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Effect of Nozzle Exit Turbulence on the Column Trajectory and Breakup Location of a Transverse Liquid Jet in a Gaseous Flow

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Abstract

This study examines the effect of fully developed turbulent flow at the exit of nozzle/injector on the trajectory and column breakup location of a liquid jet injected transverly into a gaseous crossflow. Liquid jet trajectory and column breakup for different nozzle geometries at different velocities of liquid jet and crossflow are analytically and experimentally Investigated. Shadowgraph imaging technique is used to determine the jet trajectory and breakup location of a transverse liquid jet in a uniform airflow. Particle image velocimetry (PIV) is used to measure the near-field velocity profile of a liquid jet discgarged into a quiescent atmosphere. The experimental results show a higher penetration and breakup height for the liquid jet ensuing from a nozzle with a smaller length to diameter ratio. This is due to the surface irregularities of the liquid column of a turbulent jet, which breaks up and consequently follows the cross airflow sooner. In order to capture the effect of turbulence, the analytical trajectory correlation developed in our previous studies is modified to account for the discharge coefficient of a nozzle. The discharge coefficient is estimated indirectly by comparing the liquid column trajectory predicted by the modified analytical correlation with that determined experimentally. The indirectly determined discharge coefficient is then used in the analytical correlation for predicting the breakup height of a transverse liquid jet. The results predicted using this approach are in good agreement with the experimental data of the present study at standard temperature and pressure (STP) test conditions.

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Acknowledgments

The financial support provided by the Natural Sciences and Engineering Research Council of Canada (NSERC) and the University of Manitoba Graduate Fellowship (UMGF) is gratefully appreciated.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Manitoba, Winnipeg, Manitoba, R3T 5V6, Canada

    Mohsen Broumand, Graham Rigby & Madjid Birouk

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  1. Mohsen Broumand
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  2. Graham Rigby
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  3. Madjid Birouk
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Correspondence to Madjid Birouk.

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Broumand, M., Rigby, G. & Birouk, M. Effect of Nozzle Exit Turbulence on the Column Trajectory and Breakup Location of a Transverse Liquid Jet in a Gaseous Flow. Flow Turbulence Combust 99, 153–171 (2017). https://doi.org/10.1007/s10494-017-9806-1

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  • DOI: https://doi.org/10.1007/s10494-017-9806-1

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