摘要
为了研究金属沉积成形中流固耦合过程工艺参数,建立了VOF理论模型,利用该模型对整个熔滴沉积流固耦合过程进行数值模拟.通过变换相关参数,分析了熔滴滴落及在基板壁面上的铺展状态,研究了不同熔滴直径、碰撞速度以及基板温度对变形过程的影响.结果表明:熔滴在滴落过程中,温度由外层向内部逐渐降低,凝固层加大,而熔滴内部中心处温度基本不变;撞击基板后,熔滴沿着半径向外扩散,水平半径逐渐增大,高度逐渐减小;不同的基板温度所对应熔滴的凝固时间不同,而基板温度越低,熔滴凝固越快;不同直径的液滴在撞击经过预热的基板后,因金属熔滴凝固,体积分数随沉积时间延长而减小,但对铺展时间有影响.
To investigate the solid coupling process parameters of metal deposition,the VOF theory model was established to analyze the fluid-solid coupling deformation process for the whole droplet deposition.By changing related parameters,the fall and the spread out of molten droplets on the substrate surface were analyzed to discuss the effects of droplet diameter,impacting velocity and substrate temperature on the deformation process. The results show that in the dripping process of droplets,the temperature is gradually reduced from outer to inner,and the solidified layer is increased with basically unchanged internal center temperature. After hitting substrate,the molten droplets spread along the radius with gradually increased horizontal radius and decreased height. For different substrate temperature,the corresponding drop coagulation times are different. The lower the substrate temperature is,the faster the droplet solidification is. After impacting the preheated substrate,due to the metal droplet solidification,the volume fraction of droplets is decreased with the increasing of deposition time,but it has no effect on spreading time.
出处
《江苏大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第5期588-592,597,共6页
Journal of Jiangsu University：Natural Science Edition
基金
陕西国防工业职业技术学院科研计划项目(Gfy15-09)
关键词
金属熔滴
流固耦合
碰撞
铺展
工艺参数
metal molten drop
fluid-solid coupling
collision
spread out
process parameter
