Realizing microgravity flame spread characteristics at 1 g over a bed of nano-aluminum powder

J. Y. Malchi, J. Prosser, Richard A. Yetter, S. F. Son

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

Nanoscale aluminum (nAl) powders demonstrate relatively fast counter-flow flame spread rates compared to typical fuels such as Poly(methyl methacrylate) or cellulose at similar conditions. This allows for the dominant forward heat transfer mechanism to be through the solid fuel at higher applied oxidizer velocities, and flame structure characteristics typically observed in microgravity to be realized at 1 g conditions. Because of the porosity of the nAl powder, the gaseous oxidizer can diffuse into the bed and reactions within the solid phase become important. Using an energy balance applied to only the solid phase, an analytical model is developed which predicts the experiments for flame spread over a nAl bed. Moreover, an explanation for fingering phenomenon is established based on the effective Lewis and Damköhler numbers. This allows for an explanation of why flame spread over a bed of nAl will demonstrate this fingering instability in a quiescent, 1 g environment without a top plate to hinder buoyant flows.

Original languageEnglish (US)
Pages (from-to)2437-2444
Number of pages8
JournalProceedings of the Combustion Institute
Volume32 II
Issue number2
DOIs
StatePublished - Jan 1 2009
Event32nd International Symposium on Combustion - Montreal, QC, Canada
Duration: Aug 3 2008Aug 8 2008

Fingerprint

Microgravity
microgravity
Aluminum
Powders
beds
flames
aluminum
oxidizers
solid phases
Lewis numbers
counterflow
Polymethyl Methacrylate
Energy balance
Polymethyl methacrylates
cellulose
polymethyl methacrylate
Cellulose
Analytical models
Porosity
heat transfer

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

Cite this

@article{880ef00e42bf4b2bb02f5c4311ad18f0,
title = "Realizing microgravity flame spread characteristics at 1 g over a bed of nano-aluminum powder",
abstract = "Nanoscale aluminum (nAl) powders demonstrate relatively fast counter-flow flame spread rates compared to typical fuels such as Poly(methyl methacrylate) or cellulose at similar conditions. This allows for the dominant forward heat transfer mechanism to be through the solid fuel at higher applied oxidizer velocities, and flame structure characteristics typically observed in microgravity to be realized at 1 g conditions. Because of the porosity of the nAl powder, the gaseous oxidizer can diffuse into the bed and reactions within the solid phase become important. Using an energy balance applied to only the solid phase, an analytical model is developed which predicts the experiments for flame spread over a nAl bed. Moreover, an explanation for fingering phenomenon is established based on the effective Lewis and Damk{\"o}hler numbers. This allows for an explanation of why flame spread over a bed of nAl will demonstrate this fingering instability in a quiescent, 1 g environment without a top plate to hinder buoyant flows.",
author = "Malchi, {J. Y.} and J. Prosser and Yetter, {Richard A.} and Son, {S. F.}",
year = "2009",
month = "1",
day = "1",
doi = "10.1016/j.proci.2008.09.007",
language = "English (US)",
volume = "32 II",
pages = "2437--2444",
journal = "Proceedings of the Combustion Institute",
issn = "1540-7489",
publisher = "Elsevier Limited",
number = "2",

}

Realizing microgravity flame spread characteristics at 1 g over a bed of nano-aluminum powder. / Malchi, J. Y.; Prosser, J.; Yetter, Richard A.; Son, S. F.

In: Proceedings of the Combustion Institute, Vol. 32 II, No. 2, 01.01.2009, p. 2437-2444.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Realizing microgravity flame spread characteristics at 1 g over a bed of nano-aluminum powder

AU - Malchi, J. Y.

AU - Prosser, J.

AU - Yetter, Richard A.

AU - Son, S. F.

PY - 2009/1/1

Y1 - 2009/1/1

N2 - Nanoscale aluminum (nAl) powders demonstrate relatively fast counter-flow flame spread rates compared to typical fuels such as Poly(methyl methacrylate) or cellulose at similar conditions. This allows for the dominant forward heat transfer mechanism to be through the solid fuel at higher applied oxidizer velocities, and flame structure characteristics typically observed in microgravity to be realized at 1 g conditions. Because of the porosity of the nAl powder, the gaseous oxidizer can diffuse into the bed and reactions within the solid phase become important. Using an energy balance applied to only the solid phase, an analytical model is developed which predicts the experiments for flame spread over a nAl bed. Moreover, an explanation for fingering phenomenon is established based on the effective Lewis and Damköhler numbers. This allows for an explanation of why flame spread over a bed of nAl will demonstrate this fingering instability in a quiescent, 1 g environment without a top plate to hinder buoyant flows.

AB - Nanoscale aluminum (nAl) powders demonstrate relatively fast counter-flow flame spread rates compared to typical fuels such as Poly(methyl methacrylate) or cellulose at similar conditions. This allows for the dominant forward heat transfer mechanism to be through the solid fuel at higher applied oxidizer velocities, and flame structure characteristics typically observed in microgravity to be realized at 1 g conditions. Because of the porosity of the nAl powder, the gaseous oxidizer can diffuse into the bed and reactions within the solid phase become important. Using an energy balance applied to only the solid phase, an analytical model is developed which predicts the experiments for flame spread over a nAl bed. Moreover, an explanation for fingering phenomenon is established based on the effective Lewis and Damköhler numbers. This allows for an explanation of why flame spread over a bed of nAl will demonstrate this fingering instability in a quiescent, 1 g environment without a top plate to hinder buoyant flows.

UR - http://www.scopus.com/inward/record.url?scp=61849161552&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=61849161552&partnerID=8YFLogxK

U2 - 10.1016/j.proci.2008.09.007

DO - 10.1016/j.proci.2008.09.007

M3 - Conference article

AN - SCOPUS:61849161552

VL - 32 II

SP - 2437

EP - 2444

JO - Proceedings of the Combustion Institute

JF - Proceedings of the Combustion Institute

SN - 1540-7489

IS - 2

ER -