Optimisation d'échangeurs à films ruisselants

Abstract : We consider the heat transfer across a thin liquid film flowing by gravity along an tilted plane. This work aims at the identification of the mechanisms of heat transfer intensification and the optimization of the geometry of a plate exchanger. A simplified model based on weighted residual integral method applied to Navier Stokes and Fourier equations has been developed. A tool for solving system of partial derivative equations using the method of line has also been written. Spatial discretization is dealt with finite differences. A high order implicit Runge Kutta scheme with an adaptative time stepping, allows a stable and efficient resolution. This simplified model allowed us to link the fluid’s dynamics (and especially the presence of recir- culations under traveling wave crests, alos called roll waves) with transfer intensification. This link has been confirmed solving the primitive equations . Indeed, a parametric study of the transfer inten- sification on a signature/representative element of an exchanger plate by a monochromatic frequency has been conducted showing that transfer intensification is related to the onset of roll waves. The effect of a variable wall goemetry has been included to the model. Preliminary work points out the need for a low inclination to yield a significant effect on transfer intensification.
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https://hal.archives-ouvertes.fr/tel-01822445
Contributor : Nicolas Cellier <>
Submitted on : Monday, June 25, 2018 - 10:19:41 AM
Last modification on : Thursday, May 16, 2019 - 1:30:21 AM
Long-term archiving on : Wednesday, September 26, 2018 - 1:23:03 PM

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Nicolas Cellier. Optimisation d'échangeurs à films ruisselants. Génie des procédés. Université de Savoie, 2018. Français. ⟨tel-01822445v1⟩

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