Chapter 14
Flow Stability at Near-Critical and Supercritical Pressures


For near-critical and supercritical pressures single-phase heat transfer, as well as for subcritical pressures two-phase heat transfer, flow oscillations can occur. These flow oscillations can significantly narrow the region with stable flow and affect heat transfer and reliability of heat-transfer equipment.

For two-phase flows at subcritical pressures, the appearance of flow pulsations and thermo-acoustic oscillations are described in book by Gerliga and Scalozubov (1992). Also, Rohatgi and Duffey (1998) using homogenous equilibrium theory obtained a close-form solution for the stability region for parallel channels and derived the critical subcooling number, which is the lowest for unstable flow. Some conclusions from these two sources can be applicable for supercritical flows.

Papers related to flow instability at supercritical pressures are listed below in the chronological order.

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