Oxygenation by Hollow Plunging Water Jet

Oxygenation by a plunging water jet is a more attractive way to effect oxygen-transfer than conventional oxygenation systems. A lot of work has been reported on the oxygen-transfer by plunging water jets. However, few studies have been carried out on hollow plunging jet. In this paper, volumetric oxygen-transfer coefficient and oxygen-transfer efficiency has been studied experimentally for hollow plunging jet in a pool of water for different thicknesses of jets. This research suggests that the volumetric oxygen-transfer coefficient and oxygen-transfer efficiency of the hollow plunging jet for air-water system are competitive with other types of aeration systems. Further, relationships of volumetric oxygen-transfer coefficient with jet power per unit volume and jet parameters are also proposed. The suggested relationships predict the volumetric oxygen-transfer coefficient for hollow plunging water jet within a scatter of ±15%.Key words: hollow plunging jet, oxygenation, volumetric oxygen-transfer coefficient, oxygentransfer efficiency, jet power.Journal of the Institute of Engineering, Vol. 7, No. 1, 2009 July pp. 40-47doi: 10.3126/jie.v7i1.2061

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Air-Water Oxygen Transfer with Multiple Plunging Jets

Water Quality Research Journal ◽

10.2166/wqrj.2007.031 ◽

2007 ◽

Vol 42 (4) ◽

pp. 295-302 ◽

Cited By ~ 8

Author(s):

Surinder Deswal ◽

Dharam Veer Singh Verma

Keyword(s):

Transfer Coefficient ◽

Oxygen Transfer ◽

Water Systems ◽

Transfer Efficiency ◽

Flow Area ◽

Oxygen Transfer Coefficient ◽

Water Oxygen ◽

Oxygen Transfer Efficiency ◽

Plunging Jets ◽

Volumetric Oxygen Transfer Coefficient

Abstract Despite numerous works reporting on oxygen transfer by plunging jets, few studies have been carried out on multiple plunging jets. In this paper, the volumetric oxygen-transfer coefficient and oxygen-transfer efficiency of multiple plunging jets in a pool of water for different configurations in terms of varying numbers of jets and jet diameters were studied experimentally. This research suggests that the volumetric oxygen-transfer coefficient and oxygen-transfer efficiency of the multiple plunging jets for air/water systems were significantly higher than those of a single plunging jet for same flow area and other similar conditions. A relationship between the volumetric oxygen-transfer coefficient and jet parameters is also proposed. The suggested relationship predicted the volumetric oxygen-transfer coefficient for single and multiple plunging jet(s) within a scatter of ±15%.

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The Effect of Nozzle Type on Air Entrainment by Plunging Water Jets

Water Quality Research Journal ◽

10.2166/wqrj.2002.040 ◽

2002 ◽

Vol 37 (3) ◽

pp. 599-612 ◽

Cited By ~ 23

Author(s):

Tamer Bagatur ◽

Ahmet Baylar ◽

Nusret Sekerdag

Keyword(s):

Penetration Depth ◽

Oxygen Transfer ◽

Free Water ◽

Air Entrainment ◽

Water Jet ◽

Transfer Efficiency ◽

Entrainment Rate ◽

Water Jets ◽

Air Entrainment Rate ◽

Oxygen Transfer Efficiency

Abstract In this study, for the plunging water jet aeration system using various inclined nozzle types, bubble penetration depth, air entrainment rate, water jet expansion, effect of water jet circumference at impact point, oxygen transfer coefficient and oxygen transfer efficiency which changed depending on the water jet velocity, were researched in an air-water system. Numerous studies were conducted with circular nozzles. The present study describes new experiments performed with different nozzle types. Three types of nozzles were examined, i.e., those with circular, ellipse and rectangle duct with rounded ends. Experimental results showed that water jets produced with ellipse and rectangle duct with rounded ends nozzles have very different flow characteristics, entrainment patterns on free water jet surface, and submerged water jet region within the receiving tank. Higher air entrainment rate and oxygen transfer efficiency was observed in the rectangle duct with rounded ends nozzle due to water jet expansion. Bubble penetration depth, however, is lower for the rectangle duct with rounded ends nozzle than for the other nozzles. The ellipse nozzle provided the highest bubble penetration depth. These results showed that it is appropriate to use ellipse nozzle in aeration of deep pool and rectangle duct with rounded ends nozzle in the applications where high bubble concentration is desirable.

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