Tendency within the Contour 2a suggests a beneficial linear relationships ranging from ?
Due to technical improves inside heat controllers and running manage process, it has become you can easily to consist of drying heavens heat control steps (nonisothermal drying), where you can realize sinusoidal trend profiles (Shape 1a), square-wave or field means pages (Profile 1b), growing and you will p profiles, saw-tooth trend profiles, and you will trapezoidal wave profiles (Contour 1c), as well as others. Nonisothermal drying out made it you can locate facts out of highest quality and also shorter drying out minutes than those acquired with lingering convective drying ( Chua and others 2002 ). No matter if certain high quality properties was basically examined in the material published to nonisothermal drying, structural functions haven’t been stated, neither provides equations come suggested to describe its conclusion ( Chua although some 2000 ; Chua and others 2002 ). Up to now, zero equations have been proposed to associate changes in the fresh structural qualities from content confronted by changeable additional standards.
It has been observed that there’s zero significant difference ranging from the fresh decisions out-of true occurrence according to X of the information presented throughout the convective drying and you will once are rehydrated to different moisture contents; not, distinctions have been noticed anywhere between obvious occurrence according to the X of the procedure during lyophilization and you may then rehydration to various moisture content material ( Krokida and you may ).
Three possible tendencies of ?p as a function of X have been found (Figure 2), both linear and nonlinear (concave-down and concave-up). p and X, which considers reduction in volume to be equal to the volume of the water eliminated from the material ( Madamba and others 1994 ). Read more
