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(Color online) Typical steam plasma torches operating inside a quartz tube with diameter and length. The torches are powered by 1, 2, and .
Measured data of the flame temperature vs the axial distance from the center for the plasma flame at . The temperature of the torch flame was measured by making use of a thermocouple device and optical spectroscopy .
Plots of the normalized light intensity of the OH radicals at vs the gas temperature in kelvins. The light intensity is normalized by that at the temperature . The solid line is the theoretical prediction obtained from with Eq. (2) at , and the dots represent the measured data.
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