THE DRYING CHARACTERISTICS OF ULTRASOUND ASSISTED WOOD VACUUM DRYING

摘要：

Wood vacuum drying is one of the best drying methods, while drying defects appear easily when the drying temperature is high.In this paper, ultrasound was taken as an assistant tool during wood vacuum drying.The drying conditions are the drying temperature of 60℃, the absolute pressures of 0.05MPa and 0.08MPa, the ultrasonic power and frequency of 100W and 28kHz respectively.The results show that the water effective diffusion coefficients for the specimens dried by ultrasound assisted vacuum drying are 4.87×10-8 m2s-1 and 4.62×10-8 m2s-1 respectively and that for the ones dried without ultrasound are 3.68×10-8 m2s-1 and 3.61×10-8m2s-1 separately; the drying rate of ultrasound assisted vacuum drying is much faster than that of drying without ultrasound and the drying rate at the absolute pressure of 0.05MPa is faster than that of 0.08MPa; ultrasound is more beneficial to dry the free water, no drying defects appear during the whole drying process and ultrasound assisted vacuum drying could dry wood at a low temperature with a high drying rate to avoid drying defects during wood vacuum drying.

关键词： ultrasound wood vacuum drying water effective diffusion coefficient drying rate fiber saturation point

作者: He Zhengbin Peng Yiqing Yang Fei Yi Songlin

作者单位: College of Material Science and Technology,Beijing Forestry University35 Qinghua East Road,Haidian d College of Material Science and Technology,Beijing Forestry University 35 Qinghua East Road,Haidian

会议类型: 国际会议

会议名称: The 7th Asia-Pacific Drying Conference(第七届亚太地区干燥会议 ADC2011)

会议地点: 天津

会议语种:英文

页码: 1-8

在线出版日期: 2011-09-18（万方平台首次上网日期，不代表论文的发表时间）