液滴间距对均匀金属液滴流温度场影响的研究

Effect of Droplet Spacing on Temperature Field of Uniform Metal Droplet Stream

针对均匀金属液滴喷射成形过程中的液滴流,建立了均匀液滴流的有限元模型。通过该模型考察了液滴间距对液滴流中各个液滴温度场的影响,并讨论了液滴流的传热系数和冷却速率。结果表明,当液滴间距与液滴直径比为2.8、5.6、8.4、11.1、13.9时,液滴的冷却速率、传热系数均远低于单个液滴,液滴间距对冷却过程的影响较大。随着液滴间距增大,液滴之间的相互影响减小。

A finite clement model for uniform metal droplet stream was developed. With the model, the effects of droplet spacing on the temperature field of the droplet were analyzed, and the convective heat transfer coefficient and cooling rate of the droplet were included. The calculation results show that the cooling rate and heat transfer coefficient of the droplets in the stream arc evidently lower than those of an isolated droplet when the ratio of droplet spacing and droplet diameter is 2.8, 5.6, R 4 11 1 and 13.9 resnectively. With the dronlet snacing increasing, the interaction between molten dronlets decreases.