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Accueil du site > Séminaires > Séminaires 2022 > MSC Seminar. May 23th 2022 at 11:30. Nicolas Rimbert (Lemta, Université de Lorraine) : " Experimental Study of Liquid-liquid jet fragmentation : Eulerian and Lagrangian approach"..

MSC Seminar. May 23th 2022 at 11:30. Nicolas Rimbert (Lemta, Université de Lorraine) : " Experimental Study of Liquid-liquid jet fragmentation : Eulerian and Lagrangian approach".

Sauf mention contraire, les séminaires et les soutenances se déroulent à 11h30 en salle 454A du bâtiment Condorcet.


There will be a live diffusion with Zoom.

Monday May 23th, 11h30

Contact Michael Berhanu to attend the visio-seminar.

Experimental Study of Liquid-liquid jet fragmentation : Eulerian and Lagrangian approach

Nicolas Rimbert, LEMTA, CNRS Université de Lorraine, Vandœuvre-lès-Nancy

Abstract : In order to understand fundamentals of liquid-liquid jet breakup, a jet of Cargille laser fluid (density 1896 kg/m³, viscosity 26 mPa.s, surface tension to water 0.0265 N/m) injected into a water pool is studied. The Cargille fluid has been purchased so that it matches water refractive index at 20°C (n = 1.3330). A laser sheet (532nm wavelength) is then used and Pyrromethene 597 is used as fluorescent dye to trace Cargille fluid location otherwise undistinguishable from water. A high-speed camera (phantom V710) is used to record the experiments. Data (cf. figure 1) are then processed using a Lagrangian tracking algorithm (based on Kalman filtering) showing the birthplace of elementary droplet related to primary fragmentation of the jet. The postprocessing also allows to put secondary fragmentation and collision into evidence when they happen inside the light sheet. To understand the size of the droplet produced by primary fragmentation, an Eulerian dynamic mode decomposition algorithm is used to study instabilities that are localized in the near nozzle area (see red box on figure 2) of the jet. Results shows that for resolved droplet, instability wavelength correlates with the size of the droplets and that Entov-Yarin (longwave) bending instability plays an important role albeit most classical instability modes (Sterling-Sleicher, Lin & Reitz, Rayleigh...etc.) seem to be present.

Figures 1 : High speed footage of the experiment. Lagrangian tracking of the droplet

Figures 2 : High speed footage of the experiment. Zone where the DMD analysis is located


Contact : Équipe séminaires / Seminar team - Published on / Publié le 17 mai


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