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以封闭于毛细管内的溶质扩散模拟固液分离体系中深层溶质扩散过程。采用液相色谱毛细管法测定毛细管内的二元扩散系数 ,通过分析温度、超声场 (排除热效应 )、直接超声场的影响 ,探讨了超声场对微孔深层扩散的强化作用机理。实验结果表明 ,超声场对毛细管内二元扩散系数的影响是热效应和管内流体扰动两方面共同作用的结果。在排除超声场热效应的条件下 ,随超声功率的增大 ,毛细管内的二元扩散系数随之增大 ,相对二元扩散系数与测量的流速无关 ;在无超声场作用时 ,毛细管内的相对二元扩散系数随温度升高而增大 ,呈线性关系。直接超声场的影响可采用超声场的热效应、管内流体扰动及相互作用参数叠加的方式表示。
The solute diffusion enclosed in the capillary was used to simulate the deep solute diffusion process in the solid-liquid separation system. The binary diffusion coefficient in capillary was determined by liquid chromatography capillary method. The mechanism of the enhancement of microporous deep diffusion by ultrasonic field was discussed by analyzing the influence of temperature, ultrasonic field (excluding thermal effect) and direct ultrasonic field. The experimental results show that the influence of ultrasonic field on the binary diffusion coefficient in the capillary is the result of both the thermal effect and the fluid disturbance in the pipe. Under the condition of eliminating the heat effect of ultrasonic field, the binary diffusion coefficient in the capillary increases with the increase of ultrasonic power, and the relative binary diffusion coefficient has nothing to do with the measured velocity. In the absence of ultrasonic field, the relative Binary diffusion coefficient increases with temperature, showing a linear relationship. The effects of direct ultrasound can be expressed in terms of the thermal effects of the ultrasound field, the perturbation of the fluid in the tube, and the superimposition of the interaction parameters.