Limitations in the Use of the Equivalent Diameter
| Autor: | Francesco Saverio D'Auria, G. M. Galassi, Licia Del Frate, Fabio Moretti |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Pressure drop
business.industry Turbulence 020209 energy CFX Laminar flow equivalent diameter 02 engineering and technology Mechanics Computational fluid dynamics Physics::Fluid Dynamics NEPTUNE_CFD Square Rod Bundle equivalent diameter CFD CFX NEPTUNE_CFD 0202 electrical engineering electronic engineering information engineering Range (statistics) Hydraulic diameter CFD business Mathematics |
| Zdroj: | World Journal of Nuclear Science and Technology. :53-62 |
| ISSN: | 2161-6809 2161-6795 |
| Popis: | This paper deals with the inaccuracy assessment of the friction pressure loss estimation based on Darcy formula combined with an equivalent hydraulic diameter and a friction factor valid for circular pipes when applied to a square rod bundle. The assessment has been done by comparing the analytical and semi-empirical predictions with two different CFD codes results: CFX and NEPTUNE_CFD. Two different analytical approaches have been considered: the whole-bundle and sub-channel approaches, both for laminar and turbulent flow conditions. Looking at results, it is reasonable to assume that an error in the range of 11% - 23% is likely when using equivalent diameter in the laminar regime. In the case of turbulent regime, the equivalent diameter works better and the error is in the range between a few percent and ~12%. |
| Databáze: | OpenAIRE |
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