The effect of moisture content and thermal behaviour on the ignition of Eucalyptus saligna leaves
Mohamad L. Ramadhan
A B , Jeronimo Carrascal A , Andres Osorio A and Juan P. Hidalgo A
+ Author Affiliations
- Author Affiliations
A School of Civil Engineering, The University of Queensland, St Lucia, Qld 4072, Australia.
B Corresponding author. Email: m.ramadhan@uq.edu.au
International Journal of Wildland Fire 30(9) 680-690 https://doi.org/10.1071/WF20069
Submitted: 5 May 2020 Accepted: 2 June 2021 Published: 21 June 2021
Abstract
Fuel moisture content is one of the key parameters controlling the flaming ignition of wildland fuel. However, the role of fuel moisture content in assessing the flammability of different fuel curing (dead and live fuel) is still not well understood. This paper presents the results of ignition tests of fuel beds consisting of dead and live Eucalyptus saligna leaves under a wide range of moisture contents. External heat flux and fuel moisture content are shown to significantly influence time to ignition and mass loss rate at the ignition of Eucalyptus saligna leaves, thus illustrating distinctive heating processes in the fuel bed. The thermal behaviour of the leaf bed before ignition is analysed using the analytical solution to the heat conduction equation, as the classical ignition correlations yield inconclusive results. This approach allows identification of thermally thick and thin behaviours for distinct ranges of heating, with the transition (thermally intermediate) region observed at higher external heat fluxes for higher moisture content. Additionally, a flammability assessment based on time to ignition confirms the inadequacy of the common assumption that live fuel can be considered as moist dead fuel.
Keywords: critical heat flux, flammability, fuel curing, ignitability, fuel bed, moisture content, thermal behaviour, wildland fire.
References
ABARES (2016) ‘Australian forest profiles: Australia’s forests.’ (Australian Bureau of Agricultural and Resource Economics and Sciences: Canberra)Albini FA (1967) A physical model for firespread in brush. Symposium (International) on Combustion 11, 553–560.
| A physical model for firespread in brush.Crossref | GoogleScholarGoogle Scholar |
Atreya A, Carpentier C, Harkleroad M (1986) Effect of sample orientation on piloted ignition and flame spread. Fire Safety Science 1, 97–109.
| Effect of sample orientation on piloted ignition and flame spread.Crossref | GoogleScholarGoogle Scholar |
Babrauskas V (2002) Ignition of wood: a review of the state of the art. Journal of Fire Protection Engineering 12, 163–189.
| Ignition of wood: a review of the state of the art.Crossref | GoogleScholarGoogle Scholar |
Belcher CM (2016) The influence of leaf morphology on litter flammability and its utility for interpreting palaeofire. Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences 371, 20150163
| The influence of leaf morphology on litter flammability and its utility for interpreting palaeofire.Crossref | GoogleScholarGoogle Scholar | 27216520PubMed |
Benkoussas B, Consalvi J, Porterie B, Sardoy N, Loraud J (2007) Modelling thermal degradation of woody fuel particles. International Journal of Thermal Sciences 46, 319–327.
| Modelling thermal degradation of woody fuel particles.Crossref | GoogleScholarGoogle Scholar |
Dahanayake KC, Chow CL (2018) Moisture content, ignitability, and fire risk of vegetation in vertical greenery systems. Fire Ecology 14, 125–142.
| Moisture content, ignitability, and fire risk of vegetation in vertical greenery systems.Crossref | GoogleScholarGoogle Scholar |
Delichatsios MA (2000) Ignition times for thermally thick and intermediate conditions in flat and cylindrical geometries. Fire Safety Science 6, 233–244.
| Ignition times for thermally thick and intermediate conditions in flat and cylindrical geometries.Crossref | GoogleScholarGoogle Scholar |
Dibble AC, White RH, Lebow PK (2007) Combustion characteristics of north-eastern USA vegetation tested in the cone calorimeter: invasive versus non-invasive plants. International Journal of Wildland Fire 16, 426–443.
