CAJ | 학술논문

针对转盘离心粒化工艺，以水为工质开展可视化实验。采用高速摄影仪对液膜波动、液丝断裂等粒化过程进行了捕捉，并利用 MATLAB 自编程序对获得的图像进行了处理。分析了离心粒化过程中液丝形成过程以及液丝断裂形成液滴的过程。研究了运行工况对液丝、液滴形成机制的影响。讨论了液丝形成对液滴形成的影响并获得了Weber数、Reynolds数对粒化效果的影响程度。结果表明，表面不稳定波是形成液丝的主要因素，且液丝在Rayleigh 不稳定性的作用下断裂形成液滴。升高转速或者减小流量有利于获得均匀的小液滴。Weber 数对液丝、液滴形成具有显著影响；Reynolds数仅对液丝数目有显著影响。
침대전반리심립화공예，이수위공질개전가시화실험。채용고속섭영의대액막파동、액사단렬등립화과정진행료포착，병이용 MATLAB 자편정서대획득적도상진행료처리。분석료리심립화과정중액사형성과정이급액사단렬형성액적적과정。연구료운행공황대액사、액적형성궤제적영향。토론료액사형성대액적형성적영향병획득료Weber수、Reynolds수대립화효과적영향정도。결과표명，표면불은정파시형성액사적주요인소，차액사재Rayleigh 불은정성적작용하단렬형성액적。승고전속혹자감소류량유리우획득균균적소액적。Weber 수대액사、액적형성구유현저영향；Reynolds수부대액사수목유현저영향。
Aiming at the granulation of molten blast furnace slag by spinning disc, the visualization granulation experiment was conducted using water as the substance. The granulation process including film waving and ligament break-up was captured by high-speed camera. A self-compiled MATLAB program was employed to extract the data from the images. The ligament formation and the process of ligament break-up into droplets during centrifugal granulation were analyzed. Variation of ligament formation and droplet formation with operating conditions was investigated. The qualitative relationship between ligament formation and droplet formation was obtained. The impacts of Weber and Reynolds numbers on ligament number, ligament break-up length, droplets diameter distribution and average diameter were discussed. The results revealed that the ligaments were originated from surface instable waves of liquid film on the spinning disc and the droplets were formed by ligament break-up due to symmetric shocking waves spreading from the ends to the middle of ligament. The number of ligament increased with increasing rotary speed and the distribution of droplets became more highly concentrated as well, while the break-up length of ligaments and the average diameter of droplets were decreased as rotary speed increased. With increasing liquid flow rate, the number of ligaments increased, while the distribution of droplets became less concentrated. The break-up length of ligaments and average diameter were increased with higher liquid flow rate. Besides, larger ligament number or shorter ligament break-up length resulted in smaller droplets. Meanwhile, both of the Weber and Reynolds numbers had significant influence on the ligament formation, while only the Weber number had significant effect on droplet formation. By fitting the experimental data, correlations have been obtained to predict the granulation variation with different operational conditions quantitatively.