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Side-jet effects in high-pressure turbulent flows: Direct Numerical Simulation of nitrogen injected into carbon dioxide

Gnanaskandan, Aswin and Bellan, Josette (2018) Side-jet effects in high-pressure turbulent flows: Direct Numerical Simulation of nitrogen injected into carbon dioxide. Journal of Supercritical Fluids, 140 . pp. 165-181. ISSN 0896-8446. http://resolver.caltech.edu/CaltechAUTHORS:20180426-101117147

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Abstract

Direct Numerical Simulation realizations were generated of a round jet under high-pressure (high-p) turbulent conditions. In the simulations, a jet of nitrogen was injected into a chamber filled with carbon dioxide for three different jet-to-chamber density ratio, s, and three different chamber pressures, pch,0. The results show that for s = 0.5 and 0.35 side jets form whereas no side jets are observed for s = 1 ; thus providing, for the first time, evidence of side jet formation in high-p flows. Due to these side jets, mixing of the jet fluid and chamber fluid is promoted; although the species experience regular diffusional mixing, it is shown that due to turbulent conditions there can be effective uphill thermal conduction. Analysis of the vortical features of the side jets elucidated the process through which the enhanced mixing occurs: fluid from the jet is effectively pumped in the radial direction though the combined action of dilatation/compression and vortex stretching/shrinking. The value of s is shown to control radial and circumferential mixing versus axial mixing which occurs through jet penetration in the flow. Examination of dynamic and thermodynamic quantities indicates that side jets also promote flow unsteadiness. The pressure in the chamber is demonstrated to have negligible effect on the side jets.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.supflu.2018.04.015DOIArticle
https://www.sciencedirect.com/science/article/pii/S0896844617308926PublisherArticle
ORCID:
AuthorORCID
Bellan, Josette0000-0001-9218-7017
Additional Information:© 2018 Elsevier B.V. Received 6 December 2017, Revised 12 March 2018, Accepted 16 April 2018, Available online 24 April 2018. This work was conducted at the Jet Propulsion Laboratory (JPL) of the California Institute of Technology (Caltech) and sponsored by the Department of Energy (DOE), Basic Energy Sciences (BES) under the direction of Dr. Wade Sisk. The computational resources were provided by the NASA Advanced Supercomputing at Ames Research Center under the Aeronautics Research Mission Directorate program (Dr. Michael Rogers) and by National Energy Research Supercomputing Center of the Department of Energy with the allocation being provided by Dr. Mark Penderson.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:High-pressure mixing; Direct Numerical Simulation
Record Number:CaltechAUTHORS:20180426-101117147
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180426-101117147
Official Citation:Aswin Gnanaskandan, Josette Bellan, Side-jet effects in high-pressure turbulent flows: Direct Numerical Simulation of nitrogen injected into carbon dioxide, The Journal of Supercritical Fluids, Volume 140, 2018, Pages 165-181, ISSN 0896-8446, https://doi.org/10.1016/j.supflu.2018.04.015. (http://www.sciencedirect.com/science/article/pii/S0896844617308926)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86057
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Apr 2018 17:34
Last Modified:06 Jul 2018 17:33

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