来源：塑料托盘 发布时间：2010年7月17日
塑料托盘首先总结了不同类型熔窑中玻璃液流动特征的演变规律；大型玻璃熔窑，温差对流强度很大，满足熔制要求；中小型熔窑，温差对流强度减弱，但仍可满足要求，若辅以强制对流可明显改善产品质量；对小型单元窑，温差对流很弱塑料托盘，不能满足要求，鼓泡是其必须的熔制措施。其次确定了玻璃液中鼓泡时气泡跃离直径主要取决浮升力、粘性力及惯性力平衡的概念，建立了连续鼓泡系统的数学描述，计算结果与实际较为接近。论文进而通过物理模拟揭示了气泡串上升诱导玻璃液的流动结构，借助数值模拟确定了塑料托盘该流动结构的主要成因，指出了一般玻璃液流数学模型在自由液面处理方法上的误差。最后，建立了单元窑上独特的玻璃液流特征描述，窑内流动形塑料托盘态主要由鼓泡诱导流场所控制，温度场对流场的影响较弱；鼓泡串诱导的流动形态提供了鼓泡幕设计的依据。【Abstract】 In this paper analytical and experimental results obtained have been divided into four aspects. Firstly, the strength of the buoyancy induced melt flow varies greatly with furnace scale and glass types. For furnaces of large scale production, the natural convection is strong enough to satisfy the need of the melting and refining. For furnaces of middle or small scale production, though the natural convection is obviously reduced, it still meets the requirement of the glass technology. For unit melter, the melt flow is too weak. The bubbling is hence a necessary measure to produce the forced convection for melting in the unit melter. Secondly, based on simulation of physical model, the bubble forming process at nozzle exit is discussed and its analytical expression is advanced, which indicate that bubble size depends on the balance of buoyancy, viscosity and inertia forces. A mathematical model for continuous bubbling system is established to predict the bubble size, which agrees well with the experimental data. Thirdly, the special attention has been paid to study bubbling induced flow pattern. Unlike the conventional flow pattern predicted by numerical simulation, the experimental show that its core section looks like that of an onion with two wings. This is because one usually employs the free tangential slide with rigid lid as the boundary condition for melt surface in computation. Based on the free surface condition the numerical results on the bubbling induced flow pattern are consistent with that observed in physical model system. At last, the flow pattern in unit melter has been described and discussed. The flow process in the melter is controlled by bubbling induced flow behavior while the temperature field shows minor effect. The distance between two rows of bubblers may be optimized according to the bubbling induced flow patterns