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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
    
Cooling mechanism of condensed water film on surface of mould cavity under large temperature difference
DUAN Jun-jie, YI Guo-dong, ZHANG Shu-you
State Key Lab of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China
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Abstract  

The traditional method of cooling analysis based on the mold-product two-layer model didn’t consider the impact of condensed water film on the cooling process, which was difficult to describe the evolution process of temperature in the cooling stage accurately. Aiming at this problem, the three-layer composite model of mould-water film-product (MWP model) under large temperature difference was established in this paper. Dirichlet boundary condition and Neumann boundary condition of Thermodynamics were adopted to improve the coupling calculation of adjacent layers of transient heat conduction, and the three-layer model was used to analyze the cooling stage of thin-walled hollow blow molding products. It is concluded that condensed water film can shorten the cooling time of thin-walled hollow blow molding products and improve the uniformity of cooling by comparing the effects of condensed water film about cooling time and cooling uniformity of products.

Published: 01 August 2015
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DUAN Jun-jie, YI Guo-dong, ZHANG Shu-you. Cooling mechanism of condensed water film on surface of mould cavity under large temperature difference. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2015, 49(8): 1478-1486.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2015.08.011     OR     http://www.zjujournals.com/eng/Y2015/V49/I8/1478


大温差工况下模具发汗水膜冷却机理

 针对传统的基于模具-制品双层模型冷却分析方法未考虑发汗水膜对冷却过程的影响、难以准确描述成型冷却温度演变过程的问题,提出大温差工况下模具-水膜-制品三层复合模型（MWP模型）.采用热力学第1类和第3类边界条件进行相邻层的非稳态导热耦合计算,利用MWP模型对薄壁中空吹塑制品的冷却过程进行分析,通过对比发汗水膜对制品冷却时间及冷却均匀性的影响,结果表明：发汗水膜能够缩短薄壁中空吹塑制品冷却时间并提高其冷却均匀性.

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