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首页> 外文期刊>International Polymer Processing: The Journal of the Polymer Processing Society >Experimental Investigation of the Effect of the Bubble Cone on the Cooling Jets used in the Blown Film Manufacturing Process
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Experimental Investigation of the Effect of the Bubble Cone on the Cooling Jets used in the Blown Film Manufacturing Process

机译：气泡锥对吹膜生产过程中冷却喷嘴影响的实验研究

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摘要

An experimental investigation was performed to characterize the flow field produced by a dual-lip air ring used in the blown-film manufacturing process for a solid model with a blow-up ratio of 3.5 similar to the shape of a typical LLDPE bubble.Distributions of the static and fluctuating pressure on the model and the flow field above the forming cone were measured for a range of settings on the dual-lip air ring.It was found that the distribution of the pressure on the bubble below the forming cone had many features similar to the measurements for a bubble with a blow-up ratio of 2.5[1].In the region above the forming cone,the upper jet appeared to merge with the lower jet rather than entraining the lower jet as was observed for a bubble with a blow-up ratio of 2.5[1].This resulted in a smaller local maximum in the normalized fluctuating pressure in the region above the forming cone and would likely result in less heat transfer in this region.It was also found that the initial angle of the upper jet exiting the air ring changed when the height of the bubble cone was adjusted for the bubble with the blow-up ratio of 3.5.This affected the static pressure in the region below the location where the upper jet attaches to the bubble and the pressure fluctuations in the region where the upper jet attaches to the surface.Finally,unlike the bubble with the blow-up-ratio of 2.5[I],the presence of the bubble cone caused a region of negative gauge pressure in the region above the forming cone that should act to stabilize the bubble against the bubble cone.The pressure in this region and the region below the forming cone both decreased when the porosity of the bubble cone was reduced.
机译：进行了一项实验研究，以表征吹塑比为3.5的固态模型的吹膜制造过程中使用的双唇空气环产生的流场，该吹气比与典型LLDPE气泡的形状相似。在双唇空气环上的一系列设置范围内，测量了模型上的静态和波动压力以及成型锥上方的流场，发现成型锥下方气泡上的压力分布具有许多特征类似于气泡比率为2.5 [1]的气泡的测量。在成形锥上方的区域中，上喷射流似乎与下喷射流合并，而不是像气泡那样观察到夹带下喷射流。爆破比为2.5 [1]。这导致在成形锥上方区域中归一化波动压力的局部最大值较小，并可能导致该区域中的热传递较少。还发现初始角度的当气泡的高度被调整为气泡比率为3.5时，离开空气环的上部射流发生了变化，这影响了上部射流附着到气泡的位置下方的区域中的静压，并且最后，与吹胀比为2.5 [I]的气泡不同，气泡锥的存在会在上方的区域上方产生负表压区域。当降低气泡锥的孔隙率时，应起到使气泡抵靠气泡锥稳定的作用。

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