文献类型：期刊文献

英文题名：Influence mechanism of radio frequency heating on moisture transfer and drying stress in larch boxed-heart square timber

作者：Fu, Zongying[1] Avramidis, Stavros[2] Weng, Xiang[1] Cai, Yingchun[3] Zhou, Yongdong[1]

第一作者：付宗营

通信作者：Zhou, YD[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Key Lab Wood Sci & Technol State Forestry Adm, Beijing 100091, Peoples R China;[2]Univ British Columbia, Dept Wood Sci, Vancouver, BC, Canada;[3]Northeast Forestry Univ, Coll Mat Sci & Engn, Harbin, Heilongjiang, Peoples R China

年份：2019

卷号：37

期号：13

起止页码：1625-1632

外文期刊名：DRYING TECHNOLOGY

收录：;EI(收录号：20184906213175);Scopus(收录号：2-s2.0-85057596631);WOS:【SCI-EXPANDED(收录号:WOS:000480554300003)】；

基金：This work was supported by the Fundamental Research Funds for the Central Non-profit Research Institution of Chinese Academy of Forestry (CAFYBB2017ZC003).

语种：英文

外文关键词：Radio frequency heating; larch boxed-heart square timber; moisture transfer; drying stress

摘要：Radio frequency heating combined with convection (RF/C) drying of larch boxed-heart square timber and its influence on drying kinetics such as rate, moisture content distribution, and stresses was explored. Results revealed that RF heating increased the drying rate and in RF/C drying was twice as high as in conventional drying. Below fiber saturation point, RF heating reduced internal moisture gradients, especially around moisture content of 20%. The effect of RF heating on moisture transfer was strongly associated with moisture content. Specifically, above the fiber saturation point, RF heating played a minor role in moisture transfer however, it reached maximum around fiber saturation point and thereafter, it largely decreased with moisture content. RF heating relieved some drying stresses during RF/C drying and reduced residual stresses in the timber surface layers. Furthermore, it changed the original development pattern of drying stresses in conventional drying.