Similar physical simulation of microflow in micro-channel by centrifugal casting process  

离心铸造下微尺度充型流动的相似物理模拟(英文)

作　　者：任明星[1] 王国田[2] 李邦盛[1,2] 王振龙[3] 傅恒志[2] 

机构地区：[1]哈尔滨工业大学微系统与微结构制造教育部重点实验室,哈尔滨150001 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001 [3]哈尔滨工业大学机电工程学院,哈尔滨150001

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第4期1094-1100,共7页中国有色金属学报（英文版）

基　　金：Project (51005053) supported by the National Science Foundation for Young Scientists of China

摘　　要：By means of similar physical simulation, liquid metal filling flow pattern in the microscale during the centrifugal casting process was studied. It was found that, in microscale, the flow channel with the maximum cross-sectional area was filled first, and the micro flow channels with 0.1 mm in diameter were filled when the rotational speed was increased to 964 r/min. The total fluid energy remained constant during the mould filling, and the changes of cross-sectional area only occurred in the microflow channels with 0.3 mm in diameter. Filling velocity increased with processing time, and a peak value was achieved rapidly, followed by a gentle increase as the process proceeded further. The time required to achieve the peak filling rate decreased dramatically with increase of rotational speed.利用获得的相似准则,采用相似物理模拟方法,研究离心铸造过程中液态金属在微尺度空间内的充型流动规律。结果表明:在微尺度条件下,模拟流体优先充填横截面积最大的流道,当转速提高到964 r/min时,才会同时充填0.1 mm的微流道;在充型流动过程中,流体总能量保持不变,流体的自由液面是以转轴为圆心的规则圆弧面;充型速度随时间的增加而增大,迅速达到一个极值,然后随着时间的增加,变化逐渐趋于平缓,同时随着转速的增加充型速度达到峰值的时间也会极剧缩短。

关 键 词：similar simulation MICROFLOW centrifugal casting MICRO-CHANNEL 

分 类 号：TG249.4[金属学及工艺—铸造]