A technique for extrapolating absorption coefficient measurements to high temperatures

Effects of fuel absorption on radiative heat transfer in methanol pool fires

“…The averaged temperatures and species concentrations were used for calculating the spectrally resolved absorption coefficient needed in the radiative transport equation which was integrated from the flame location back to the pool surface. For these calculations, a semi-empirical correlation based on a three-parameter fit [25] of the quantum molecular line intensity equation for each wavenumber provided a means for calculating each j m as a function of T. Figure 5 shows that H 2 O and CO 2 are the principle emitting species near and outside of the actual flame. The methanol mole fraction only becomes significant below a height of 0.3 m (or 0.26 m above the liquid surface).…”

“…For the high temperature measurements, the ZnSe windows were externally cooled to maintain high spectral transmissivity. Further details of the setup are provided elsewhere [25,26].…”

“…The limited data on spectrally resolved radiation absorption coefficients of fuel species relevant for pool fires has motivated recent research [25,26] to measure fuel radiation absorption coefficients over a range of temperatures (up to 1000 K) that might be expected to exist inside a pool fire flame in the fuel rich core. This research has further explored the importance of spectrally resolved radiation absorption properties in liquid pool fires.…”

Thermal degradation of Poly(methyl methacrylate) with a 1.064 μm Nd:YAG laser in a buoyant flow

“…Using the semi-quantitative technique developed in Ref. [36] where the experimental absorption coefficient is adjusted with empirical parameters, the database has been extended to 1400 K and interpolated in 50 K increments. A sample of this database is provided in Fig.…”

Study on the gas pressure characteristics of photoacoustic spectroscopy detection for dissolved gases in transformer oil

“…So absorption coefficient ) (λ α ∑ can be described as [13] ) 6 ( 296 Therefore, absorption coefficient is proportional to the gas pressure P theoretically. Based on database HITRAN2008, the influence of pressure on peak absorption coefficient of gas absorption line of the C 2 H 2 , CH 4 and CO 2 in the same order of magnitude at 296K can be counted out using Voigt line theory [14][15][16].…”