Theory of drying Drying involves both heat & mass transfer operations. … Heat must be supplied to provide latent heat of vaporisation. ii. The liberated vapour must be removed by moving an air steam.Dec 29, 2017
What is the theory of drying?
What are the theories and principles in drying?
The IICRC has found that there are four principles to properly drying a structure: removal of standing water, evaporation through air movement, dehumidification and temperature control.
What is the process of drying?
Drying is a mass transfer process consisting of the removal of water or another solvent by evaporation from a solid, semi-solid or liquid. … A source of heat and an agent to remove the vapor produced by the process are often involved.
What is diffusion theory of drying?
The diffusion of moisture is most important phenomenon in drying. The drying is mainly. A multiphase process –phase change, evaporation happens under non –equilibrium conditions, thermodynamically difficult to define interfacial properties (thermodynamics equilibrium) and.
What is the principle of drying food?
The principle behind drying is that sufficient moisture is removed, which is essential for growth of microorganisms and for enzyme activity. Removal of moisture increases the storage life of the product due to reduced water activity.
What is the difference between drying and evaporation?
Drying, or dehydration, is used to remove relatively large amounts of water from foods, and is accomplished by imposing a difference in water activity between the food and its surroundings. Evaporation is used to concentrate liquid foods, as water in the food reaches the boiling point and escapes into the surroundings.
What is the difference between drying and dehydration?
Drying is the process of removal of solvent from a solid, semi-solid or a liquid whereas dehydration is the removal of water from the water-containing compound. Therefore, this is the fundamental difference between drying and dehydration.
What is the purpose of drying?
The purpose of drying is to retain the physico-chemical properties of materials, to ensure, in many cases, the preservation of materials over prolonged periods, and to eliminate excess weight in shipping.
What are the two types of drying?
Basically, drying can be done by two processes viz. natural drying and mechanical dehydration or artificial drying based on source of energy.