Springer Online Journal Archives 1860-2000
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Summary While the theory concerning critical discharges of single-phase flow, in particular of gases, is well known, the direct opposite is true for two-phase mixtures. The question still remains to be answered whether critical flow occurs for two-phase flow with the same implications that it carries for single-phase flow. A theoretical analysis, which is supported by experimental data, is presented in this paper and indicates that the implications for single-phase and two-phase critical flow differ significantly. While single-phase flow is restricted by so-called sonic choking, the extra freedom available in a two-phase flow system, the slip ratio, restricts the maximum flow in the latter. Furthermore, two-phase critical flow is achieved when the slip ratio takes on a value such that the rate of momentum gain by convection per unit volume becomes identical in each fluid phase.
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