Die Berechnung des Blasenwachstums beim Verdampfen von Flüssigkeiten an Heizflächen als numerische Lösung der Erhaltungsgleichungen |
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| Authors: | Dr -Ing P Burow Prof Dr -Ing H Beer |
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| Institution: | 1. Battelle-Institut e.V.-Abt. Thermische Verfahrenstechnik, Am R?merhof 35, D-6000, Frankfurt am Main 90
2. Institut für Technische Thermodynamik, Technische Hochschule Darmstadt, Petersenstr. 30, D-6100, Darmstadt
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| Abstract: | A numerical procedure on the basis of the Marker and Cell-method 1] was developed in order to solve the conservation equations for mass, momentum and energy for the case of bubble growth on a heating surface. This procedure was used to calculate steam bubble growth on a horizontal stainless steel heating surface under saturated pool boiling conditions at a system pressure of 1 bar and different superheatings. The essential results obtained are: -Good agreement was found between calculations and experiments concerning bubble growth rates, bubble shape and temperature field in the liquid surrounding the bubble. -During its growth the bubble penetrates the temperature boundary layer formed in the liquid on the heating surface, simultaneously liquid is displaced aside. -The microlayer evaporation fraction of the total bubble growth increases with growth time from 20 % to 50%. |
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