An experimental research with water driven by air injected at the inlet of the vertical riser in an adiabatic air -water loop has been carried out. The experimental apparatus consists essentially of two vertical plexiglass tubes 3.8 m long, 0.08 m I.D., that are 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 test facility is equipped with differential pressure transducers and two quick closing valves to measure the pressure drops and the average void fraction respectively. 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 test results and allows the predictions for different conditions.

GAS DRIVEN CIRCULATION IN AN AIR-WATER LOOP / Panella, Bruno; Bertani, Cristina; DE SALVE, Mario; Malandrone, Mario. - In: INTERNATIONAL JOURNAL OF ENGINEERING AND INNOVATIVE TECHNOLOGY. - ISSN 2277-3754. - ELETTRONICO. - 4,:5(2014), pp. 81-88.

GAS DRIVEN CIRCULATION IN AN AIR-WATER LOOP

PANELLA, BRUNO;BERTANI, CRISTINA;DE SALVE, Mario;MALANDRONE, Mario
2014

Abstract

An experimental research with water driven by air injected at the inlet of the vertical riser in an adiabatic air -water loop has been carried out. The experimental apparatus consists essentially of two vertical plexiglass tubes 3.8 m long, 0.08 m I.D., that are 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 test facility is equipped with differential pressure transducers and two quick closing valves to measure the pressure drops and the average void fraction respectively. 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 test results and allows the predictions for different conditions.
File in questo prodotto:
File Dimensione Formato  
November 2014_IJEIT1412201411_15.pdf

non disponibili

Tipologia: 2. Post-print / Author's Accepted Manuscript
Licenza: Non Pubblico - Accesso privato/ristretto
Dimensione 453.5 kB
Formato Adobe PDF
453.5 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2588382
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo