Modeling an Elastic Stress in a Colloid Capillary-Porous Body in Its Dehydration by Depressurization

• Published in: Journal of engineering physics and thermophysics Vol. 95; no. 3; pp. 716 - 720
• Main Authors: Gorbachev, N. M., Brich, M. A., Koznacheev, I. A.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-05-2022; Springer; Springer Nature B.V
• Subjects: Classical Mechanics; Complex Systems; Dehydration; Engineering; Engineering Thermodynamics; Heat and Mass Transfer; Hygroscopicity; Industrial Chemistry/Chemical Engineering; Moisture content; Moisture effects; Pressure effects; Pressure reduction; Shrinkage; Stresses; Thermodynamics; depressurization; colloid capillary-porous body; modeling; thermomechanical treatment; mechanical stress; dehydration; shrinkage
• ISSN: 1062-0125; 1573-871X
• DOI: 10.1007/s10891-022-02528-5

Consideration has been given to combined effects of the pressure gradient and shrinkage on the distribution of mechanical stresses in a wood specimen subjected to dehydration by depressurization. The time variation in the moisture distribution across the specimen cross section has been identified. The observed redistribution of moisture from the center to the specimen surface results in the pressure gradient values being relatively low. Due to a more uniform water content, there is also a decrease in mechanical stresses associated with shrinkage. Calculations have shown that the effects of shrinkage are the most substantial in the case of water content reduction below the wood hygroscopicity limit (fiber saturation point), and also, in the case of dehydration of large-size specimens. The obtained dependences can be used for identifying treatment regimes for various materials without deterioration in their consumer properties.