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Title: A new method to calculate unsteady particle kinematics and drag coefficient in a subsonic post-shock flow

Abstract

In this paper, we introduce a new method (piecewise integrated dynamics equation fit, PIDEF) that uses the particle dynamics equation to determine unsteady kinematics and drag coefficient (C D) for a particle in subsonic post-shock flow. The uncertainty of this method is assessed based on simulated trajectories for both quasi-steady and unsteady flow conditions. Traditional piecewise polynomial fitting (PPF) shows high sensitivity to measurement error and the function used to describe C D, creating high levels of relative error (>>1) when applied to unsteady shock-accelerated flows. The PIDEF method provides reduced uncertainty in calculations of unsteady acceleration and drag coefficient for both quasi-steady and unsteady flows. This makes PIDEF a preferable method over PPF for complex flows where the temporal response of C D is unknown. Finally, we apply PIDEF to experimental measurements of particle trajectories from 8-pulse particle tracking and determine the effect of incident Mach number on relaxation kinematics and drag coefficient of micron-sized particles.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [1];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Arizona State Univ., Tempe, AZ (United States). School for Engineering of Matter, Transport and Energy
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1440444
Report Number(s):
LA-UR-17-31279
Journal ID: ISSN 0957-0233
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Measurement Science and Technology
Additional Journal Information:
Journal Volume: 29; Journal Issue: 7; Journal ID: ISSN 0957-0233
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; particle tracking accelerometry; kinematics measurement; shock-particle interaction; unsteady drag

Citation Formats

Bordoloi, Ankur D., Ding, Liuyang, Martinez, Adam A., Prestridge, Katherine, and Adrian, Ronald J.. A new method to calculate unsteady particle kinematics and drag coefficient in a subsonic post-shock flow. United States: N. p., 2018. Web. doi:10.1088/1361-6501/aac076.
Bordoloi, Ankur D., Ding, Liuyang, Martinez, Adam A., Prestridge, Katherine, & Adrian, Ronald J.. A new method to calculate unsteady particle kinematics and drag coefficient in a subsonic post-shock flow. United States. doi:10.1088/1361-6501/aac076.
Bordoloi, Ankur D., Ding, Liuyang, Martinez, Adam A., Prestridge, Katherine, and Adrian, Ronald J.. Thu . "A new method to calculate unsteady particle kinematics and drag coefficient in a subsonic post-shock flow". United States. doi:10.1088/1361-6501/aac076.
@article{osti_1440444,
title = {A new method to calculate unsteady particle kinematics and drag coefficient in a subsonic post-shock flow},
author = {Bordoloi, Ankur D. and Ding, Liuyang and Martinez, Adam A. and Prestridge, Katherine and Adrian, Ronald J.},
abstractNote = {In this paper, we introduce a new method (piecewise integrated dynamics equation fit, PIDEF) that uses the particle dynamics equation to determine unsteady kinematics and drag coefficient (C D) for a particle in subsonic post-shock flow. The uncertainty of this method is assessed based on simulated trajectories for both quasi-steady and unsteady flow conditions. Traditional piecewise polynomial fitting (PPF) shows high sensitivity to measurement error and the function used to describe C D, creating high levels of relative error (>>1) when applied to unsteady shock-accelerated flows. The PIDEF method provides reduced uncertainty in calculations of unsteady acceleration and drag coefficient for both quasi-steady and unsteady flows. This makes PIDEF a preferable method over PPF for complex flows where the temporal response of C D is unknown. Finally, we apply PIDEF to experimental measurements of particle trajectories from 8-pulse particle tracking and determine the effect of incident Mach number on relaxation kinematics and drag coefficient of micron-sized particles.},
doi = {10.1088/1361-6501/aac076},
journal = {Measurement Science and Technology},
number = 7,
volume = 29,
place = {United States},
year = {Thu Apr 26 00:00:00 EDT 2018},
month = {Thu Apr 26 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
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