Abstract
Unacceptable anomalous upstream choking conditions are shown to occur at low qualities when using the most commonly applied engineering model for computing two-phase (liquid-vapor) pressure drop. The direct relation between this condition and the mathematical prediction of a maximum value of the critical mass velocity in regions where quality approaches zero, is noted. Although computations for vapor-liquid sodium flows are emphasized, it is noted that similar difficulties will also exist with water flows. Upstream choking is shown to result from use of four different representations of the Lockheart-Martinelli vapor volume fraction correlation as well as from three other void correlations, two of which are specifically suggested for application to liquid metals.
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