This experimental and theoretical study of light scattering techniques addresses the questions of deconvolution of light scattering data (phase functions and optical resonance spectra) from droplets and the uniqueness of that deconvolution for the measurement of size and refractive index of microspheres. Theory and experiment are compared for single component and multicomponent microdroplets and for layered microspheres levitated in electrodynamic balances. Size changes of the order of 1 A have been measured by tracking resonance shifts of slowly evaporating single component droplets. For multicomponent droplet evaporation, which involves simultaneous size and refractive index changes, and for rapid evaporation, precision is reduced to approximately 1 part in 10(4) for each parameter.

Symbols A area per molecule (Á2) a damping constant (mm'1) wavelength (mm) e surface dilatational elasticity (mN/m) k wave number (mm-1) j;s viscosity of the solution (mP) f amplitude of the transverse mode 7r surface pressure (mN/ m) p density of the solution (kg m~3 45) a absolute surface tension (mN/m) T temperature angular frequency (s_1)Registry No. PVA,

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EDF is involved with CEA and AREVA in a common effort for the development of the future nuclear reactor generations. The studies, currently performed by the partners, concentrate on the design of Sodium Fast Reactor types that may include different kinds of innovative circuits and components as compared to the SPX (Super PheniX) plant design. Based on previous knowledge on SG developed at EDF, with Sodium as hot fluid, and with the help of more recent methods of modeling using the Modelica libraries, a new model for the simulation of steam generator has been developed in order to help the designers of the heat exchangers to meet the requirements for a Sodium Fast Reactor plant design. The paper will present the current status of the model and a comparison of the results with those of the actual SuperPhenix steam generator database.

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