ELECTROCHEMICAL MEASUREMENT OF FLOW PARAMETERS IN DILUTE SOLUTION

A new theoretical method is proposed in the electrochemical measurement to obtain therelationship between flow parameter and the electrode current under the existence of ion migration ef-fect.In this way the measurement of local mass transfer coefficient,wall shear stress and liquid veloc-ity are presented and the experiment results are also described.

Cu^(2+)在醋酸盐离子液体中的电化学性能及电沉积

采用循环伏安法(CV)研究了二价铜离子在1-丁基-3-甲基咪唑醋酸盐[C_(4)C_(1)Im][OAc]离子液体中的氧化还原过程及电化学行为。实验结果表明:[C_(4)C_(1)Im][OAc]离子液体的电化学窗口为3.3 V;铜离子在[C_(4)C_(1)Im][OAc]中的氧化还原为非可逆过程,铜离子还原过程受扩散传质控制,由Cu^(2+)→Cu^(+)、Cu^(+)→Cu^(0)的扩散系数分别为0.0009394,0.001752 cm^(2)/s,SEM及XRD分析表明铜离子在醋酸盐离子液体中可以被沉积出来。

稀电解质溶液中传递现象电化学测试技术

介绍了仅在溶液中加少量电解质进行流场有关参数测试的电化学方法，对测试过程中的数据与信号处理、溶液体系的性质和选择、电极的安装形式及操作条件等方面进行了探讨。本文所讨论的方法可作为研究流体力学和化工过程传递现象的测试手段。

液体速度电化学测试法传质解

Under the existence of ionic migration effect, the differential equation describing mass transfer to stagnant point and its solution are deduced. Then the mathematical relation between current of measuring probe and liquid velocity is obtained. All the results in this paper can be also applied to the case without ionic migration effect. The theoretical result is verified by the experiment in which the ionic migration effect is changed by different concentrations of supporting electrolyte.

边缘传质对壁面电极传感器的影响

The wall electrode sensors have been widely used in the measurement of transport process.However,the theoretical equations in prior work did not include the effect of mass transfer to the edge of wall probe.This effect will bring an important contribution to the electrode current if the probe is small enough,which a lager measuring error if the original equation is used.This paper gives some modified equations in which the effect of mass transfer to the probe edge is considered.The experiment results pressented have supported these equations.

Mass transfer mechanisms in fixed-bed adsorption of erythromycin

The equilibrium and kinetic characteristics of the adsorption of erythromycin to Sepabeads SP825 were determined.The equilibrium data in a batch system was well described by a Langmuir isotherm.The separation performance was investigated in a fixed-bed system with respect to the adsorption superficial velocity,ionic strength and pH.A mathematical model was used to simulate the mass transfer mechanism,taking film mass transfer,pore diffusion and axial dispersion into account.The model predictions were consistent with the experi-mental data and were consequently used to determine the mass transfer coefficients.