Abstract
The nonlinear dynamics of two-phase flow advances our understanding of limit-cycle phenomena and informs the control of fluid oscillation. Here, we introduce nonlinear fluid dynamics of a high-temperature steam jet as a class of two-phase flow with steam-liquid coupling. Transition of steam plume from continuous expansion to rupture contraction is revealed as a nonequilibrium symmetry-breaking phenomena in high-frequency fluid oscillation. We establish a versatile platform of high-temperature steam jet to explore self-sustained two-phase flow oscillator dynamics. A generalized nonlinear steam-liquid coupled dynamic model derived from isentropic flow, the unsteady Bernoulli equation and interface mechanics gives theoretical predictions and serves as rationale for our experimental observations. Our theory about the oscillation mechanism and propagation law of the steam-liquid flow of high-temperature steam jets points toward exciting directions for future research, from understanding hydrovolcanic eruption to propagation and control of high-temperature condensation.
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