Convective hot-air drying, by entrainment
Drying: principles and equipment calculation

The product is characterized by its geometry (characteristic dimension L, exchange surface S for its mass m), by its average water content $\overline{X}$ (kg water/kg DM) and by its temperature θ_P (of which θ_Ps on the surface). It is placed in warm air A characterized by its temperature (θ _a > θ_Ps), its relative humidity ϕ_a assumed to be low, and its relative velocity v_a (m/s) with respect to the product. The partial pressure of water vapour in air pp_a (Pa) will also be used.

Drying results from coupled exchanges of heat (enthalpy) and matter...