Drying
Drying is the mass transfer process consisting of a removal of water or another solvent by evaporation from a solid, semi-solid or liquid. This process is often used as aproduction step previously selling or packaging products. To be considered "dried", theproduct must be solid, in the cause of a continual sheet e.g., paper, long pieces e.g., wood, particles e.g., cereal grains or corn flakes or powder e.g., sand, salt, washing powder, milk powder. A ingredient of acknowledgment of heat in addition to an agent to remove the vapor exposed by the process are often involved. In bioproducts like food, grains, in addition to pharmaceuticals like vaccines, the solvent to be removed is near invariably water. Desiccation may be synonymous with drying or considered an extreme defecate of drying.
In the near common case, a gas stream, e.g., air, applies the heat by convection and carries away the vapor as humidity. Other possibilities are vacuum drying, where heat is supplied by conduction or radiation or microwaves, while the vapor thus presentation is removed by the vacuum system. Another indirect technique is drum drying used, for instance, for manufacturing potato flakes, where a heated surface is used to administer the energy, and aspirators draw the vapor external the room. In contrast, the mechanical extraction of the solvent, e.g., water, by filtration or centrifugation, is not considered "drying" but rather "draining".