Abstract: In this paper a totally new microwave-assisted extraction apparatus is designed to develop the new technique——microwave extraction.The cylinder-shaped extractor has a concentric inner partition,which forms an annular space for the fluid to receive microwave energy from the inside of the concentric partition. In order to know whether it is fit for the demand of continuous production,the LDA (Laser Doppler Anemometer) method is used to measure axial velocity and tangential velocity of the fluid in the apparatus. The axial velocity and tangential velocity of different layers in the annular space are obtained, as well as the axial velocity at different rotation degrees θ. The effect of flow rate is also discussed. 2-D and 3-D figures are drawn by software Matlab to illustrate the data measured by Dual PDA. Another software PHOENICS is used to simulate and analyze the flow field in the microwave extractor. Compared with the experimental data, the result of PHOENICS is reliable.Improvement of flow field is achieved by revising the apparatus design with a conical inner partition.

Key words:

微波萃取器, 微波辅助提取, 激光多普勒速度测量, Dual PDA, PHOENICS软件模拟

摘要： 为了考察自行设计的微波萃取器是否符合连续生产时流体流动的要求，用激光多普勒测速仪测定了该萃取器内流体的轴向速度和切向速度，得到流体轴向速度和切向速度在内外环隙不同层数间的分布；考察了流体轴向速度在不同旋转度θ上的分布，讨论了入口流速Q的影响，并将测得的数据用Matlab软件编程绘出二维和三维图.将初步设计的微波萃取器的实验数据图与PHOENICS软件模拟的流场分布图作比较，两者吻合较好.利用PHOENICS软件对两次改进设计的微波萃取器作流场模拟和分析，得到两次改进设计对流场分布有较大影响.第2次改进设计使其内筒呈锥台，既能有效地吸收微波能，又能使流体内部形成大漩涡.

关键词:

微波萃取器, 微波辅助提取, 激光多普勒速度测量, Dual PDA, PHOENICS软件模拟