Objetivo A mathematical model is to be developed which gives the possibility to predict liquid/liquid coalescence phenomena in turbulent pipes. The validity of the model is to be tested with an experimental program.The drop size evolution along a pipe of an oil in water dispersion has been described by mean of a numerical simulation based on resolution of the drop population balance equation.Predictions given by the model are that significant coalescence phenomena can take place along industrial pipes which are a few kilometers long.Tests that have been carried out have confirmed that under standard pipe flow conditions, coalescence phenomena are very slow.Drop size increase observed during the tests were slightly higher than expected from mathematical model.This difference empharised the need :- to settle a new expression for the collision rate that would be better adapted to the description of intermediate drop collision,- to settle an experimental method to determine the collision efficiency of a given dispersion,An other result of these tests is that further tests should be carried out with a longer test pipe, 1 km long at least.A light beam attenuation probe adapted to liquid/liquid interfacial area measurement has been developed that could be used for industrial application.A bibliographic study has been carried out on turbulent dispersions and collisions probability on one hand and on coalescence and drop breakup mechanisms on the other hand.Then a numerical model has been developed to predict the drop size evolution of an oil in water dispersion along a pipe. According to the results given by this model, a 100 m long 2" test pipe has been set on a special rig.A calibrated oil in water dispersion generation device has been designed and various types of drop size measurement methods have been tested and evaluated.Finally a light beam attenuation probe adapted to liquid/liquid interfacial area measurement has been developed and used during the experiment program.Tests have been carried out to determine drop size evolution along the pipe under various flow rate conditions and experimental results compared to theoretical predictions. Programa(s) ENG-HYDROCARB 1C - Programme (EEC) of Community projects in the hydrocarbons sector, 1973-1985 Tema(s) 1.6 - MISCELLANEOUS Convocatoria de propuestas Data not available Régimen de financiación DEM - Demonstration contracts Coordinador Alsthom Neyrtec Aportación de la UE Sin datos Dirección 2 avenue du Général de Gaulle 38800 Pont de Claix Francia Ver en el mapa Coste total Sin datos
