AWWA ACE61707

This paper studies the phenomenon ofgaseous cavitation from a theoretical and practical perspective. A simulated distribution system wasconstructed to track gaseous cavitation using four independent measurements including visual observation ofbubbles, an inline turbidimeter, an ultrasonic flow meter, and an inline total dissolved gas probe. All fourmeasurements confirmed that gaseous cavitation was occurring within the experimental distribution system, evenat relatively high system pressures. Gaseous cavitation increased at higher initial dissolved gas contents and wasaffected by temperature. Certain changes in pH, conductivity, and surfactant addition also tended to increase thelikelihood of cavitation. For example, compared to the control at 30 psig system pressure, the turbidity increased295% at pH 9.9. These bubbles in turn reduced the pump's operating efficiency causing the system velocity to be17% lower. Cavitation clearly occurred in these experiments even though calculations suggested that it wasunlikely. Includes 12 references, table, figures.

Product Details

Edition:

Vol. - No.

Published:

06/17/2005

Number of Pages:

20

File Size:

1 file , 480 KB