Investigations of Convective Drying of Thin and Thick Wet Materials
https://doi.org/10.21122/1029-7448-2025-68-5-457-476
Abstract
The regularities of drying thin and thick ceramic samples and clay plates are considered, the values of the Biot heat exchange number in the process of drying ceramics and clay plates of different thicknesses are established, as well as the nature of the change in the drying temperature coefficient for its various values. An analysis of the experiment on drying of thin and thick materials showed that such division based on one Biot number is insufficient, since the Biot value depends on many factors – the drying mode, the heat transfer coefficient, the type of wet body and its coefficient of thermal conductivity of a dry body. The most significant influence on the Biot value is exerted by the complex form of the dependence of the coefficient of thermal conductivity of a wet body on moisture content and temperature. Based on the study and analysis of many sources, formulas have been established for determining the coefficients of thermal conductivity of wet bodies. For a comprehensive assessment of the possible division of materials into thin and thick, the influence of a group of heat and mass transfer similarity criteria on the temperature coefficient of drying was studied. A possible method for dividing materials into four groups based on the value of heat and mass exchange Biot numbers and the Lykov criterion is proposed. The limits of change in the Lykov criterion are established depending on the value of the Biot numbers. Calculations of the average temperature during drying of thin and thick ceramic samples and clay plates are presented using formulas and a comparison of the values with experimental data is given.
About the Authors
A. I. Ol’shanskii
Vitebsk State Technological University
Belarus
Belarus
г. Витебск
A. N. Golubev
Vitebsk State Technological University
Belarus
Belarus
Address for correspondence:
Golubev Aleksei N. –
Vitebsk State Technological University
72, Moskovsky Ave.,
220035, Vitebsk, Republic of Belarus
Tel.: +375 29 112 79 25
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Review
For citations:
Ol’shanskii A.I., Golubev A.N. Investigations of Convective Drying of Thin and Thick Wet Materials. ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations. 2025;68(5):457-476. (In Russ.) https://doi.org/10.21122/1029-7448-2025-68-5-457-476
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