| Combustion characteristics of north-eastern USA vegetation tested in the cone calorimeter: invasive versus non-invasive plants.Crossref | GoogleScholarGoogle Scholar |
Dimitrakopoulos AP, Papaioannou KK (2001) Flammability assessment of Mediterranean forest fuels. Fire Technology 37, 143–152.
| Flammability assessment of Mediterranean forest fuels.Crossref | GoogleScholarGoogle Scholar |
Fateh T, Richard F, Batiot B, Rogaume T, Luche J, Zaida J (2016) Characterization of the burning behavior and gaseous emissions of pine needles in a cone calorimeter–FTIR apparatus. Fire Safety Journal 82, 91–100.
| Characterization of the burning behavior and gaseous emissions of pine needles in a cone calorimeter–FTIR apparatus.Crossref | GoogleScholarGoogle Scholar |
Ferguson SC, Dahale A, Shotorban B, Mahalingam S, Weise DR (2013) The role of moisture on combustion of pyrolysis gases in wildland fires. Combustion Science and Technology 185, 435–453.
| The role of moisture on combustion of pyrolysis gases in wildland fires.Crossref | GoogleScholarGoogle Scholar |
Fletcher TH, Pickett BM, Smith SG, Spittle GS, Woodhouse MM, Haake E, Weise DR (2007) Effects of moisture on ignition behavior of moist California Chaparral and Utah leaves. Combustion Science and Technology 179, 1183–1203.
| Effects of moisture on ignition behavior of moist California Chaparral and Utah leaves.Crossref | GoogleScholarGoogle Scholar |
Gallacher JR (2016) The influence of season, heating mode and slope angle on wildland fire behavior. PhD thesis. Brigham Young University, Provo, UT. Available at https://scholarsarchive.byu.edu/etd/5691
Gallacher JR, Lansinger V, Hansen S, Weise DR, Fletcher TH (2015) Effects of season and heating mode on ignition and burning behavior of ten species of live fuel measured in a flat-flame burner system. In ‘9th US National Combustion Meeting’, Cincinnati, OH. (Cincinnati, OH)
Hidalgo JP, Hadden R, Welch S, Pironi P (2016) Effect of thickness on the ignition behavior of carbon fibre composite materials used in high pressure vessels. In ‘Eighth International Seminar on Fire & Explosion Hazards’, Hefei, China. pp. 353–363. (USTC Press Hefei, China)
Hines F, Tolhurst KG, Wilson AAG, Mccarthy GJ (2010) Overall fuel hazard assessment guide. 4th edition July 2010. Fire and adaptive management, report no. 82 (Victorian Government Department of Sustainability and Environment: Melbourne, Victoria) Available at https://www.ffm.vic.gov.au/__data/assets/pdf_file/0005/21110/Report-82-overall-fuel-assess-guide-4th-ed.pdf
Incropera FP, DeWitt DP, Bergman TL, Lavine AS (2013) ‘Principles of heat and mass transfer.’ (John Wiley and Sons Ltd.: Singapore)
International Organization for Standardization (2014) ‘ISO 17554:2014 Reaction to fire tests – Mass loss measurement.’ (ISO: Geneva, Switzerland)
Janssens M (1991) Piloted ignition of wood: A review. Fire and Materials 15, 151–167.
| Piloted ignition of wood: A review.Crossref | GoogleScholarGoogle Scholar |
Jervis FX, Rein G (2016) Experimental study on the burning behaviour of Pinus halepensis needles using small-scale fire calorimetry of live, aged and dead samples. Fire and Materials 40, 385–395.
| Experimental study on the burning behaviour of Pinus halepensis needles using small-scale fire calorimetry of live, aged and dead samples.Crossref | GoogleScholarGoogle Scholar |
Jolly WM, Parsons RA, Hadlow AM, Cohn GM, McAllister SS, Popp JB, Hubbard RM, Negron JF (2012) Relationships between moisture, chemistry, and ignition of Pinus contorta needles during the early stages of mountain pine beetle attack. Forest Ecology and Management 269, 52–59.
