(1. 華東理工大學(xué) 無機(jī)材料系， 上海 200237;
2. School of Mechanical and Materials Engineering, University of Surrey, Guildford Surrey GU2 7XH, UK)
摘 要: 建立了旋轉(zhuǎn)盤離心霧化熔滴飛行與凝固進(jìn)程的一個(gè)數(shù)學(xué)模型, 并用Runge-Kutta方法進(jìn)行數(shù)值求解， 模擬鎳金屬熔滴飛行與凝固的基本情況， 探討過程和材料參數(shù)的影響。 結(jié)果表明： 在旋轉(zhuǎn)盤離心霧化中熔滴經(jīng)歷了一個(gè)大的過冷， 其過冷度約為0.2Tm; 在整個(gè)飛行期間， 熔滴的冷卻速率并不是常數(shù)， 在熔點(diǎn)附近冷卻速率約為5×104 K/s; 角速度越大， 冷卻速率越大， 熔滴開始和完成凝固所需時(shí)間越短， 霧化室可小些； 熔滴過熱溫度對(duì)熔滴過冷度和冷卻速率影響不明顯， 但完成凝固所飛行的距離增大， 從霧化室設(shè)計(jì)角度， 不宜采用大的過熱溫度。
關(guān)鍵字: 離心霧化； 旋轉(zhuǎn)盤； 飛行與凝固； 數(shù)學(xué)模型
（ 1. Department of Inorganic Materials, East China University of Science and Technology, Shanghai 200237, China;
2. School of Mechanical and Materials Engineering, University of Surrey, Guildford Surrey GU2 7XH, UK）
Abstract: A mathematical model of droplet dynamic and solidification progress during rotating disk centrifugal atomization was developed and numerically solved by Runge-Kutta's method. The flight and solidification of a nickel droplet was simulated. The effect of process and materials parameters was studied. The results show that the droplet experiences a large undercooling of about 0.2Tm and the cooling rate is not constant during the flight, about 5×104 K/s at the melting point. With increasing disk speed the cooling rate increases, and this leads an early start and completion of solidification. A small atomizing chamber can be used. The droplet superheat has a weak effect on nucleation temperature and cooling rate, but the flight distance at f=1 increases. Therefore, a high droplet superheat is not suitable for the design of atomizing chamber.
Key words: centrifugal atomization; rotating disk; flight and solidification; mathematical model
