Abstract
A new model of heterogeneous nucleation at walls during flashing and boiling is presented. The model is based on a new method for computation of the bubble departure diameter in flows, accounting for mutual bubble interactions and the limitation of the bubble production due to the limited amount of energy supplied into the boundary layer by turbulence induced by bubble growth and departure. In addition, measurements of the active nucleation site density as a function of contact angle and superheating and a theory of bubble growth are used to obtain a complete description. The final model together with fragmentation and coalescence models is incorporated into the system code IVA 4 and verified by comparison with data for flashing flows in converging-diverging nozzles and pipe blow-down of water.
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