Limitations in the Use of the Equivalent Diameter

机译：当量直径的使用限制

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This paper deals with the inaccuracy assessment of the friction pressure loss estimation based on\udDarcy formula combined with an equivalent hydraulic diameter and a friction factor valid for circular\udpipes when applied to a square rod bundle. The assessment has been done by comparing the analytical\udand semi-empirical predictions with two different CFD codes results: CFX and NEPTUNE_CFD.\udTwo different analytical approaches have been considered: the whole-bundle and sub-channel approaches,\udboth for laminar and turbulent flow conditions. Looking at results, it is reasonable to\udassume that an error in the range of 11% - 23% is likely when using equivalent diameter in the\udlaminar regime. In the case of turbulent regime, the equivalent diameter works better and the error\udis in the range between a few percent and ~12%.

机译：本文基于\ udDarcy公式，结合当量液压直径和适用于方管的圆管的摩擦系数，对基于\ udDarcy公式的摩擦压力损失估算的不准确评估进行处理。通过将分析\ ud和半经验预测与两种不同的CFD代码结果进行比较来进行评估：CFX和NEPTUNE_CFD。\ ud已经考虑了两种不同的分析方法：全束和子通道方法，\对于层流和子通道两种方法湍流条件。从结果看，\ udlaminar方案中使用等效直径时，可以合理地假定误差可能在11％到23％之间。在湍流状态下，当量直径效果更好，误差\ udis在百分之几到〜12％的范围内。

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Del Frate, L.; Moretti, F.; Galassi, G. M.; D’Auria, F.;
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年度 2016
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Limitations in the Use of the Equivalent Diameter

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