文献类型：期刊文献

英文题名：Factors Affecting the Temperature Increasing Rate in Wood during Radio-Frequency Heating

作者：Huang, Rongfeng[1] Wu, Yanmei[1] Zhao, Youke[1] Lu, Jianxiong[1] Jiang, Jiali[1] Chen, Zhangjing[2]

第一作者：黄荣凤

通信作者：Chen, ZJ[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Key Lab Wood Sci & Technol, State Forestry Adm, Beijing, Peoples R China;[2]Virginia Tech, Dept Substainable Biomat, Brooks Forest Prod Ctr, Blacksburg, VA USA

年份：2013

卷号：31

期号：2

起止页码：246-252

外文期刊名：DRYING TECHNOLOGY

收录：;EI(收录号：20134817024999);Scopus(收录号：2-s2.0-84888021469);WOS:【SCI-EXPANDED(收录号:WOS:000315344600013)】；

基金：This research was funded by the State Forestry Administration "948" project of China (No. 2009-4-52).

语种：英文

外文关键词：Chinese fir; Dielectric property; Heating rate; Radio-frequency heating

摘要：Radio-frequency (RF) heating has been widely used in the wood industriesand it is essential to understand the factors affecting the heating rates. In this article, Chinese fir (Cunning hamialanceolata) was heated with RF energy intermittently at 2min per cycle to study the effect of wood moisture content (MC), sample thickness, and RF power level on heating rates. The study revealed that wood MC significantly affected the RF heating rate (p<0.01). The heating rate was the highest (5.0 degrees C/cycle) at an MC around the wood fiber saturation point (FSP). The heating rates were lower with a lower MC of 15% (0.89 degrees C/cycle) and a higher MC of 70% (1.2 degrees C/cycle). Lumber thickness did not have a significant effect on the RF heating rate at the center of the lumber; however, the heating rates at various locations along the thickness direction were significantly different. The temperature at the lumber center was 20 degrees C higher than the temperature at 10mm below the surface during heating. The heating rate for lower RF power level was initially greater than the rate at higher power RF level and then rapidly decreased. However, the heating rate at the higher RF power level remained constant during the whole heating process. RF power levels had a significant effect on the internal heating rate of wood (p<0.01).