A theoretical basis for the Lockhart-Martinelli correlation for two-phase flow

Two-fluid model and hydrodynamic constitutive relations

Prediction of pressure drop during forced circulation boiling of water

Liquid velocity distribution in two-phase bubble flow

Momentum and heat transfer in two-phase bubble flow—I. Theory

Theoreticai equations governing slip effects in forced circulation oi boiling water are derived. The equations indicate that steam slip is dependent upon channel geometry, inlet water velocity, and rate of heat addition. A simplified momentam model is postulated which leads to equal friction and head losses of two phases. The model gives good agreement with available experimental results in horizontal and vertical test sections with and without heat addition at pressures from 12 to 2000 psia. Discussion of the model in terms of nonquasi steady-state unbalances of friction and head losses of the two phases explains experimental deviations from the predictions and the previously noted effects of water inlet velocity. It also gives trends for the effects of channel geometry and rate of heat addition. application of the simplified model to calculating two- phase pressure drops is included. (auth)

Steam Slip—Theoretical Prediction From Momentum Model

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Prediction of Two-Phase Critical Flow Rate

Prediction of Two-Phase Pressure Drop and Density Distribution From Mixing Length Theory

Generalized Correlation of Boiling Heat Transfer

ABS>Heat-transfcr coefficients are presented for water flowing vcrtieally in thin rectangular channels (0.1 x 2.5 in.) 18 and 36 in. long and heated electrically around the entire periphery. Thc range of variables covered is: 65 to 200 psia pressures 90 to 200 F subcoolings and 4 to 50 fps water velocity. Heat-transfer correlations are given for data along the narrow and wide faces of the rectangular test section. Burnout data also are reported with steam blanketing occurring first at the corner of the test section. The proposed correlating equations valid at the narrow face of the test sections gives values considerably lower than those obtained in a circular pipe. (auth)

S. Levy

Papers

Steam Slip—Theoretical Prediction From Momentum Model

Prediction of Two-Phase Critical Flow Rate

Prediction of Two-Phase Pressure Drop and Density Distribution From Mixing Length Theory

Generalized Correlation of Boiling Heat Transfer

Heat transfer to water in thin rectangular channels