Abstract
Large vapour supersaturations can arise in narrow diffusive boundary layers with associated large temperature gradients which could occur in a possible nuclear accident. Aerosol produced by homogeneous nucleation will grow and move according to the local phoretic and other forces. For a large evaporating ammonia droplet in air, water vapour diffuses to it and condenses as the droplet becomes colder. Calculations of water vapour supersaturations indicate that the threshold for homogeneous nucleation will be passed. The water droplets formed will then move towards the ammonia droplet if thermophoresis is dominant, but away from the droplet if transport by diffusiophoresis with the outgoing ammonia flux is larger.
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