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Title: Vortex rings drive entrainment and cooling in flow induced by a spark discharge

Abstract

Spark plasma discharges induce vortex rings and a hot gas kernel. We develop a model to describe the late stage of the spark-induced flow and the role of the vortex rings in the entrainment of cold ambient gas and the cooling of the hot gas kernel. The model is tested in a plasma-induced flow using density and velocity measurements obtained from simultaneous stereoscopic particle image velocimetry and background oriented schlieren. We show that the spatial distribution of the hot kernel follows the motion of the vortex rings, whose radial expansion increases with the electrical energy deposited during the spark discharge. Here, the vortex ring cooling model establishes that entrainment in the convective cooling regime is induced by the vortex rings and governs the cooling of the hot gas kernel, and the rate of cooling increases with the electrical energy deposited during the spark discharge.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Purdue Univ., West Lafayette, IN (United States)
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1756082
Grant/Contract Number:  
SC0018156
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Fluids
Additional Journal Information:
Journal Volume: 5; Journal Issue: 11; Journal ID: ISSN 2469-990X
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Heat transfer; Plasma discharges; Vortex flows; Convection; Particle image velocimetry

Citation Formats

Singh, Bhavini, Rajendran, Lalit K., Zhang, Jiacheng, Vlachos, Pavlos P., and Bane, Sally P. M.. Vortex rings drive entrainment and cooling in flow induced by a spark discharge. United States: N. p., 2020. Web. https://doi.org/10.1103/physrevfluids.5.114501.
Singh, Bhavini, Rajendran, Lalit K., Zhang, Jiacheng, Vlachos, Pavlos P., & Bane, Sally P. M.. Vortex rings drive entrainment and cooling in flow induced by a spark discharge. United States. https://doi.org/10.1103/physrevfluids.5.114501
Singh, Bhavini, Rajendran, Lalit K., Zhang, Jiacheng, Vlachos, Pavlos P., and Bane, Sally P. M.. Fri . "Vortex rings drive entrainment and cooling in flow induced by a spark discharge". United States. https://doi.org/10.1103/physrevfluids.5.114501. https://www.osti.gov/servlets/purl/1756082.
@article{osti_1756082,
title = {Vortex rings drive entrainment and cooling in flow induced by a spark discharge},
author = {Singh, Bhavini and Rajendran, Lalit K. and Zhang, Jiacheng and Vlachos, Pavlos P. and Bane, Sally P. M.},
abstractNote = {Spark plasma discharges induce vortex rings and a hot gas kernel. We develop a model to describe the late stage of the spark-induced flow and the role of the vortex rings in the entrainment of cold ambient gas and the cooling of the hot gas kernel. The model is tested in a plasma-induced flow using density and velocity measurements obtained from simultaneous stereoscopic particle image velocimetry and background oriented schlieren. We show that the spatial distribution of the hot kernel follows the motion of the vortex rings, whose radial expansion increases with the electrical energy deposited during the spark discharge. Here, the vortex ring cooling model establishes that entrainment in the convective cooling regime is induced by the vortex rings and governs the cooling of the hot gas kernel, and the rate of cooling increases with the electrical energy deposited during the spark discharge.},
doi = {10.1103/physrevfluids.5.114501},
journal = {Physical Review Fluids},
number = 11,
volume = 5,
place = {United States},
year = {2020},
month = {11}
}

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