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Hydrodynamics and Mass Transfer on a Moving Drop of Water

by Bernard Caussade, CNRS, Toulouse, France,
Abdellah Saboni, CNRS, Toulouse, France,



Document Type: Proceeding Paper

Part of: Water Quality Issues at Fossil Fuel Plants

Abstract:

The fluid dynamics and mass transfer associated with moving water drops are examined. In the first part, numerical solution of the transient hydrodynamics around and inside a drop falling from rest, under the influence of gravity, is obtained for intermediate Reynolds numbers (Re=O (100)). The formulation entails a simultaneous solution of the Navier-Stokes equations inside and outside the drop and the particle equation. In the second part, using numerical flow fields, a convective-diffusion equation is solved numerically to determine the uptake and desorption of toxic gases (CO₂/SO₂) by raindrops at terminal velocity. The predicted flow field and concentration profiles within the drop exhibit (graphically) the physical phenomena involved in the mass transport.

Subject Headings: Hydrodynamics | Navier-Stokes equations | Mass transfer | Fluid dynamics | Numerical methods | Mass transport | Fluid flow

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