WebJan 2, 2024 Β· One variable often overlooked is the product itself. A larger particle will take more time to dry, as diffusion will take control so that the falling rate period dominates the curve. But if that same particle is cut into smaller pieces, the drying curve will be totally different, with a longer constant rate period and a shorter falling rate period. WebConstant rate drying period will proceed until free moisture appears from the surface, the moisture removal rate. will then become progressively less. During the constant rate period, the moisture from. interior migrates to the surface by various means and is vapourised. As the moisture content is lowered, the rate of migration to the surface ...
Constant-rate period food technology Britannica
WebIn order to calculate the drying rate during the constant rate drying period, the drying time must be determined. The equation provided by Christie (2003) is used, that is, the time of drying as the material is dried from the initial moisture content X 1 to the final moisture content X 2 in the constant drying rate as: π‘= π β ( 1β 2) WebThe drying rate in the falling-rate period is controlled by the rate of removal of moisture or solvent from the interior of the solid being dried and is referred to as being "mass-transfer limited". This is widely noticed in hygroscopic products such as fruits and vegetables, where drying occurs in the falling rate period with the constant ... εΈγ ηη
DRYING: PRINCIPLES AND THEORY - Centurion University
Web(b) Predict the effect if the gas temperature is raised to 76.7Β°C and H remains the same. (c) Predict the effect on the time t for drying between moisture contents X, to X2 if the β¦ WebConstant rate drying period (B-C) will proceed until free moisture appears from the surface, the moisture removal rate will then become progressively less. At CMC the drying rate ceases and remains constant. During the β¦ WebFeb 2, 2011 Β· This period of drying is followed by one in which the drying rates fell off sharply as moisture content was reduced to the equilibrium value even though the β¦ be first γ°γγΊ γ²γΌγ γ»γ³γΏγΌ