| Relationships between moisture, chemistry, and ignition of Pinus contorta needles during the early stages of mountain pine beetle attack.Crossref | GoogleScholarGoogle Scholar |
Khan MM, De Ris JL, Ogden SD (2008) Effect of moisture on ignition time of cellulosic materials. Fire Safety Science 9, 167–178.
| Effect of moisture on ignition time of cellulosic materials.Crossref | GoogleScholarGoogle Scholar |
Long RT, Torero JL, Quintiere JG, Fernandez-Pello AC (2000) Scale and transport considerations on piloted ignition of PMMA. Fire Safety Science 6, 567–578.
| Scale and transport considerations on piloted ignition of PMMA.Crossref | GoogleScholarGoogle Scholar |
McAllister S, Weise DR (2014) Effects of season on ignition of three species of live wildland fuels using the FIST apparatus. In ‘Western States Section of the Combustion Institute Spring Technical Meeting 2014’, pp. 551–562. (Combustion Institute – Western States Section) Available at https://www.firescience.gov/projects/11-1-4-19/project/11-1-4-19_14S-47.pdf
McAllister S, Weise DR (2017) Effects of season on ignition of live wildland fuels using the forced ignition and flame spread test apparatus. Combustion Science and Technology 189, 231–247.
| Effects of season on ignition of live wildland fuels using the forced ignition and flame spread test apparatus.Crossref | GoogleScholarGoogle Scholar |
McAllister S, Chen J-Y, Fernandez-Pello AC (2011) ‘Fundamentals of combustion processes.’ (Springer)
McAllister S, Grenfell I, Hadlow A, Jolly WM, Finney M, Cohen J (2012) Piloted ignition of live forest fuels. Fire Safety Journal 51, 133–142.
| Piloted ignition of live forest fuels.Crossref | GoogleScholarGoogle Scholar |
Mindykowski P, Fuentes A, Consalvi JL, Porterie B (2011) Piloted ignition of wildland fuels. Fire Safety Journal 46, 34–40.
| Piloted ignition of wildland fuels.Crossref | GoogleScholarGoogle Scholar |
Mindykowski P, Jørgensen M, Svensson S, Jomaas G (2019) A simple correlation for monitoring the ignition propensity of wet nordic spruce wood. Fire Safety Journal 107, 186–192.
| A simple correlation for monitoring the ignition propensity of wet nordic spruce wood.Crossref | GoogleScholarGoogle Scholar |
Pickard RW, Wraight H (1961) The effect of moisture on the igntion and flame propagation of thin cellulosic materials. Fire Research Notes 450. (Fire Research Station: Boreham Woods, UK) Available at https://www.iafss.org/publications/frn/450/-1/view/frn_450.pdf
Pickett BM, Isackson C, Wunder R, Fletcher TH, Butler BW, Weise DR (2010) Experimental measurements during combustion of moist individual foliage samples. International Journal of Wildland Fire 19, 153–162.
| Experimental measurements during combustion of moist individual foliage samples.Crossref | GoogleScholarGoogle Scholar |
Possell M, Bell TL (2013) The influence of fuel moisture content on the combustion of eucalyptus foliage. International Journal of Wildland Fire 22, 343–352.
| The influence of fuel moisture content on the combustion of eucalyptus foliage.Crossref | GoogleScholarGoogle Scholar |
Ramadhan ML, Zarate-Orrego SA, Carrascal J, Osorio AF, Hidalgo JP (2019) Experimental study on the flammability and burning behaviour of live and dead Eucalyptus Saligna foliage. In ‘Proceedings of the 9th International Seminar on Fire and Explosion Hazards (ISFEH9)’, St Petersburg. pp. 1041–1052. (Saint Petersburg Polytechnic University Press)
Ramadhan ML, Zarate S, Carrascal J, Osorio AF, Hidalgo JP (2021) Effect of fuel bed size and moisture on the flammability of Eucalyptus saligna leaves in cone calorimeter testing. Fire Safety Journal 120, 103016
| Effect of fuel bed size and moisture on the flammability of Eucalyptus saligna leaves in cone calorimeter testing.Crossref | GoogleScholarGoogle Scholar |
Reszka P, Cruz JJ, Valdivia J, González F, Rivera J, Carvajal C, Fuentes A (2020) Ignition delay times of live and dead Pinus radiata needles. Fire Safety Journal 112, 102948
| Ignition delay times of live and dead Pinus radiata needles.Crossref | GoogleScholarGoogle Scholar |
Rothermel RC (1972) A mathematical model for predicting fire spread in wildland fuels. USDA Forest Service, Intermountain Forest and Range Experiment Station, Research Paper INT-RP-115. (Ogden, UT)
Santoni PA, Bartoli P, Simeoni A, Torero JL (2014) Bulk and particle properties of pine needle fuel beds – influence on combustion. International Journal of Wildland Fire 23, 1076–1086.
