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Wind Effects on Smoldering Behavior of Simulated Wildland Fuels

Jeanette Cobian-Iñiguez, Franz Richter, Luca Camignani, Christina Liveretou, Hanyu Xiong, Scott Stephens, Mark Finney, Michael Gollner & Carlos Fernandez-Pello: Wind Effects on Smoldering Behavior of Simulated Wildland Fuels. In: Combustion Science and Technology, vol. 0, pp. 1-18, 2022.

Abstract

The current study presents a series of experiments investigating the smoldering behavior of woody fuel arrays at various porosities under the influence of wind. Wildland fuels are simulated using wooden cribs burned inside a bench scale wind tunnel. Smoldering behavior was characterized using measurements of both mass loss and emissions. Results showed that the mean burning rate increased with wind speed for all cases. In high porosity cases, increases in burning rate between 18% and 54% were observed as wind speed increased. For low porosity cases an increase of about 170% in burning rate was observed between 0.5 and 0.75 m/s. The ratio of CO/CO2 emissions decreased with wind speed. Thus, wind likely served to promote smoldering combustion as indicated by the decrease of CO/CO2 which is a marker of combustion efficiency. A theoretical analysis was conducted to assess the exponential decay behavior in the time-resolved mass loss data. Mass and heat transfer models were applied to assess whether oxygen supply or heat losses can solely explain the observed exponential decay. The analysis showed that neither mass transfer nor heat transfer alone can explain the exponential decay, but likely a combination thereof is needed

Links

  • http://firelab.berkeley.edu/wp-content/uploads/2022/12/2022-CST-Wind-Effects-on-[...]
  • doi:10.1080/00102202.2021.2019239

BibTeX (Download)

@article{cobian2022,
title = {Wind Effects on Smoldering Behavior of Simulated Wildland Fuels},
author = {Jeanette Cobian-I\~{n}iguez, Franz Richter, Luca Camignani, Christina Liveretou,
Hanyu Xiong, Scott Stephens, Mark Finney, Michael Gollner \& Carlos Fernandez-Pello},
url = {http://firelab.berkeley.edu/wp-content/uploads/2022/12/2022-CST-Wind-Effects-on-Smoldering-Behavior-of-Simulated-Wildland-Fuels.pdf},
doi = {10.1080/00102202.2021.2019239},
year  = {2022},
date = {2022-01-05},
urldate = {2022-01-05},
journal = {Combustion Science and Technology},
volume = {0},
pages = {1-18},
abstract = {The current study presents a series of experiments investigating the smoldering behavior of woody fuel arrays at various porosities under the influence of wind. Wildland fuels are simulated using wooden cribs burned inside a bench scale wind tunnel. Smoldering behavior was characterized using measurements of both mass loss and emissions. Results showed that the mean burning rate increased with wind speed for all cases. In high porosity cases, increases in burning rate between 18% and 54% were observed as wind speed increased. For low porosity cases an increase of about 170% in burning rate was observed between 0.5 and 0.75 m/s. The ratio of CO/CO2 emissions decreased with wind speed. Thus, wind likely served to promote smoldering combustion as indicated by the decrease of CO/CO2 which is a marker of combustion efficiency. A theoretical analysis was conducted to assess the exponential decay behavior in the time-resolved mass loss data. Mass and heat transfer models were applied to assess whether oxygen supply or heat losses can solely explain the observed exponential decay. The analysis showed that neither mass transfer nor heat transfer alone can explain the exponential decay, but likely a combination thereof is needed},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

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The large #wildfires in #Chile are spreading quickly across large areas of non-native plantations of radiata pine and eucalyptus, many of them planted by foreigners during a dictatorship. These maps show recent MODIS heat detections on top of mapping of plantations (purple). 1/x

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4 Feb

Tragic wildfire situation in Chile.

Tragic wildfire situation in Chile.
TheHotshotWakeUp: Podcast@HotshotWake

Absolute chaos in Chile today. 7 people have been reported killed so far during this week’s fires. I am getting reports from helicopter pilots down there working, seeing whole villages run over while they try to operate. Unreal accounts coming out of the country #Chile #wildfire

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2 Feb

U.S. Senator Dianne Feinstein, Colleagues Introduce Bipartisan, Bicameral Bill to Boost Efficient, Effective Forest Management

U.S. Senator Dianne Feinstein, Colleagues Introduce Bipartisan, Bicameral Bill to Boost Efficient, Effective Forest Management

U.S. Senator Dianne Feinstein, Colleagues Introduce Bipartisan, Bicameral Bill to Boost Efficient, Effective Forest Management

goldrushcam.com

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2 Feb

Western wildfires destroyed 246% more homes and buildings over the past decade – fire scientists explain what's changing via @ConversationUS

Western wildfires destroyed 246% more homes and buildings over the past decade – fire scientists explain what's changing

More homes are burning in wildfires in nearly every Western state. The reason? Humans.

theconversation.com

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31 Jan

Excellent warning sign… though not sure this should be in a partially enclosed space….🤔🤔🤔🤔

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Image for the Tweet beginning: Excellent warning sign… though not
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