Quantitative study of cluster growth in free-jet expansions of CO{sub 2} by Rayleigh and Raman scattering
- Instituto de Estructura de la Materia, CSIC, Serrano 121, 28006 Madrid (Spain)
The condensation produced in supersonic expansions of CO{sub 2} is studied quantitatively combining Rayleigh and Raman scattering. The cluster number density n{sub c} and the mean cluster size N are obtained for five expansions with stagnation pressures P{sub 0}=1-5 bars, and temperature T{sub 0}=294 K, along axial and radial directions; n{sub c} and N are determined from the condensation onset up to a terminal size N{sub {infinity}}, verifying the empirical law N{sub {infinity}}{proportional_to}P{sub 0}{sup 2.23}. A maximum growth rate dN/dt{approx_equal}8x10{sup 8} s{sup -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.
- OSTI ID:
- 20786528
- Journal Information:
- Physical Review. A, Vol. 72, Issue 5; Other Information: DOI: 10.1103/PhysRevA.72.053204; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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