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化工学报  2014 

挤出塑料管喷淋冷却的数值模拟

DOI: 10.3969/j.issn.0438-1157.2014.06.015, PP. 2056-2062

Keywords: 挤出塑料管,喷淋冷却,喷嘴,瞬态,对流,换热,数值模拟,整体优化

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Abstract:

冷却系统是塑料挤出管道生产工艺中的关键设备,其冷却的均匀性和效率直接影响管道产品的质量及生产速度。首先基于ANSYS对喷淋冷却瞬态传热进行模拟,结果表明:对流传热系数小于180W·m-2·K-1时,冷却至目标温度(47℃)所需的时间随传热系数的变化明显;传热系数大于180W·m-2·K-1时,冷却至目标温度所需的时间随传热系数的变化不大。然后基于FLUENT软件对喷淋喷嘴进行模拟,研究了喷淋入口速度、喷嘴高度对喷淋传热系数的影响,结果表明:随着喷淋入口速度的增加(6~15m·s-1的范围内),总体对流传热系数增大,驻点处的传热系数由217W·m-2·K-1增加到386W·m-2·K-1;随喷淋高度的减小(68~128mm范围内),壁面传热系数呈增加趋势,驻点处传热系数由227W·m-2·K-1增加到311W·m-2·K-1。基于以上研究,为真空定径喷淋冷却水槽的整体优化提出合理建议。

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