超声波—真空协同干燥自由水迁移速率  

Migration Rate of Free Water During the Ultrasound-Vacuum Combined Drying

作　　者：杨飞[1] 何正斌[1] 赵阳[1] 伊松林[1] 

机构地区：[1]北京林业大学,北京100083

出　　处：《东北林业大学学报》2012年第12期103-107,共5页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(31270604)

摘　　要：以尺寸规格为200 mm×100 mm×20 mm的核桃楸(Juglans mandshurica)为试材,在干燥温度为40、60℃,绝对压力为0.05、0.02 MPa,超声波频率为20、28 kHz和超声波功率为60、100 W的条件下进行超声波—真空协同干燥。通过对试件的干燥动力性进行对比分析,研究了干燥温度、绝对压力、超声波频率、功率对木材超声波—真空协同干燥的自由水迁移速率的影响规律,并通过统计方法得到了回归方程。结果表明:超声波的协同可以使真空干燥的自由水迁移速率提高8%～40%,自由水迁移速率随着超声波功率的增大和温度的升高而加快,且绝对压力越小,自由水迁移速率越快,但超声波频率对自由水迁移速率的影响具有不确定性。In this paper, Juglans mandshurica wood samples with the dimension of 200 mmx100 mmx20 mm was taken as the experimental material. The experiment was carried out at 20 and 30 degrees C, absolute pressure of 0.05 and 0.02 MPa, ultrasonic frequency of 20 and 28 KHz and ultrasonic power of 60 and 100 W, respectively. The effects of drying temperature, absolute pressure, ultrasonic frequency and power on the migration rate of free water during these processes were studied, and regression equations were obtained with the statistical method based on the comparative analysis of drying dynamic characters of materials dried under different conditions. Results show that the synergy of ultrasonic wave can improve the migration rate of free water by 8% to 40%, the migration rate of free water increases with the increase of ultrasonic power and drying temperature. Moreover, the smaller the absolute pressure, the faster the migration rate, while the effect of ultrasonic frequency on the migration rate of free water has some uncertainty.

关 键 词：超声波 真空干燥 干燥动力性 自由水 核桃楸 

分 类 号：S781.71[农业科学—木材科学与技术]