雾化过程气体与金属雾滴的三维流动模型

MODELLING OF THREE-DIMENSIONAL FLOW OF ATOMIZING GAS AND DROPLETS IN ATOMIZATION PROCESS

气体雾化沉积技术是一种生产大块快速凝固材料的新型工艺．雾化过程气流与金属雾滴之间的质量、动量和能量传输对沉积材料的组织和性能具有重要影响．本文根据质量、动量和能量守恒等基本理论对金属雾化过程气流与雾滴之间的相互作用进行了研究，建立了气体－雾滴三维流动的数学模型．推导出雾化过程两相流体流动的基本控制方程组．

Gas-atomized spray deposition(SD) process is used for the manufacture of rapidly solidified bulk and near-net-shape preforms. The mass, momentum and energy transfers of the gas and the atomized droplets during atomization have great influence on the microstructures and properties of the deposit. The flow behaviour of the gas and the droplets are studied based on the mass, momentum and energy conservation theory. The mathematical model of the three-dimensional flow of the gas and droplets is proposed, and the controlling equations of the flow are deduced.