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| Natura: | Artículo científico |
| Lingua: | en |
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Academia Brasileira de Ciências
2010
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=32713482027 |
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Sommario:
- Lower nappe aeration in smooth channels: experimental data and numerical simulation Eudes J. Arantes Rodrigo M. Porto John S. Gulliver Alberto C.M. Lima Harry E. Schulz Multidisciplinaria (Ciencias Naturales y Exactas) air water flows air entrainment multiphase flows Spillway aerators Bed aerators designed to increase air void ratio are used to prevent cavitation and related damages in spillways. Air entrained in spillway discharges also increases the dissolved oxygen concentration of the water, which can be important for the downstream fishery. This study considers results from a systematic series of measurements along the jet formed by a bed aerator, involving concentration profiles, pressure profiles, velocity fields and corresponding air discharges. The experimental results are, then, compared, with results of computational fluid dynamics (CFD) simulations with the aim of predicting the air discharge numerically. Comparisons with jet lengths and the air entrainment coefficients from the literature are also made. It is shown that numerical predictive tools furnish air discharges comparable to measured values. However, if more detailed predictions are desired, verification experiments are still necessary. 2010 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32713482027 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.2 Vol.82