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Development and Validation of a Simulation Model for the Temperature Field during High-Frequency Heating of Wood

Ministry of Education, Key Laboratory of Bio-Based Material Science and Technology, College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China
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Forests 2018, 9(6), 327; https://doi.org/10.3390/f9060327
Received: 10 April 2018 / Revised: 23 May 2018 / Accepted: 30 May 2018 / Published: 4 June 2018
(This article belongs to the Section Forest Ecophysiology and Biology)
In the process of applying high-frequency heating technology to wood drying, controlling the material temperature affects both drying speed and drying quality. Therefore, research on the heat transfer mechanism of high-frequency heating of wood is of great significance. To study the heat transfer mechanism of high-frequency heating, the finite element method was used to establish and solve the wood high-frequency heating model, and experimental verification was carried out. With a decrease in moisture content, the heating rate decreased, then increased, and then decreased again. There was no obvious linear relationship between the moisture content and heating rate; the simulation accuracy of the heating rate was higher in the early and later drying stages and slightly lower near the fiber saturation point. For the central section temperature distribution, the simulation and actual measurement results matched poorly in the early drying stage because the model did not fully consider the differences in the moisture content distribution of the actual test materials. In the later drying stage, the moisture content distribution of the test materials became uniform, which was consistent with the model assumptions. Considering the changes in heating rate and temperature distribution, the accuracy of the model is good under the fiber saturation point, and it can be used to predict the high-frequency heating process of wood. View Full-Text
Keywords: high-frequency heating; wood; temperature field; simulation model high-frequency heating; wood; temperature field; simulation model
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Chai, H.; Zhao, J.; Cai, Y. Development and Validation of a Simulation Model for the Temperature Field during High-Frequency Heating of Wood. Forests 2018, 9, 327.

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