Speaker
Description
We investigate evaporation in heterogenous porous media via microfluidic experiments and simulations. In a single column filled with a volatile liquid and exposed to air, vapour transport to the column exit will be diffusively limited, and the liquid height and hence evaporation rate will decrease as the square root of time. When multiple columns or channels of different diameters are linked, capillary effects can lead to fluid transport towards or away from the drying front, and hence the net drying rate is no longer strictly diffusively limited. In this case, the differences in size and shape of the channels, as in heterogeneous porous media, can have a significant influence on the net evaporation rate. We construct a variety of model 2D porous media with varying grain shapes and sizes via soft lithography and study their drying behaviour using a combination of theory and simulation.
| Country | Switzerland |
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