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Communication Dans Un Congrès Année : 2017

Wave dynamics in counter-current gas-liquid flows for distillation process applications

Résumé

Thin liquid films sheared by a strongly confined counter-current gas flow are common in various engineering applications, such as distillation and absorption for the chemical process industry. These thin films are inherently unstable and the instability produces interfacial waves. These surface waves may strongly alter flow structures within the liquid film as well as the surrounding gas, thus enhancing mass and heat transfers between the two phases. It is known that this enhancement is strongest in the vicinity of critical operating conditions that may cause the system to flood. The aim of the current study is to characterize this flooding regime which occurs when the liquid obstructs the channel cross-section and strongly increases the pressure drop. We employ Direct Numerical Simulation (DNS) by using an in-house two-phase flow solver, where a compressible two-fluid model is implemented alongside a low- Mach scheme. Linear stability of falling films with and without counter-current gas flow is validated against the Orr-Sommerfeld theory. Non-linear wave profiles of vertical falling films are thoroughly compared to experimental data. We also give insights into the origin of the flooding regime in confined two-layer gas-liquid flows by analyzing various flow conditions and channel widths.
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Dates et versions

hal-01905656 , version 1 (26-10-2018)

Identifiants

  • HAL Id : hal-01905656 , version 1

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Gianluca Lavalle, Sophie Mergui, Georg Dietze, Nicolas Grenier. Wave dynamics in counter-current gas-liquid flows for distillation process applications. International workshop on trends in numerical and physical modeling for industrial multiphase flows, Oct 2017, Cachan, France. ⟨hal-01905656⟩
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