Compressibility effects in the gas phase for unsteady annular two-phase flow in a microchannel

Document Type

Conference Proceeding

Publication Date

1-1-2006

Abstract

High speed microscopy experiments investigating two-phase (gas-liquid) flow behavior in capillary-scale systems, that is, systems where capillary forces are important relative to gravitational forces, have revealed a unique unsteady annular flow with periodic destabilization of the gas-liquid interface. Standing waves develop on the liquid film and grow into annular lobes similar with those observed in low-speed two-phase flow. The leading face of the lobe will decelerate and suddenly become normal to the wall of the capillary, suggesting the possibility of a shock wave in the gas phase at a downstream location from the minimum gas flow section. Visualization of the naturally occurring convergent-divergent nozzle-like structures as well as a discussion on the possibility of shock wave formation are presented. Copyright © 2006 by ASME.

Publication Title

American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED

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