不同含水率的杨木微波穿透深度探究  

Penetration depth of microwave in cotton wood with different moisture contents

作　　者：廖春荣[1] 罗勇锋[1] 贺霞[2] 张剑雄 熊峰[1] 谢杰[2] 李贤军[2] 

机构地区：[1]中南林业科技大学理学院,湖南长沙410018 [2]中南林业科技大学材料科学与工程学院,湖南长沙410018

出　　处：《中南林业科技大学学报》2017年第10期133-138,共6页Journal of Central South University of Forestry & Technology

基　　金：国家自然基金项目(31370564);湖南省研究生科研创新基金项目(CX2016B344);中南林业科技大学研究生科技创新基金项目(CX2016A04)

摘　　要：采用有限元分析方法对不同含水率杨木的微波穿透深度进行了理论研究,探索出微波频率和杨木含水率对微波穿透深度的影响规律,结果表明:当杨木含水率由30%依次增加到110%时,频率为2.45 GHz微波的穿透深度由22.30 cm减小到3.64 cm;频率为0.915 GHz的微波穿透深度从60.32 cm降低到9.85 cm,同时含水率增加后杨木内部温度均匀性相应变差。研究表明,在木材干燥过程中应尽量将样品的厚度控制在微波穿透深度的范围内,可以有效改善干燥均匀性。In this study, the finite element analysis method was used to study the microwave penetration depth of poplar wood with different moisture content. The influence of microwave frequency and moisture content of poplar on microwave penetration depth was explored. The results showed that when the moisture content of poplar wood increased from 30% to 110%, the penetration depth of microwave with 2.45 GHz decreased from 22.30 cm to 3.64 cm, and the penetration depth microwave with 0.915 GHz decreased from 60.32 cm to 9.85 cm, meanwhile, the internal temperature uniformity of poplar wood became worse when the water content increased. In the process of drying wood, the thickness of the sample should be controlled in the depth of the microwave penetration for improving dry uniformity.

关 键 词：有限元法 微波加热 微波穿透深度 微波干燥 干燥均匀性 

分 类 号：S781.9[农业科学—木材科学与技术]