Comparison of measured leak rates and calculation values for sealing packages,Packaging Technology and Science

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Comparison of measured leak rates and calculation values for sealing packages
Packaging Technology and Science ( IF 2.8 ) Pub Date : 2021-06-03 , DOI: 10.1002/pts.2594
Hajime Yoshida ₁ , Mao Hirata ₂ , Tsutomu Hara ₂ , Yasuhiko Higuchi ₂

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It is often necessary to calculate a leak rate from the size of leak hole and vice versa for testing of sealing packages such as foods, medicines and dangerous goods. These calculations are actually rather complicated because the characteristics of the gas flow through the leak hole change depending on the pressure, the gas species, the temperature and the diameter d and length l of the leak hole. In this study, the air flow rate through 12 flow channels with the inner diameter of 5–50 μm and the l/d ratio of 0.72–260 were measured by a pressure change method and compared with the predictions of the equations governing laminar, turbulent, compressible and molecular flow, as well as those of a developed combined governing equation (modified Knudsen equation). The modified Knudsen equation provided good agreement within 20% over the entire range of experimental conditions, including the transition region between laminar and compressible flow.

中文翻译：

密封包装的实测泄漏率和计算值的比较

通常需要根据泄漏孔的大小计算泄漏率，反之亦然，用于食品、药品和危险品等密封包装的测试。这些计算实际上是相当复杂的，因为通过泄漏孔的气体流动的特性根据压力、气体种类、温度以及泄漏孔的直径d和长度l而变化。在本研究中，空气流速通过 12 个内径为 5-50 μm 的流道，l / d0.72-260 的比率是通过压力变化方法测量的，并与控制层流、湍流、可压缩和分子流的方程的预测以及开发的组合控制方程（修正的 Knudsen 方程）的预测进行比较。修改后的 Knudsen 方程在整个实验条件范围内（包括层流和可压缩流之间的过渡区域）在 20% 内提供了良好的一致性。

更新日期：2021-08-05

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