【作者】 刘红； 解茂昭； 尹洪超； 王德庆；

【Author】 LIU Hong1, XIE Mao-zhao1,YIN Hong-chao1 , WANG De-qing2 (1. School of Energy and Power, Dalian University of Technology, Dalian 116024, China; 2. School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116024, China)

【机构】 大连理工大学能源与动力学院； 大连交通大学材料科学与工程学院；

【摘要】 应用水模拟实验和数值模拟方法分析泡沫铝制备过程气泡的生成尺寸。水模拟以相似原理为基础,应用聚乙烯醇水溶液中通入空气产生气泡模拟泡沫铝的发泡过程。数值模拟应用VOF方法追踪气液两相界面,过程假定气体流量为常数,不计压力变化的影响,应用气泡脱离时间计算生成气泡直径。将数值模拟得到的气泡脱离直径计算结果与水模拟实验结果进行对比,其结果基本一致。此外还应用数值方法考查操作条件及液体物性对气泡脱离尺寸的影响,结果发现接触角影响最大,其它的如孔径、气体流量、表面张力的影响也较大。而液体密度的影响则不大。水模拟实验和数值模拟技术为泡沫铝发泡过程分析提供了有利的基础。更多还原

【Abstract】 Bubble formation size at an orifice immerged in liquid is investigated by numerical simulation assuming a constant gas flow rate. The Volume-of fluid (VOF) method was applied to research the formation process in axisymmetric coordinates. A water analogy experiment was conducted on the bubble formation in a polyvinyl alcohol solution. The predicted bubble detach diameters are in good agreement with the experimental date. Factors affecting bubble detach diameters was studied using numerical simulation. Results show that the bubble diameter increases with orifice diameter, air flow rate, surface tension and solution viscosity, and decreases with contact angle. The effect of last one is most important among all the facors.更多还原