液滴法制备空心玻璃微球的模拟计算

 通过对液滴法制备空心玻璃微球的成球过程进行分析,建立了成球过程数学模型,定量描述了液滴的形成、液滴的封装、凝胶球壳的形成与干燥,发泡剂的分解,球壳的预热与熔炼、冷却与收集等过程中,液滴/球壳的大小、速率、壁厚、气压等随操作条件的变化,计算了抽气速率、发泡剂浓度、玻璃溶液浓度和初始液滴大小等的改变对成球过程的影响,并进行了初步验证实验。

Mathematical simulation of the physical process to fabricate hollow glass micros pheres liquid droplet method

The physical process to fabricate hollow glass microspheres(HGM) by the Liquid Droplet Method in a 7-meter-high multi-zone high temperature furnace has been modeled mathematically. And the model quantitatively describes the whole process, through which the main parameters of the droplets/membrane spheres/HGM including the velocity, the sizes, the glass-forming oxide mass, the wall-thicknesses, and the inner gas pressures of vapor and air inside can be calculated. Calculation has been done under a series of operation conditions, especially at different purge gas rates, initial concentrations of the blowing agent and those of glass-forming oxides in the glass-forming solutions, and sizes of the initial droplets. The calculated results are to some degree in good agreement with the experiments carried out under the same conditions as the calculation. It is proved that the model can help technicians to select the operation conditions to fabricate HGM in different scales of diameters and wall-thicknesses.