Transport in porous media (observed by neutron imaging)

Water flow | Water vapor flow | Other fluids | Neutron imaging

Water flow

Fluid transport in heterogeneous multiscale porous media is studied experimentally to elucidate the physics at play and to provide modeling validation datasets.

Porous asphalt, designed to reduce aquaplaning and noise levels in highways, displays a complex systems of very large and very small interconnected pores.

Water uptake in wood presents various wetting patterns, as imaged with neutron radiographs.

Neutron imaging of porous asphalt: dry and wet

states at different saturation degree; black and
white differentials, segmented at 30% saturation.

Capillary uptake

Water vapor flow

Forced convective drying of fruit is analyzed non-destructively with neutron imaging to analyze the drying rate, evolution of shrinkage and moisture content distribution.

Moisture distribution in apple blocks during drying.

Raw neutron radiographs of apple slices, with

and without peel, before and after drying

Other fluids

We investigate plant sap flow and transpiration with perspectives towards studying plant response to environmental conditions and plant water stress.

Sections and front view of 3D relative moisture content in apple leaf

Neutron imaging

We use neutron imaging to study porous materials and their interactions with fluids. Neutron imaging provides high resolution in moisture content, space and time. We aim at understanding the physics of transport processes, determining material properties and validating computer models.

We have developed several experimental methods to study mass transport under different boundary conditions. Neutron images are acquired at the Neutra and Icon beamlines, SINQ, PSI.

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