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- W2070409185 abstract "We used a tunable diode laser absorption spectrometer and a static-pressure probe to follow changes in temperature, vapor-phase concentration of D2O, and static pressure during condensation in a supersonic nozzle. Using the measured static-pressure ratio p∕p0 and the mass fraction of the condensate g as inputs to the diabatic flow equations, we determined the area ratio (A∕A*)Wet and the corresponding centerline temperature of the flow during condensation. From (A∕A*)Wet we determined the boundary-layer displacement thickness during condensation (δ#)Wet. We found that (δ#)Wet first increases relative to the value of δ# in a dry expansion (δ#)Dry before becoming distinctly smaller than (δ#)Dry downstream of the condensation region. After correcting the temperature gradient across the boundary layers, the temperature determined from p∕p0 and g agreed with the temperature determined by the laser-absorption measurements within our experimental error (±2 K), except when condensation occurred too close to the throat. The agreement between the two temperature measurements let us draw the following two conclusions. First, the differences in the temperature and mole fraction of D2O determined by the two experimental techniques, first observed in our previous study [P. Paci, Y. Zvinevich, S. Tanimura, B. E. Wyslouzil, M. Zahniser, J. Shorter, D. Nelson, and B. McManus, J. Chem. Phys. 121, 9964 (2004)], can be explained sufficiently by changes in δ# caused by the condensation of D2O, except when the phase transition occurs too close to the throat. Second, the extrapolation of the equation, which expresses the temperature dependence of the heat of vaporization of bulk D2O liquid, is a good estimate of the heat of condensation of supercooled D2O down to 210 K." @default.
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- W2070409185 date "2005-05-15" @default.
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- W2070409185 title "Temperature and gas-phase composition measurements in supersonic flows using tunable diode laser absorption spectroscopy: The effect of condensation on the boundary-layer thickness" @default.
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- W2070409185 doi "https://doi.org/10.1063/1.1900084" @default.
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