bubble turbulent velocity distribution on radial and axial direction in downcomer was got first time. It proved that the bubble motion is in violent purbulent pattern in the case of foam flow. The theoretical basis was established to reveal the mechanism of minerization, set up mathematical model and scale up coltnmn.