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New Paper Published in Combustion and Flame

March 8, 2021 by Michael Gollner

Comparison of particulate-matter emissions from liquid-fueled pool fires and fire whirls

Combustion and Flame

By: Sriram BharathHariharanabHamed FarmahiniFarahanibcAli S.RangwalacJoseph L.DowlingbElaine S.OrandMichael J.Gollnerab

 

Free link: https://authors.elsevier.com/a/1ccZ%7E2KiHU7kW

Regular link: https://www.sciencedirect.com/science/article/pii/S0010218020305824?dgcid=author

Image

 

Abstract

In-situ burning (ISB) is one of the most effective means of removing oil spilled over open water. While current ISB practices can eliminate a large fraction of the spilled oil, they still result in significant airborne emissions of particulate matter. ISBs are classified as large, free-buoyant pool fires, from which black smoke consisting of particulate matter (PM, soot) emanates as a plume. An experimental investigation of soot emissions from pool fires (PF) and fire whirls (FW) was conducted using liquid hydrocarbon fuels, n-heptane and Alaska North Slope (ANS) crude oil, in fuel pools cm in diameter. Burning attributes such as burning rate, fuel-consumption efficiency, and emissions of PM, unburned hydrocarbons, carbon dioxide, and oxygen consumption were measured. For both fuels and all pool diameters, compared to PFs, FWs consumed fuel at a higher rate, had lower post-combustion residual mass and PM emission rates. Collectively, these resulted in consistently lower PM emission factors (EF) for FWs at all scales. For FWs, EF decreased linearly with a nondimensional quantity defined as the ratio of inverse Rossby number to nondimensional heat-release rate. These results show that the addition of ambient circulation to free-burning PFs to form FWs can increase burning efficiency, reducing both burning duration and EF across length scales. The reduction in EF with increasing influence of circulation is attributed to a feedback loop of higher temperatures, heat feedback, burning rate and air-entrainment velocity, which in turn contributes to maintaining the structure of a FW. Boilover was observed for fires formed with ANS crude oil at the 70 cm scale, although the overall EF was not affected significantly. This investigation presents a foundation to evaluate the detailed mechanisms further, such that appropriate configurations can be developed help minimize the environmental impact of ISBs.

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Michael GollnerFollow5,9302,353

Michael Gollner
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4 Feb

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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