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首页> 外文会议>First Joint Conference IAHR-IWA on Pumps, Electromechanical Devices and Systems Applied to Urban Water Management Vol.2; 2003; Polytechnic University of Valencia Spain >An investigation on unsteady-state friction in laminar flow
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An investigation on unsteady-state friction in laminar flow

机译：层流非稳态摩擦的研究

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摘要

In recent years the increased complexity of pipe systems in both civil and industrial engineering applications determined an intense research activity concerning unsteady-state energy dissipation. In the present paper, attention is focused on laminar transients since they are mathematically tractable as well as there is no influence of the chosen turbulence model. Specifically, comparisons between quasi-2D and 1D numerical models are presented along with new laboratory data. Some peculiarities of laminar transients are pointed out with respect to high initial Reynolds number transients. An innovative procedure for evaluating unsteady friction is then proposed and checked.
机译：近年来，在土木工程和工业工程应用中，管道系统日益复杂，这决定了有关非稳态能耗的大量研究活动。在本文中，注意力集中在层流瞬变上，因为它们在数学上是易处理的，并且不受所选湍流模型的影响。具体来说，将提供准2D和1D数值模型之间的比较以及新的实验室数据。指出了关于高初始雷诺数瞬变的层流瞬变的一些特殊性。然后提出并检查了一种用于评估非定常摩擦的创新方法。

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