摘要
采用数值模拟描述气泡在铝熔体中的形成过程，并结合水模拟和铝熔体发泡实验，研究了不同空气参数及聚乙烯醇水溶液物性对浸没孔中气泡形成尺寸的影响．研究结果表明，当单个出气孔的入射空气流量（0．156～0．468L/min）与出气孔直径（0．2～0．3mm）增大时，气泡尺寸从2．41mm增大到3．2mm；当出气头的锥角（0°～45°）和熔体黏度（3．57～10．25mPa·s）增大时，气泡尺寸从2．38mm减小到3．29mm．另外，随着气泡长大，出气口处气液界面的接触角逐渐减小；出气头锥角越大，生成的气泡脱离时间越早．数值模拟获得的气泡尺寸与水模拟和铝熔体发泡实验得到的结果基本一致．
Numerical simulation to describe aluminum melt bubble formation process combined with water simulation and aluminum melt foaming were carried out to study the effect of air flow and liquid property on bubble formation at submerged orifices. The results show that the bubble size increases from 2.41 to 3.2 mm with increasing airflow rate from 0. 156 to 0. 468 L/min and increasing orifice diameter from 0.2 to 0.3 mm. The bubble size decreases from 2.38 to 3.29 mm with increasing orifice taper angle from 0° to 45°, and increasing the liquid viscosity from 3.57 to 10.25 mPa · s. Moreover, the contact angle of the air-liquid inter-phase decreases with bubble growth, and the bigger the orifice taper angle is the earlier the bubble will detach from the orifice. Numerical simulation values of the bubble size are in agreement with the results of water simulation and aluminum melt foaming experiment.
出处
《大连交通大学学报》
CAS
2009年第3期60-65,共6页
Journal of Dalian Jiaotong University
关键词
气泡生成
泡沫铝
数值模拟
bubble formation
aluminum foam
numerical simulation
