Moisture Migration and Diffusion

Drying requires internal water movement and surface evaporation. Faster evaporation does not guarantee faster complete drying when the centre cannot replenish the surface at the same rate.

Water moves in response to chemical-potential and moisture gradients that are commonly interpreted through water activity, concentration and temperature. The effective driving force changes as the product dries.

Geometry, distance to the surface, muscle structure, fat distribution, pH, salt, temperature, shrinkage and protein state influence effective diffusion. Published coefficients are therefore product- and method-dependent.

Meat drying commonly becomes controlled by internal transport as readily available surface water disappears. The drying rate falls while water from deeper regions travels through an increasingly dry structure.

Low humidity or excessive surface air speed can remove water faster than the interior supplies it. A dry outer zone then increases resistance and may trap a softer, higher-water-activity centre.

Weight curves, representative core and surface measurements, water activity, geometry and chamber data help interpret migration. Weight loss alone cannot prove uniform moisture distribution or a validated release state.