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On the Trajectory and Reach of Fire-suppressant Liquid Nitrogen Droplets Released from a Spray Nozzle by Aobo Liu; Michael A. Delichatsios; Yiannis A. Levendis is a Engineering article available to read on EtoBox.

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Liquid nitrogen (LN 2 ) can be used to supplement or replace currently used fire extinguishers in challenging fire situations. This environmentally-benign cryogenic fluid can be produced readily from deep refrigeration of air. This manuscript addresses the application of liquid nitrogen to fires through a nozzle. Its aim is to investigate the survivability of LN 2 droplets, following breakup of the jet exiting the nozzle, and the amount of liquid that reaches a target. Numerical simulations were carried out to explore the effects of relevant parameters, such as the initial droplet size and velocity, the droplet injection angle, and the thermal radiation on the droplet flight distance and the liquid droplet mass. The results indicate that all these parameters influence the fate of the LN 2 droplets. Coarse atomization, high initial velocities, short nozzleto-target distances, and shallow jet angles maximize the amount of the cryogen delivered to the target. A small-scale experiment was performed to test the results of the calculations. The comparison of the experimental results and the theoretical calculations was deemed satisfactory. In both cases the reach of the liquid droplets w

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Author

Aobo Liu; Michael A. Delichatsios; Yiannis A. Levendis

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)