In this paper the mechanism of density-wave oscillations in a boiling channel with uniform and constant heat flux is analyzed by linear and nonlinear analytical tools. A model developed on the basis of a semi-implicit numerical discretization of governing partial differential equations is used to provide information on the transient distribution of relevant variables along the channel during instabilities. Furthermore, a lumped parameter model and a distributed parameter model developed in previous activities are adopted for independent confirmation of the observed trends. The obtained results are finally put in relation with the picture of the phenomenon proposed in classical descriptions.

Linear and Nonlinear Analysis of Density-Wave Instability Phenomena

AMBROSINI, WALTER;DI MARCO, PAOLO;
2000

Abstract

In this paper the mechanism of density-wave oscillations in a boiling channel with uniform and constant heat flux is analyzed by linear and nonlinear analytical tools. A model developed on the basis of a semi-implicit numerical discretization of governing partial differential equations is used to provide information on the transient distribution of relevant variables along the channel during instabilities. Furthermore, a lumped parameter model and a distributed parameter model developed in previous activities are adopted for independent confirmation of the observed trends. The obtained results are finally put in relation with the picture of the phenomenon proposed in classical descriptions.
Ambrosini, Walter; DI MARCO, Paolo; Ferreri, J. C.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/204455
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