The influence of inlet swirling on the aeration performance of liquid jet gas pumps

Abstract

Several jet pumps with swirling components in the driving jet flow are investigated experimentally for using them in aeration systems. Experimental measurements were carried out for the mixing system model using atmospheric air to increase the dissolved oxygen in tap water under different operating conditions and with four different swirl components. The effects of water temperature, jet pump pressure ratio, and jet pump number are then investigated. The mixing performance is remarkably improved by using a swirling flow compared with the non-swirling cases. This improvement is noticed when the required saturation time is decreased and the gas transfer efficiency is increased. Moreover, the improvement is shown to increased in relation to the swirl intensity used.

Keywords

aeration system dissolved oxygen jet pump swirling flow water quality

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References

Cunningham

, ‘Gas compression with the liquid jet pump’ Trans. ASME, J. Fluids Eng. I 96 3 (1974): 203–215.

Cunningham

Dopkin

, ‘Jet breakup and mixing throat lengths for the liquid-jet gas pump’ Trans. ASME, J. Fluids Eng. I 94 3 (1974): 216–226.

Kawaguty

Ueki

Akamine

Umeoka

, ‘Experimental research on an air mixed jet pump for sea water purification’ using distributed engines. Rev. Gën. Therm., 1998, 37, 305–314.

Kawaguty

, ‘Marine zone systems of higher productivity and purification using distributed engines’ Rev. Gën. Therm. 37 (1998): 305–314.

Sedeik

, Study of the manner of increasing the concentration of dissolved oxygen in water by using jet pump (2000) MS thesis.

Andreas

, ‘New jet-aeration system using ‘supercavitation’ Environ. Sci. Pollut. Res. Int. (2009): 0944–1344 DOI: 10.1007/s11356-009-0199-0.

Miller

Sheppard

, ‘Current status of turbine aeration activities at Alabama Power Company’ In Proceedings of WATERPOWER 83, ASCE, 1983.

Miller

Sheppard

, ‘Dissolved oxygen in hydro plant discharge increases by aeration’ Power Eng. (1982): 62–65.

Sincero

, Environmental engineering: A design approach (New Jersey: Prentice Hall 1995).

10.

Pontius

, Water quality and treatment. American water works association, a handbook of community water supplies (New York: McGraw Hill 1990).

11.

Hefny

, An experimental investigation of jet pumps with swirling components in the driving jet flow (2002) MS thesis Higher Institute of Energy, Aswan, 2002.