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The condensation produced in supersonic expansions of CO2 is studied quantitatively combining Rayleigh and Raman scattering. The cluster number density nc and the mean cluster size <N> are obtained for five expansions with stagnation pressures P0=1-5 bars, and temperature T0=294 K, along axial and radial directions; nc and <N> are determined from the condensation onset up to a terminal size, verifying the empirical law <N>prop.P0^(2.23). A maximum growth rate d<N>/dt approx.8x10(8) s^(-1) is estimated for the 5-bar expansion. The Raman spectra show a coexistence of solid and liquidlike phases in the jet, with a progressive transition from the liquid to the solid fraction as the clusters increase their size.Ministerio de Educación y Ciencia, Proyectos BFM2001-2276 y FIS2004-02576Peer reviewe

physical review a

Quantitative study of cluster growth in free-jet expansions of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>by Rayleigh and Raman scattering

Quantitative study of cluster growth in free-jet expansions ofCO2by Rayleigh and Raman scattering