Measurement of void fraction and velocity profiles in reactangular freefalling jets

  1. Patricio R. Ortega 1
  2. José M. Carrillo 1
  3. Luis G. Castillo 1
  4. Juan T. García 1
  1. 1 Universidad Politécnica de Cartagena
    info

    Universidad Politécnica de Cartagena

    Cartagena, España

    ROR https://ror.org/02k5kx966

Proceedings:
Proceedings of the 1st IAHR Young Professionals Congress: Online, 17 y 18 de noviembre de 2020

ISBN: 9789082484663

Year of publication: 2020

Type: Conference paper

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Abstract

Air entrainment generates energy dissipation in turbulent free-falling jets, where self-aeration processes reducethe velocity and increment the jet thickness. This experimental study presents an analysis of some air-waterproperties in rectangular free-falling jets. Two specific flows were considered with falling distances up to 1.2 m. Aconductivity phase-detection probe was used for measuring the void fraction distributions, while a Pitot-Prandtltube was used for measuring the velocity profiles. The jet thickness was also analyzed during the fall. The resultsshow the evolution of the inner jet core with slight differences in the upper and lower nappe, the aeration increment,and a small reduction of the velocity field during the fall.