Drying curve • Drying curve is the plot of the drying rate Φ or N versus the remaining water content X. … The rate of removal of the water is also the rate of mass transfer, from the solid to the ambient air. These two – mass and heat transfer – must predict the same rate of drying for a given set of circumstances.
What is drying and explain drying rate curve?
What is drying explain?
Drying is a mass transfer process consisting of the removal of water or another solvent by evaporation from a solid, semi-solid or liquid. This process is often used as a final production step before selling or packaging products. … Desiccation may be synonymous with drying or considered an extreme form of drying.
What is drying curve in food?
Drying curves are generally graphs of the moisture of a food product versus time, or plots of the rate of water removal versus time.
What are the three drying periods on a drying rate curve?
drying rate curve as a function of moisture content (Figure 3) is characterized by three main stages: (1) transient early stage, during which the product is heating up; (2) constant rate period, where the moisture is relatively easy to remove; (3) falling rate period, in which moisture is bound or held within the solid …
What is drying and example?
Drying removes moisture from meat products so that microorganisms cannot grow. Dry sausages, freeze-dried meats, and jerky products are all examples of dried meats capable of being stored at room temperature without rapid spoilage.
What is rate of drying?
Drying rate is the rate at which internal moisture evaporates to the surroundings. It is dependent on the rate at which heat is applied to the product and also the rate at which moist air is removed from the surroundings. Unit can be expressed in kg/h or g/h.
How do you calculate drying rate?
In this case, for the constant-rate period, the time needed to remove the quantity of water which will reduce the food material to the critical moisture content Xc (that corresponding to the end of the constant-rate period and below which the drying rate falls) can be calculated by dividing this quantity of moisture by …
What is the drying rate?
Drying rate is the rate at which internal moisture evaporates to the surroundings. It is dependent on the rate at which heat is applied to the product and also the rate at which moist air is removed from the surroundings. Unit can be expressed in kg/h or g/h.
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.