Isotherms drying

A wet steam at a pressure of 5.0 bar with a quality of 0.85 is isothermally dried" by evaporating the entrained liquid. The flow rate of the dried steam is 52.5 m /h. 

Thijssen and Coumans, Short-cut Calculation of Non-isothermal Drying Rates of Shrinking and Non-shrinking Particles Containing an Expanding Gas Phase, Proc. 4th Int. Drying Symp., IDS 84, Kyoto, Japan, 1 22-30 (1984). Van der Lijn, doctoral thesis, Wageningen, 1976. 

Figure 2 Isothermal drying profiles of Ficoll glass film of 0.08-mm thickness, where F is defined as the fractional extent of drying, the mass of water removed at time t, divided by the initial water content. Thus F = 1 corresponds to the initial water content, 8.87% in this case. Redrawn, with alterations, from ref. 119...

FIGURE 32.7 Schematic representation of isothermal drying cnrve for the selection of encapsnlating materials for spray-dried microcapsnles (Matsuno and Adachi method). Type 1 curve corresponds to materials that form fine, dense, two-dimensional skins immediate upon drying. Types 2, 3, and 4 curves correspond to materials that do not form dense skins at an early stage of drying. (From Perez-Alonso, C. et al., Carbohydr. Polym., 53, 197, 2003. With permission.)... 

FIGURE 3.13 Solution of the DPM isothermal drying model of one-dimensional plate by pdepe solver of MATLAB . Finite difference discretization by uniform mesh both for space and time, 5. is dimensionless time, xlL is dimensionless distance. 

Antoine equation for vapor pressure of water Oswin equation for material isotherms Drying kinetics equation Belt driver power equation Pressure loss equation... 

Wolff, E. and Gibert, H., Atmospheric freeze drying. Part 2. Modeling drying kinetics nsing adsorption isotherms. Drying TechnoL, 8(2), 405-428, 1990. 

Jaafar, F. and Michalowski, S. 1990. Modified BET equationfor soiption/desorption isotherms. Drying TechnoL, 8(4) 811-827. 

If an isothermal drying process can be achieved by supplying extra heat to the fluidized bed of a dried material, a substantial increase in water content can be reached. Because of the large drying potential, an isothermal process provides several-fold larger water uptake compared to the adiabatic process in the humidity range from 30% to 90%. 

Kharaghani, A., Metzger, T, Tsotsas, E., 2011. Discrete modeling approach to mechanical effects during isothermal drying. AIChE J. 51 872-885. 

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