Archivio Istituzionale della RicercaThe gas driven circulation enhancement in an adiabatic air -water loop has been investigated. The experimental facility consists of two vertical plexiglas pipes 3.8 m long, 0.08 m I.D. connected at the bottom by a horizontal pipe and at the top by a large open tank. Air is injected into the riser through a nozzle provided with several small radial holes. The pressure drop across the liquid single phase region has been changed by inserting calibrated orifices into the horizontal region. The data show the effect of the air flow rate and pressure losses on the liquid flow rate, void fraction, flow pattern, and recirculation ratio. The air pumping power has been experimentally estimated versus the liquid flow rate and the pneumatic efficiency has been evaluated. A model has been developed to evaluate the liquid flow rate as a function of the gas flow rate. The model gives a good prediction of the experimental results and allows to perform predictions for different conditions.
Gas driven circulation enhancement in an adiabatic air-water loop / DE SALVE, Mario; Malandrone, Mario; Panella, Bruno. - CD ROM ED. ETS:(2004), pp. 1-8. (Intervento presentato al convegno International Symposium on Two-Phase Flow Modelling and Experimentation nel Pisa, 22-24 September 2004).
Gas driven circulation enhancement in an adiabatic air-water loop
DE SALVE, Mario;MALANDRONE, Mario;PANELLA, BRUNO
2004
Abstract
The gas driven circulation enhancement in an adiabatic air -water loop has been investigated. The experimental facility consists of two vertical plexiglas pipes 3.8 m long, 0.08 m I.D. connected at the bottom by a horizontal pipe and at the top by a large open tank. Air is injected into the riser through a nozzle provided with several small radial holes. The pressure drop across the liquid single phase region has been changed by inserting calibrated orifices into the horizontal region. The data show the effect of the air flow rate and pressure losses on the liquid flow rate, void fraction, flow pattern, and recirculation ratio. The air pumping power has been experimentally estimated versus the liquid flow rate and the pneumatic efficiency has been evaluated. A model has been developed to evaluate the liquid flow rate as a function of the gas flow rate. The model gives a good prediction of the experimental results and allows to perform predictions for different conditions.
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https://hdl.handle.net/11583/1415739
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