The hydraulic working of reservoir outlets is often affected by the phenomenon of air entrainment connected with the outflow of water stream. As a consequence the evaluation of flow rate of entrained air is in order to verify the working conditions. Both in scientific research and in technical practice a coefficient called "beta" is used for the assessment of the phenomenon: it is the ratio between flow rate of entrained air and water flow rate. The present paper reports the results of a study carried out in a physical model of large dimensions reproducing a reservoir outlet consisting of a vertical shaft supplied by an orifice at the base of a storage tank. The authors used an original experimental technique and a particular elaboration method in order to obtain a formula for determination of coefficient "beta". The results, though achieved in a particular case, contribute to the choice and the specifications of the parameters by which the phenomenon is characterized.

Air entrainment in a particular reservoir outlet

PULCI DORIA, GUELFO
2004

Abstract

The hydraulic working of reservoir outlets is often affected by the phenomenon of air entrainment connected with the outflow of water stream. As a consequence the evaluation of flow rate of entrained air is in order to verify the working conditions. Both in scientific research and in technical practice a coefficient called "beta" is used for the assessment of the phenomenon: it is the ratio between flow rate of entrained air and water flow rate. The present paper reports the results of a study carried out in a physical model of large dimensions reproducing a reservoir outlet consisting of a vertical shaft supplied by an orifice at the base of a storage tank. The authors used an original experimental technique and a particular elaboration method in order to obtain a formula for determination of coefficient "beta". The results, though achieved in a particular case, contribute to the choice and the specifications of the parameters by which the phenomenon is characterized.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11588/305696
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