Laboratoire de Mécanique des Fluides et d'Acoustique - UMR 5509

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Accueil > Équipes > Fluides Complexes et Transferts > Séminaires du groupe > Archives (2016)

le 7 juillet 2016 - Vatsal SANJAY
On the air entrainment in a water pool by impingement of jet

13h@Salle I11-1 (RDC), ECL (Écully)

 le 7 juillet 2016 - Vatsal SANJAY On the air entrainment in a water pool by impingement of jet

Central to several widely encountered phenomenon in nature is the process of bubble entrainment in a liquid pool as a plunging jet impinges on-to its surface. A look around reveals the presence of this phenomenon in daily chores ranging from filling of a glass of water using tap to several chemical reactions, such as mineral flotation, steel teeming process and gas absorption. Our work involves the experimental and numerical investigation of the this phenomenon. Possible outcomes due to jet impingement in a pool have been identified as smooth free surface without entrainment or formation of rigorous bubble cluster below the jet-pool contact. Triangular entrained region is found to be a three dimensional association of disconnected bubble population continuously breaking and making with neighbors. Using high-speed imaging, the initiation of the entrainment phenomenon as well as temporal and spatial variations of the bubble population are established. A correlation for prediction of maximum entrained height for a range of jet diameters and lengths is proposed. During entrainment, free surface of the pool shows undulations which subsequently releases droplets of different sizes around the jet. Along side, a conductivity probe has also been used to examine the probabilistic presence of bubble at a given height in the liquid pool.

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Vatsal SANJAY est un stagiaire du LMFA/LEGI @UCBL jusqu’au 15 juillet 2016
Responsables de stage : Jean-Philippe MATAS, Mickael BOURGOIN (ENS) & J. John Soundar Jerome