Temperature field measurements using thin filament pyrometry in a medium-scale methanol pool fire

Wang, Zhigang; Tam, Wai Cheong; Lee, Ki Yong; Hamins, Anthony P.

doi:10.6028/nist.tn.2031

Cited by 4 publications

(5 citation statements)

References 12 publications

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“…[33] are also shown, where temperature was measured using a 75 μm wire diameter, bare bead, Type S thermocouple in a steadily burning 30.1 cm diameter methanol pool fire with a 0.5 cm lip. The radiation corrected thermocouple measurements in Wang et al [34] are also shown, using a 50 μm wire diameter, bare bead, Type S thermocouple in a steadily burning 30.1 cm diameter methanol pool fire with a 1 cm lip height. A comparison of the results in Figure 21 shows that the 1 m and 30 cm pool temperatures are similar when the axial distance above the burner is normalized by ̇2 /5 .…”

Section: Valuementioning

confidence: 80%

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The thermal character of a 1 m methanol pool fire

Sung¹,

Chen²,

Bundy³

et al. 2021

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A series of measurements was conducted to characterize the structure of a 1 m diameter methanol pool fire steadily burning with a constant lip height in a well-ventilated quiescent environment. Time-averaged local measurements of gas-phase temperature were conducted using 50 μm diameter, Type S, bare wire, thermocouples with a bead that was approximately spherical with a diameter of about 150 μm. The thermocouple bead temperature was corrected for radiative loss and thermal inertia effects. The contribution of the radiative loss correction and thermal inertia correction terms to uncertainty of the gas velocity was analyzed. A simulation of the 1 m methanol pool fire was conducted using the Fire Dynamics Simulator (FDS) to obtain the gas velocity distribution above the burner which helped correct the thermocouple temperature measurement to obtain the gas temperature. The gas temperature distribution profile above the burner centerline was compared to previous studies of a 30 cm methanol fire. The maximum mean gas temperature was 1371 K, which occurred 30 cm above the burner on the centerline. Careful analysis determined that the average combined uncertainty of the mean and the standard deviation of the measured gas temperature was 5 % and 26 %, respectively. The actual heat release rate was measured using oxygen consumption calorimetry and compared favorably with the ideal heat release rate calculated from the measured mass burning rate. The heat flux distribution about the pool fire was measured using fourteen wide-angle view, water-cooled, Gardon-type, total heat flux gauges. The radiative emission from the fire was estimated by considering the radiative heat flux through a virtual cylinder about the fire and by a single point estimate. The radiative emission measurements coupled with the mass loss measurement allowed determination of the radiative fraction, which was equal to 0.22 ± 16 % and 0.20 ± 34 % for the multi-location and single-location measurements, respectively. Flame characteristics, such as, the mean flame height, pulsation frequency and the flame instability near the fuel surface, were analyzed using the 30 Hz video record of the fire. The mean flame height was measured as 1.10 m ± 0.22 m above the burner rim and the puffing frequency was about 1.37 Hz, which was consistent with a Fourier analysis of the transient thermocouple measurements (=1.39 Hz ± 0.013 Hz). The pool surface temperature was measured to be nearly the fuel boiling point.

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Section: Valuementioning

confidence: 80%

“…The results are compared to previous measurements in 30 cm diameter methanol pool fires from Refs. [4,33,34]. Axial distance above the burner is normalized by ̇2 /5 following Baum and McCaffrey [25].…”

Section: Valuementioning

confidence: 99%

The thermal character of a 1 m methanol pool fire

Sung¹,

Chen²,

Bundy³

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…[28] are also shown, where temperature was measured using a 75 μm wire diameter, bare-bead, Type S thermocouple in the steadily burning, NIST, 30.1 cm diameter methanol pool fire with a 0.5 cm lip. The radiation corrected thermocouple measurements in Wang et al [29] are also shown, which used a 50 μm wire diameter, bare-bead, Type S thermocouple in the steadily burning 30.1 cm diameter methanol pool fire with a 1 cm lip height. Sung et al [30] measured temperature in a 100.6 cm diameter methanol pool fire with a lip height of 1 cm using a 50 µm diameter, bare-bead, Type S thermocouple and calculated the corrected gas temperature, considering the radiative loss and thermal inertia effects.…”

Section: Methanol Firementioning

confidence: 90%

“…The measurements are compared to previous measurements in 30 cm diameter methanol pool fires from Refs. [8,28,29] and a 1 m diameter methanol pool fire from Ref. [30].…”

Section: Methanol Firementioning

confidence: 99%

Velocity and temperature structure of medium-scale pool fires

Sung¹,

Falkenstein‐Smith²,

Hamins³

2021

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A series of measurements was conducted using a bidirectional probe to characterize the upward speed in the plumes of medium-scale pool fires burning a variety of gaseous and liquid fuels. Time-averaged local measurements of the upward velocity using a bidirectional probe were conducted in the plumes of methanol, ethanol, and acetone pool fires burning in a 30 cm diameter liquid pool burner and methane and propane gaseous pool fires established on a 37 cm diameter gas burner.

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“…CARS [4] appears to be the most unobtrusive way to measure local gas temperature without modifying the flame; however, the complex experimental setup requires an extensive investment and considerable calibration. Thin-filament pyrometry has also been successfully applied on both a methanol pool fire and a blue whirl [5][6][7]; however, this technique is limited to soot-free flames which don't reflect most practical scenarios. Multi-color optical probes feature simultaneous soot volume fraction and temperature measurements, however only soot, not gas temperature can be detected [8].…”

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confidence: 99%