Laboratoire de Physique des Solides - UMR 8502

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Convective evaporation of vertical films

We just published a paper in Soft Matter on the convective evaporation of vertical films.

Motivated by the evaporation of soap films, which has a significant effect on their lifetime, we performed an experimental study on the evaporation of vertical surfaces with model systems based on hydrogels. From the analogy between heat and mass transfer, we adopt a model describing the natural convection in the gas phase due to a density contrast between dry and saturated air. Our measurements show a good agreement with this model, both in terms of scaling law with the Grashof number and in terms of order of magnitude. We discuss the corrections to take into account, notably the contribution of edge effects, which have a small but visible contribution when lateral and bottom surface areas are not negligible compared to the main evaporating surface area.

Now, we are working on the evaporation of vertical films, which is more challenging and is promising.

Our article is available freely on arxiv and on the editor’s website