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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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The International Association for Fire Safety Science (IAFSS) is delighted to announce that the 14th International Symposium on Fire Safety Science will be held from October 22 – 27, 2023 in Tsukuba, Japan.
Call for papers: https://t.co/iqzdpBxkZW

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A key mechanisms of wildfire spread: embers. They are pieces of biomass that are burning and fly long distances aided by wind, landing further away. They can generate spot fires ahead. Embers are also called firebrands. In 1666 London they were called fire drops.

BRIF PINOFRANQUEADO on Twitter

“La lluvia de pavesas es muy característica de los #incendiosforestales de sexta generación y pueden levantar llamas de más de 80m 🔥 Una ...

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22 Jun

True example of fire risks to critical infrastructure. Berkeley is not immune from this, our lines come into campus through Strawberry Canyon and have experienced PSPS before. Campus does not have 100% backup power capability.

Michael Wara@MichaelWWara

Folks may not have heard this but @Stanford is currently closed (for the indefinite future) due to 20acre wildfire that damaged the key @PGE4Me transmission lines that serve campus. I'm sure that the good people of @IBEWlocal1245 are working hard to restore power as we speak...

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21 Jun

The NJ Pine Barrens is the largest fire-adapted ecosystem in the Northeast and will occasionally see larger fires like this. I’ll be curious to see the fire effects!

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“New Start: New Jersey The Mullica River Fire. Local resources are telling me they are big boxing this fire. Currently the fire is reported at ...

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Retweet on TwitterMichael Gollner Retweeted
20 Jun

#MullicaRiverFire in New Jersey's Wharton State Forest could become state's largest in 15 years.

Mullica River Fire in New Jersey's Wharton State Forest could become state's largest in 15 years - Wildfire Today

Four miles northeast of Hammonton, NJ

wildfiretoday.com

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