The present paper studies the moisture effect on upward flame spread over cotton fabric by performing experiments using 0.245 mm thick, 180 cm tall and 10 cm wide sample sheets with moisture content ranging from 0% to 18%. As the moisture content increases, the flame height, pyrolysis height, burnout height, pyrolysis length and spread rate show the same trend, first increasing and then decreasing. The maximum value is observed in the case of the 2% moisture content samples. Furthermore, at an infinite length of fabric fuel, the upward flame propagation would reach an asymptotic steady state with constant pyrolysis length and spread rate. Finally, a higher moisture content corresponds to a lower flame temperature. For upward flame spread, the moisture content has the negative effects of increasing the thermal inertia parameters and reducing the flame temperature and heat feedback; simultaneously, the positive effect is that the moisture can enlarge the flame size and the effective preheating length. The combined effects of positive and negative effects result in the non-monotonous trend in the pyrolysis spread rate.
KrasnyJFBraunE. Textile flammability testing: appropriate levels for moisture content of specimens. Fire Mater1982; 6: 38–41.
2.
SegalLDrakeGLJ. The horizontal flame-propagation rate of undyed cotton fabrics. Text Res J1976; 46: 238–246.
3.
MillerBMartinJRGoswamiBCet al.The effects of moisture on the flammability characteristics of textile materials. Text Res J1975; 45: 328–337.
4.
TsaiKC. Upward flame spread on a flat surface, in a corner and between two parallel Surfaces. J Chin Soc Mech Eng Trans Chin Inst Eng Ser C2007; 28: 341–348.
5.
MarksteinGHde RisJ. Upward fire spread over textiles. Symp Combust1973; 14: 1085–1097.
6.
QuintiereJG. The effects of angular orientation on flame spread over thin materials. Fire Saf J2001; 36: 291–312.
7.
JohnstonMCT'ienJSMuffDEet al.Self induced buoyant blow off in upward flame spread on thin solid fuels. Fire Saf J2015; 71: 279–286.
8.
YingSJ. Flame propagation of burning solid material with moisture. Fire Technol1971; 7: 243–250.
9.
SafronavaNLyonRECrowleySet al.Effect of moisture on ignition time of polymers. Fire Technol2014; 51: 1093–1112.
10.
WongchaiPTachajapongW. Effects of moisture content in Para rubber leaf litter on critical mass flux and piloted ignition time. Energ Proc2015; 79: 448–452.
11.
JanssensM. Piloted ignition of wood: a review. Fire Mater1991; 15: 151–167.
12.
McAllisterS. Critical mass flux for flaming ignition of wet wood. Fire Saf J2013; 61: 200–206.
13.
PrationoWZhangJCuiJet al.Influence of inherent moisture on the ignition and combustion of wet Victorian brown coal in air-firing and oxy-fuel modes: Part 1: the volatile ignition and flame propagation. Fuel Proc Technol2015; 138: 670–679.
14.
RangwalaASBuckleySGToreroJL. Upward flame spread on a vertically oriented fuel surface: the effect of finite width. Proc Combust Inst2007; 31: 2607–2615.
15.
ArakawaASaitoKGruverWA. Automated infrared imaging temperature measurement with application to upward flame spread studies. Part I. Combust Flame1993; 92: 222–230.
16.
MeléndezJForondaAArandaJMet al.Infrared thermography of solid surfaces in a fire. Meas Sci Technol2010; 21: 105504–105504.
17.
MillerCHGollnerMJ. Upward flame spread over discrete fuels. Fire Saf J2015; 77: 36–45.
18.
UrbasJParkerWJLuebbersGE. Surface temperature measurements on burning materials using an infrared pyrometer: accounting for emissivity and reflection of external radiation. Fire Mater2004; 28: 33–53.
19.
ChengQIshidaHSaitoK. Upward flame spread along PMMA vertical corner walls Part II: mechanism of “M” shape pyrolysis front. Combust Flame1994; 99: 331–338.
20.
LiangCChengXLiKet al.Experimental study on flame spread behavior along poly(methyl methacrylate) corner walls at different altitudes. J Fire Sci2013; 32: 84–96.
21.
FletcherTHPickettBMSmithSGet al.Effects of moisture on ignition behavior of moist California Chaparral and Utah leaves. Combust Sci Technol2007; 179: 1183–203.
22.
TsaiKC. Influence of sidewalls on width effects of upward flame spread. Fire Saf J2011; 46: 294–304.
23.
HuLHLuKHTangFet al.A global non-dimensional factor characterizing side wall constraint effect on facade flame entrainment and flame height from opening of compartment fires. Int J Heat Mass Transf2014; 75: 122–129.
24.
LuYLiJLiXet al.The effect of air gaps in moist protective clothing on protection from heat and flame. J Fire Sci2012; 31: 99–111.
25.
HillCASNortonANewmanG. The water vapor sorption behavior of natural fibers. J Appl Polym Sci2009; 112: 1524–1537.
26.
CeylanÖLanduytLVMeulewaeterFet al.Moisture sorption in developing cotton fibers. Cellulose2012; 19: 1517–1526.
27.
CeylanÖGoubetFClerckKD. Dynamic moisture sorption behavior of cotton fibers with natural brown pigments. Cellulose2014; 21: 1149–1161.
