The analysis of nonlinear density-wave oscillations in boiling channels.

*(English)*Zbl 0585.76064Summary: Thermally induced flow instabilities in uniformly heated boiling channels have been studied analytically. The classical homogeneous equilibrium model was used. This distributed model was transformed into an integrodifferential equation for inlet velocity. A linear analysis showed interesting features (i.e. islands of instability) of the marginal stability boundary which appear when the effects of gravity and friction were systematically considered. A quasilinear Hopf-bifurcation analysis, valid near the marginal-stability boundaries, gives the amplitude and frequency of limit-cycle oscillations that can appear on the unstable side of the boundary. The analysis also shows cases where a finite- amplitude perturbation can cause a divergent instability on the stable side of the linear-stability boundary.

##### Keywords:

Thermally induced flow instabilities; uniformly heated boiling channels; classical homogeneous equilibrium model; integrodifferential equation for inlet velocity; islands of instability; marginal stability boundary; quasilinear Hopf-bifurcation analysis; limit-cycle oscillations; finite- amplitude perturbation; divergent instability; linear-stability boundary
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\textit{J.-L. Achard} et al., J. Fluid Mech. 155, 213--232 (1985; Zbl 0585.76064)

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##### References:

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[7] | DOI: 10.1017/S0022112081003509 · Zbl 0493.76024 |

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