| Bulk and particle properties of pine needle fuel beds – influence on combustion.Crossref | GoogleScholarGoogle Scholar |
Shotorban B, Yashwanth BL, Mahalingam S, Haring DJ (2018) An investigation of pyrolysis and ignition of moist leaf-like fuel subject to convective heating. Combustion and Flame 190, 25–35.
| An investigation of pyrolysis and ignition of moist leaf-like fuel subject to convective heating.Crossref | GoogleScholarGoogle Scholar |
Simeoni A, Thomas JC, Bartoli P, Borowieck P, Reszka P, Colella F, Santoni PA, Torero JL (2012) Flammability studies for wildland and wildland–urban interface fires applied to pine needles and solid polymers. Fire Safety Journal 54, 203–217.
| Flammability studies for wildland and wildland–urban interface fires applied to pine needles and solid polymers.Crossref | GoogleScholarGoogle Scholar |
Simms DL, Law M (1967) The ignition of wet and dry wood by radiation. Combustion and Flame 11, 377–388.
| The ignition of wet and dry wood by radiation.Crossref | GoogleScholarGoogle Scholar |
Sullivan AL, McCaw WL, Cruz MG, Matthews S, Ellis PF (2012) Fuel, fire weather and fire behaviour in Australian ecosystems. ‘Flammable Australia: Fire Regimes, Biodiversity and Ecosystems in a Changing World’. (Eds RA Bradstock, AM Gill, RJ Williams) pp. 51–77. (CSIRO Publishing)
Thomas JC (2016) Improving the understanding of fundamental mechanisms that influence ignition and burning behavior of porous wildland fuel beds. PhD thesis. University of Edinburgh.
Thomas JC, Everett JN, Simeoni A, Skowronski N, Torero JL (2013) Flammability study of pine needle beds. In ‘Proceedings of the 7th International Seminar on Fire & Explosion Hazards (ISFEH7)’, pp. 978–981 (Research Publishing Services)
Tihay V, Simeoni A, Santoni P, Rossi L, Garo J (2009) Experimental study of laminar flames obtained by the homogenization of three forest fuels. International Journal of Thermal Sciences 48, 488–501.
| Experimental study of laminar flames obtained by the homogenization of three forest fuels.Crossref | GoogleScholarGoogle Scholar |
Torero J (2016) Flaming ignition of solid fuels. In ‘SFPE Handbook of Fire Protection Engineering, Fifth Edition’. pp. 633–661. (Springer: New York)
Torero JL, Simeoni A (2010) Heat and mass transfer in fires: scaling laws, ignition of solid fuels and application to forest fires. The Open Thermodynamics Journal 4, 145–155.
| Heat and mass transfer in fires: scaling laws, ignition of solid fuels and application to forest fires.Crossref | GoogleScholarGoogle Scholar |
Weise DR, White RH, Beall FC, Etlinger M (2005) Use of the cone calorimeter to detect seasonal differences in selected combustion characteristics of ornamental vegetation. International Journal of Wildland Fire 14, 321–338.
| Use of the cone calorimeter to detect seasonal differences in selected combustion characteristics of ornamental vegetation.Crossref | GoogleScholarGoogle Scholar |
White RH, Service F, Weise DR, Service F, Mackes K (2002) Cone calorimeter testing of vegetation: an update. In ‘Proceedings of the 35th International Conference on Fire Safety’, Sissonville. 1–12. (Products Safety Corporation: Sissonville)
