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Title: Computational characterization of the secondary droplets formed during the impingement of a train of ethanol drops

Abstract

This paper uniquely characterizes the secondary droplets formed during the impingement of a train of ethanol drops, using three-dimensional direct numerical simulations performed under conditions studied experimentally by Yarin and Weiss. Our numerical results have been previously validated against experimental data demonstrating the ability to accurately capture the splashing dynamics. In this work, the predictive ability of the model is leveraged to gain further insight into secondary droplet formation. We present a robust post-processing algorithm, which scrutinizes the liquid volume fraction field in the volume-of-fluid method and quantifies the number, volume and velocity of secondary droplets. The high-resolution computational simulations enable secondary droplet characterization within close proximity of the impingement point at small length and time scales, which is extremely challenging to achieve experimentally. By studying the temporal evolution of secondary droplet formation, direct connections are made between liquid structures seen in the simulation and the instantaneous distribution of secondary droplets, leading to detailed insight into the instability-driven breakup process of lamellae. Time-averaged secondary droplet characteristics are also studied to describe the global distribution of secondary droplets. Such analysis is vital to understanding fuel drop impingement in direct injection engines, facilitating the development of highly accurate spray–wall interaction models formore » use in Lagrangian solvers.« less

Authors:
ORCiD logo [1];  [1];  [1];  [2]; ORCiD logo [3]
  1. Univ. of Massachusetts, Dartmouth, MA (United States)
  2. Michigan Technological Univ., Houghton, MI (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); US Department of the Navy, Office of Naval Research (ONR); US Department of the Army, Tank and Automotive Research, Development, and Engineering Center (TARDEC)
OSTI Identifier:
1599181
Grant/Contract Number:  
AC02-06CH11357; EE007292; N00014-18-1-2255
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Engine Research
Additional Journal Information:
Journal Volume: 21; Journal Issue: 2; Journal ID: ISSN 1468-0874
Publisher:
SAGE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Droplet impingement; Secondary droplets; Spray-wall interaction

Citation Formats

Markt, David, Pathak, Ashish, Raessi, Mehdi, Lee, Seong-Young, and Torelli, Roberto. Computational characterization of the secondary droplets formed during the impingement of a train of ethanol drops. United States: N. p., 2019. Web. doi:10.1177/1468087419879623.
Markt, David, Pathak, Ashish, Raessi, Mehdi, Lee, Seong-Young, & Torelli, Roberto. Computational characterization of the secondary droplets formed during the impingement of a train of ethanol drops. United States. doi:https://doi.org/10.1177/1468087419879623
Markt, David, Pathak, Ashish, Raessi, Mehdi, Lee, Seong-Young, and Torelli, Roberto. Thu . "Computational characterization of the secondary droplets formed during the impingement of a train of ethanol drops". United States. doi:https://doi.org/10.1177/1468087419879623. https://www.osti.gov/servlets/purl/1599181.
@article{osti_1599181,
title = {Computational characterization of the secondary droplets formed during the impingement of a train of ethanol drops},
author = {Markt, David and Pathak, Ashish and Raessi, Mehdi and Lee, Seong-Young and Torelli, Roberto},
abstractNote = {This paper uniquely characterizes the secondary droplets formed during the impingement of a train of ethanol drops, using three-dimensional direct numerical simulations performed under conditions studied experimentally by Yarin and Weiss. Our numerical results have been previously validated against experimental data demonstrating the ability to accurately capture the splashing dynamics. In this work, the predictive ability of the model is leveraged to gain further insight into secondary droplet formation. We present a robust post-processing algorithm, which scrutinizes the liquid volume fraction field in the volume-of-fluid method and quantifies the number, volume and velocity of secondary droplets. The high-resolution computational simulations enable secondary droplet characterization within close proximity of the impingement point at small length and time scales, which is extremely challenging to achieve experimentally. By studying the temporal evolution of secondary droplet formation, direct connections are made between liquid structures seen in the simulation and the instantaneous distribution of secondary droplets, leading to detailed insight into the instability-driven breakup process of lamellae. Time-averaged secondary droplet characteristics are also studied to describe the global distribution of secondary droplets. Such analysis is vital to understanding fuel drop impingement in direct injection engines, facilitating the development of highly accurate spray–wall interaction models for use in Lagrangian solvers.},
doi = {10.1177/1468087419879623},
journal = {International Journal of Engine Research},
number = 2,
volume = 21,
place = {United States},
year = {2019},
month = {10}
}

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