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International Journal of Energetic Materials and Chemical Propulsion
MASS TRANSFER EFFECTS ON SOUND PROPAGATION IN A DROPLET-GAS MIXTURE
Fundamental and Applied Energetics Department, Office National d'Etudes et de Recherches Aérospatiales (ONERA), B.P. 72, 92322 Châtillon Cedex France
The effect of mass transfer on the propagation of a plane acoustic wave in a stagnant two-phase medium is studied theoretically using a continuum formulation. It is shown that a diffusion-controlled mass transfer process can be a driving mechanism for acoustic-related oscillations if the undisturbed gas temperature is higher than the saturation temperature of the liquid. On the other hand, if the undisturbed gas-droplet mixture is at a saturated state, mass transfer is a damping phenomenon as velocity and thermal lags between the gas and the droplets. Besides, with the model used, the effect of mass transfer becomes significant and dominates the other exchange processes at low frequencies and/or for small diameters. However, these results must be taken with caution since the mass exchange term follows a quasi-steady law.
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