Sequential Production of Solid Spherical Shells by Thermo-fluid Flow Controll

利用液-液-气系统中液体壳的连续生产装置，研究了毫米级实心球壳的批量生产。生产装置由装有两种不相容液体的圆柱形容器和底部中心的注气喷嘴组成。通过控制通过喷嘴的气体流量和选择具有合适性质的液体，在两个不相容的液体之间的水平界面上顺序地产生液壳。固体球壳是通过对周围液体的温度控制，使液体壳在浮力的作用下向上移动而固化而成的。详细研究了液壳的基本流型、周围液体的自然对流、传热传质特性、变形行为和界面振荡。这些研究是使用超级计算机进行数值计算的。特别是首次研究了以较大速度运动的液体壳体周围的流态。通过与实验数据的对比，验证了数值分析的有效性。从而明确了生产装置适宜的热流条件。阐明了合适的生产设备热流条件可提高生产频率。通过获得的实际数据，提高了生产频率。虽然前值小于10，但最大生产频率为20次左右。本文的研究成果发表在流体科学的著名期刊上，受到了相当大的关注。

The mass production of mm-sized solid spherical shells is studied using the sequential production device of liquid shells in liquid-liquid-gas systems. The production device comprises of the cylindrical vessel containing the two immiscible liquids and the gas injection nozzle at the center of the bottom. By controlling the gas flow rate through the nozzle and by selecting the liquids with suitable properties, the liquid shells are sequentially produced at the horizontal interface between the two immiscible liquids. The solid spherical shells are produced by solidifying the liquid shells, which move upward because of the buoyancy force, by the temperature control of the surrounding liquid. The basic flow patterns of the liquid shell, the natural convection of the surrounding liquid, the heat-mass transfer characteristics, the deformation behavior and the interface oscillation are studied in detail. These studies are made numerically using a super computer. Particularly, it is the first time to investiate the flow patterns around the liquid shells moving at relatively large velocity. Furthermore, the validity of the numerical analysis is confirmed by comparison with the experimental data. Consequently, the suitable thermalflow conditions of production device are clarified. The production frequency increases by the suitable thermal-flow conditions of production device are clarified. The production frequency increases by the obtained practical data. The maximum production frequency is about 20 although the previous value is less than 10.The results obtained here are published in the famous journals in fluid science, and receive the considerable attentions.