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首页> 外文期刊>Applied Mathematical Modelling >Modelling The Attenuation Of Laminar Fluid Transientsin Piping Systems
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Modelling The Attenuation Of Laminar Fluid Transientsin Piping Systems

机译:建模管道系统中层流瞬态的衰减

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摘要

The damping of laminar fluid transients in piping systems is studied numerically using a two-dimensional water hammer model. The numerical scheme is based on the classical fourth order Runge-Kutta method for time integration and central difference expressions for the spatial terms. The results of the present method show that the damping of transients in piping systems is governed by a non-dimensional parameter representing the ratio of the Joukowsky pressure force to the viscous force. In terms of time scales, this non-dimensional parameter represents the ratio of the viscous diffusion time scale to the pipe period. For small values of this parameter, the damping of the fluid transient becomes more pronounced while for large values, the fluid transient is subjected to insignificant damping. Moreover, the non-dimensional parameter is shown to influence other important transient phenomena such as line packing, instantaneous wall shear stress values and the Richardson annular effect.
机译:使用二维水锤模型对管道系统中层流瞬态的阻尼进行了数值研究。该数值方案基于用于时间积分的经典四阶Runge-Kutta方法和空间项的中心差分表达式。本方法的结果表明,管道系统中瞬态的阻尼受一个无量纲参数控制,该参数代表Joukowsky压力与粘性力之比。就时间尺度而言,此无量纲参数表示粘性扩散时间尺度与管道周期的比率。对于该参数的较小值,流体瞬态的阻尼变得更加明显,而对于较大的值,流体瞬态的阻尼很小。此外,已显示出无量纲参数会影响其他重要的瞬态现象,例如线堆积,瞬时壁切应力值和理查森环形效应。

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