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Bubble nucleation cavities, effect

A theoretical model for the heterogeneous nucleation was proposed by Hsu [10] for the growth of pre-existing nuclei in a cavity on a heated surface. The model included the effect of nmi-uniform superheated liquid. The equation for the activation curve of bubble nucleation was derived by combining the Clausius-Qapeyron and the Young—Laplace equations. Then, by substituting the linear temperature profile into the equation, the range of active cavity sizes on the heated surface was obtained. [Pg.583]

Shear enhancement effects in foam formation can be understood through the modified cavity model. Shear force behaves as catalyst to reduce energy barrier to allow a quik path from stable gas cavity to unstable bubble phase. It can be concluded that both shear rate and viscosity contribute to foam nucleation in the continuous foam extrusion process. Therefore, proper die opening and process conditions will help to optimise the foam product. 11 refs. [Pg.106]

See other pages where Bubble nucleation cavities, effect is mentioned: [Pg.286]    [Pg.283]    [Pg.50]    [Pg.219]    [Pg.220]    [Pg.526]    [Pg.161]    [Pg.162]    [Pg.519]    [Pg.2605]    [Pg.483]    [Pg.379]    [Pg.40]    [Pg.44]    [Pg.152]    [Pg.173]    [Pg.224]    [Pg.211]    [Pg.262]    [Pg.791]    [Pg.1001]    [Pg.483]    [Pg.325]    [Pg.218]    [Pg.536]    [Pg.87]    [Pg.3]    [Pg.529]    [Pg.310]   
See also in sourсe #XX -- [ Pg.528 , Pg.529 ]



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