化工学报2017，Vol.68Issue(4)：1306-1317,封4,13.DOI:10.11949/j.issn.0438-1157.20161529
矩形截面微模具通道中熔体的黏性耗散效应
Viscous dissipation effect of polymer melt in a rectangular cross section micro mold channel
摘要
Abstract
Based on the theoretical analysis of viscous dissipation effect when polymer melt flowing in micro injection mold, the change of the melt temperature of the polypropylene (PP) and high density polyethylene (HDPE) caused by the viscous dissipation effect were tested and simulated in the rectangular cross section micro channels with different equivalent diameters and ratios of length to diameter under a variety of process parameters. The results showed that the theoretical calculation and numerical simulation values were highly consistent with the test results, and the average errors were all less than 1℃. The study found that when the equivalent diameter and ratios of length to diameter were increased, the heat of viscous dissipation increased, thus the outlet temperature of channel rose. When the geometry size of the micro channels remains unchanged, the viscous dissipation heat increased with the increase of the injection speed and injection pressure, and decreased with the increase of the melt temperature and mold temperature. But under the same test condition, the viscous dissipation heat of PP material which is more sensitive to shear was obviously higher than that of HDPE.关键词
微通道/非牛顿流体/黏性耗散/试验测量/数值模拟Key words
microchannels/non-Newtonian fluids/viscous dissipation/experimental measurement/numerical simulation分类
化学化工引用本文复制引用
于同敏,张拯恺,邹德健..矩形截面微模具通道中熔体的黏性耗散效应[J].化工学报,2017,68(4):1306-1317,封4,13.基金项目
国家自然科学基金项目(51175060, 51575080).supported by the National Natural Science Foundation of China (51175060, 51575080). （51175060, 51575080）
