By Stefan Jan Kowalski
This ebook offers a scientific thermomechanical idea of drying. The e-book has an interdisciplinary personality and combines the information of Chemical Engineering and Mechanics of Continua. It contents a unified method of the warmth and mass move in drying methods in addition to an exact research of all neighborhood drying results. tools for the advance of the standard of the dried items and optimization of drying strategies with appreciate to the power of fabrics and the drying time are awarded. The e-book additionally provides the speculation for totally coupled multiphase delivery in deformable capillary porous media in addition to machine simulations of drying tactics. eventually the acoustic emission procedure is defined as an experimental means of identity of fabric fractures in the course of drying.
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Extra info for Thermomechanics of Drying Processes
30 - Thermodiffusion occurs in non-isothermal conditions. The gradient of temperature involves an additional moisture flux, pointing in the same direction as the heat flux. - The evaporation-condensation mechanism concerns the second period of drying (after the critical point of drying) when the moisture inside the capillaries takes the funicular (continuous liquid on the pore walls) and pendular (isolated pockets of liquid) form. 6). Fig. 6. Evaporation-condensation mechanism Since the body temperature increases in this period, the temperature gradient is pointed towards the interior of the body.
The control volume attributed to the porous solid appears to be more natural for a description of drying phenomena. Such a volume changes in time when the porous body shrinks or swells, but the total mass of the porous solid within this volume remains unchanged. Thus, the thermodynamic system chosen in this way is closed for the porous solid and open for the moisture inside the pore space. The balance equations will be presented in the Euler's description with the use of spatial coordinates system Xi, i = 1, 2, 3.
Eq. 14a) expresses conservation of the solid skeleton in the infinitesimal control volume. The other constituents are not conserved in this volume. Liquid, vapor and air may flow across the control surface and cause increase (net influx) or decrease (net ef- 37 flux) of the mass inside the control volume. As we have stated before, the thermodynamic system is open for these constituents. 15) It is convenient to introduce a measure of moisture content relative to the porous solid whose mass is conserved during the whole drying process.
Thermomechanics of Drying Processes by Stefan Jan Kowalski