Dissertation/ Thesis
Dynamics of a 2D droplet in Hele-Shaw cell ; Dynamique d'une goutte 2D dans une cellule de Hele-Shaw
| العنوان: | Dynamics of a 2D droplet in Hele-Shaw cell ; Dynamique d'une goutte 2D dans une cellule de Hele-Shaw |
|---|---|
| المؤلفون: | Reichert, Benjamin |
| المساهمون: | Gulliver (UMR 7083), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres, Marie-Caroline Jullien |
| المصدر: | https://pastel.hal.science/tel-02365250 ; Mécanique [physics]. Université Paris sciences et lettres, 2017. Français. ⟨NNT : 2017PSLET028⟩. |
| بيانات النشر: | HAL CCSD |
| سنة النشر: | 2017 |
| المجموعة: | ESPCI ParisTech: HAL (Ecole Supérieure de Physique et Chimie Industrielles) |
| مصطلحات موضوعية: | Droplet, Hele-Shaw cell, Lubrication film, Interface, Goutte, Cellule de Hele-Shaw, Film de lubrification, [PHYS.MECA]Physics [physics]/Mechanics [physics] |
| الوصف: | Droplet microfluidics is a growing field of research. However, the dynamics of these objects remain misunderstood. Indeed, a question as fundamental as predicting the droplet velocity while pushed by an external fluid at a given velocity is still not answered. Understanding the dynamics of a droplet requires to characterize the viscous dissipation mechanisms (friction) within the droplet and in the lubrication film. This dissipation is related to the shape and to the physicochemical properties of the interface separating the inner phase of the droplet from the outer phase. This thesis presents a characterization of the dynamics of 2D droplets in a Hele-Shaw cell, by taking advantage of the double measurement of the lubrication film by interference microscopy and of the droplet velocity. Firstly, we study experimentally the influence of the droplet viscosity and surfactant concentration on the shape of the interface. The comparison between the topographies measured experimentally with the theoretical models already existing and the new one developed in this thesis, reveals that the use of a purely hydrodynamical approach in order to derive the theoretical topography only allows to recover the experimental topography if the system is surfactant free or if the droplet viscosity is high enough to overcome the Marangoni effect at the interface. In the other cases, the shape of the interface depends on the Marangoni stress exerted either locally or globally at the interface of the droplet. In a second part, the derivation of a theoretical model for the droplet velocity, based on the modeling of the lubrication film topographies measured experimentally, allows to recover quantitatively, and without any fitting parameter, the experimental data on droplet velocities. ; La microfluidique à goutte a connu un essor remarquable ces dix dernières années. Pourtant, la dynamique de ces objets reste largement inexplorée et incomprise. En effet, une question aussi fondamentale que de prédire la vitesse d'une goutte poussée par ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | French |
| Relation: | NNT: 2017PSLET028; tel-02365250; https://pastel.hal.science/tel-02365250; https://pastel.hal.science/tel-02365250/document; https://pastel.hal.science/tel-02365250/file/ESPCIBenjaminReichert2017.pdf |
| الاتاحة: | https://pastel.hal.science/tel-02365250 https://pastel.hal.science/tel-02365250/document https://pastel.hal.science/tel-02365250/file/ESPCIBenjaminReichert2017.pdf |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.32704C62 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |