Modeling of Heat and Moisture Transfer in Wood in Finish Drying by the Energy of a Microwave Field
Tóm tắt
A physicomathematical model of heat and moisture transfer in drying materials in the region below the hygroscopicity limit, including also the heating by the energy of a microwave field, has been developed. The developed system of equations has been solved numerically for three cases of drying of a wooden plate: convective drying, drying by the microfield-field energy, and drying combining the above two methods, i.e., combined drying. Results of numerical calculations of the temperature, vapor-pressure, and moisture-content distributions in the cross section of the plate at different instants of time, and also of the change in the average moisture content and temperature in the process of drying, have been presented. The calculation results have been analyzed; conclusions on the differences and distinctive features of convective, microwave, and combined heating and drying have been drawn.
Tài liệu tham khảo
A. L. Adamovich, Determination of the complex permittivity of wood in the microwave range, Vestn. Polotsk. Gos. Univ., Ser. C. Fundam. Nauki, No. 10, 37–43 (2005).
N. N. Grinchik, Processes of Transfer in Porous Media, Electrolytes, and Membranes [in Russian], ANK Inst. Tepl. Massoobmena im. A. V. Lykova AN BSSR, Minsk (1991).
S. P. Kundas, N. N. Grinchik, I. A. Gishkelyuk, and A. L. Adamovich, Modeling of the Processes of Heat and Moisture Transfer in Capillary-Porous Media [in Russian], ANK Inst. Tepl. Massoobmena im. A. V. Lykova NAN Belarusi, Minsk (2007).
I. V. Krechetov, Drying of Wood [in Russian], Lesnaya Promyshlennost′, Moscow (1980).
G. S. Shubin, Drying and Heat Treatment of Wood [in Russian], Lesnaya Promyshlennost′, Moscow (1990).
I. V. Akulich, Thermodynamic Processes in the Drying Technology [in Russian], ANK Inst. Tepl. Massoobmena im. A. V. Lykova NAN Belarusi, Minsk (2002).