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Ecoulements diphasiques liquide-gaz et liquide-liquide dans les microcanaux : Apport de l'analyse d'image

Abstract : This study is divided in two parts : the first one presents a new technique to quantify contact angle and then the wettability. This technique uses a confocal laser scanning microscope (CSLM) and allows to record series of 2-D images of a fluorescent liquid droplets set on various solids surfaces. The building of 3-D images is done with the summation of several images acquired with a regular step along the CSLM z-axis. The results obtained are similar to those obtained with a conventional goniometric technique for different air-liquid-solid systems. The CSLM images shows that drops are characterized by complex morphologies and that the local contact angles can be modified by chemical heterogeneities in the fluids. The second part is mainly an experimental study which deals with liquid-gas and liquid-liquid flows in horizontal microchannels. For each system, the pressures drops are measured and the flow regime maps are realised and compared with those presented in the literature. In the case of liquid-gas flows, the fluid properties have a great impact on the pressure drops and flow patterns. For liquid-liquid flows, two types of experiments are studied: microchannels initially saturated with oil and microchannels initially saturated with water. In the range of the Reynolds numbers considered, a difference in the pressure drops and the flow patterns are observed. The experimental results are interpreted with the homogeneous model and the Lockhart-Martinelli approach.
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Abdelkader Salim. Ecoulements diphasiques liquide-gaz et liquide-liquide dans les microcanaux : Apport de l'analyse d'image. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10006⟩. ⟨tel-01746910⟩

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