【摘要】 以静态条件下闭孔泡沫铝的空气发泡过程为研究对象,在聚乙烯醇水溶液中进行模拟研究.通过改变入射压缩空气的流量、压力,液体的粘度,出气孔的直径、数量、出气孔表面距液体表面的距离等实验条件,建立静态条件下液体表面气泡直径的预测模型,以便对铝熔体的泡沫特性和闭孔泡沫铝的胞直径进行科学有效的控制.在静态水模拟实验条件下获得了液体表面气泡直径预测模型.当入射空气的压强、气流量,液面高度,出气孔直径增大时,气泡直径随之增大;当出气孔数量,液体粘度增大时,气泡直径减小,表面张力对气泡直径的影响可以忽略不计;静态条件下液体表面气泡直径的预测值和实验测量值符合得较好,相对误差分布在-5.04%~6.32%之间.更多还原

【Abstract】 A simulation of static bubble formation process was conducted in a polyvinyl alcohol solution to predict foam size of a closed cell aluminum foam produced by air-foaming aluminum melt with varied the factors of affecting bubble diameter,viscosities,air flow,air pressure,orific and number diameter and depth of the polyvinyl alcohol solution.A numerical model was established to predict the bubble diameter in static foaming condition.The bubble diameter increases with air flow rate,air pressure,orifice diameter and the solution depth,and decreases with the orifices number and liquid viscosity.Moreover,the resulted prediction model of foam size of the closed cell aluminum foam was verified by comparison to the experimental results from the foaming process at different foaming conditions,and the predicted bubble diameter is in good agreement with the experimental ones,the relative error distributes between-5.04 %and 6.32 %.更多还原