
handle: 2268/314835 , 2268/102845
In this thesis, we discuss some physical phenomena related to the manipulation of droplets, and their possible use as alternatives for digitalmicrofluidics. In a first part, the behavior of droplets in the vicinity of another liquid interface is explored. We have shown that dropletscan be kept bouncing onto a liquid interface, provided this latter is vertically vibrated. The bouncing mechanisms are investigated in severalconfigurations. Bouncing droplets may also experience self-propulsion and partial coalescence. The second part of this thesis is dedicated tothe study of droplets sliding down fibers. The basic microfluidic operations are advantageously implemented with simple fiber networks.Dans cette thèse, nous discutons plusieurs phénomènes physiques liés à la manipulation des gouttes et à leur application possible en tempsqu'alternatives à la microfluidique digitale actuelle. La première partie est consacrée au comportement de gouttes au voisinage d'une autreinterface liquide. Nous avons prouvé qu'une goutte peut rebondir indéfiniment sur une interface liquide vibrée verticalement. Les mécanismes durebond sont analysés en détail pour plusieurs configurations. Sous certaines conditions, les gouttes rebondissantes peuvent égalements'auto-propulser ou coalescer partiellement. Dans une seconde partie, nous étudions le glissement des gouttes sur des fibres. Les opérationsmicrofluidiques de base sont avantageusement réalisées sur de simples réseaux de fibres.
Physical, chemical, mathematical & earth Sciences, Physique, fluid mechanics, Physics, Physique, chimie, mathématiques & sciences de la terre, microfluidics, droplet, microfluidique, goutte, dynamique des fluides
Physical, chemical, mathematical & earth Sciences, Physique, fluid mechanics, Physics, Physique, chimie, mathématiques & sciences de la terre, microfluidics, droplet, microfluidique, goutte, dynamique des fluides
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