Abstract
Summary Very long slugs reaching several hundreds of pipe diameters may appear when transporting gas and liquid in horizontal pipes. Such slugs may cause serious operational and system failures. One could avoid the long slugs by pulsating the gas phase at the inlet at a specific range of frequencies. The present paper provides a simplified mathematical expression for the optimum gas-pulsation frequency. Predictions of the pulsation frequency for different flow conditions and pipe diameters are presented. Comparisons with available experiments are satisfactory.
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