Study of Density Wave Phenomena in Boiling and Condensing Two-Phase Flow Systems
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
E3-1 Instabilities and Nonlinear Dynamics

Leonardo Ruspini (Norwegian University of Science and Technology)
Carlos Dorao (Norwegian University of Science and Technology)
Maria Fernandino (Norwegian University of Science and Technology)


In this work density wave oscillations are studied. This phenomenon have been widely studied for boiling systems with sub-cooled inlet condition in the past. The main purpose of this work is to characterize the stability region of boiling and condensing systems for sub-cooled and saturated inlet conditions. Stabilitymaps, based on the sub-cooling and the phase-change numbers, are constructed. The limits of the unstable regions are identified and characterized. Finally some numerical simulations are presented in order to describe the nature of the involved phenomena. A high-order numerical solver, based on a homogenous two-phase model for a single boiling channel is implemented.

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