熔融聚合物中气泡的运动分析与实验研究

The Movement Analyze and Experimental Observation of Bubble Entering the Melt Polymer Field

文中求出了CO2气泡注入到熔融聚合物流场后的计算模型,利用熔体流变学理论与两相流理论对气泡的头部、尾部、速度进行分析,计算了气泡在聚合物熔体中的速度表达。结果表明,其头部速度Un,尾部速度Ut等不仅与熔体的性质、流场条件有关,同时还与此气泡在流道中位置、气泡内的压力变化等诸多因素有关。为此引入综合系数C以修正上述理论计算模型,通过一系列实验,得出影响CO2在熔融聚合物中运动的综合系数C,利用其对上述理论运动模型加以有效的实验修正,进一步得到符合实际的气泡在熔融聚合物流场中运动计算模型。

Found the movement model of bubble when they enter the melt polymer field, and analyzed in theory. It is found that the head rate Uh and the bubble tail rate Ut of bubble for the different experiment conditions is ehanged greatly. So introduce the synthesis coefficient C to show the influence of the movement of the bubble unde： the melt polymer field, a series of experiments were carry out to obsere the bubble movement under the polymer melts flow field using the visual flow-field. It is found that the synthesis coefficient C is different when changing the experiment conditions and when the temperature and rotation are not be changed the C is go to a fixed value. It is very importance to get the synthesis coefficient C, then the right calculating model got and the new material studied.