Original scientific paper

Measurements of Air Concentration and Velocities in a Free Falling Water Jet

Freddy Florez ; Institute of Hydraulic Engineering and Water Resources Management, Vienna University of Technology, Wien Austria
Reinhard Prenner ; Institute of Hydraulic Engineering and Water Resources Management, Vienna University of Technology, Wien Austria
Norbert Krouzecky ; Institute of Hydraulic Engineering and Water Resources Management, Vienna University of Technology, Wien Austria

Abstract

The prediction of air entrainment in a free falling water jet (two-phase flow) is affected by large uncertainties. A current research project at the Vienna University of Technology is dealing with this phenomenon by means of experimental tests and CFD-calculations. The experimental investigation was conducted in order to measure the air concentration in such a free falling jet using a fibre-optic probe. The velocity was measured with a high speed camera. The tests were performed on a jet which exits a circular pipe with a diameter of 40 mm. The air concentration was measured transversally at several distances away from the nozzle exit. The test results should provide a data basis for CFD-calculations of the air entrainment in a further research step.

Keywords

air entrainment; free falling water jet; air concentration; fibre-optic probe

Hrčak ID:

155341

URI

https://hrcak.srce.hr/155341

Publication date:

8.4.2016.

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