A study has been made of mass transfer to a circular disk electrode Ioo cated in the stagnation region of an impinging jet. A semiempirical solution of a convective diffusion model is presented in the form of an asymptotic series to permit an estimate of the transfer rate for 0.7 ~ Sc < ~. Experimental results reveal that the electrode possesses a property of "uniform accessibility" to the diffusing species if the electrode radius is less than 1 nozzle diameter for turbulent jet and Y2 nozzle diameter for laminar jet. Within this region, the mass transfer is relatively independent of radial positions, and the semiempirical correlations are presented for both laminar and turbulent flows over a range of nozzle heights from 0.2 to 6 nozzle diameters. The result indicates that the impinging jet electrode is a feasible tool for electroanalytical applications. 'I ~s geometry can be easily adopted in process streams and closed systems at a pressure other than the ambient atmosphere.

An experimental and theoretical study has been made to determine the feasibility of a hydrogen‐bromine cell for energy storage applications. The laboratory data were collected for the cell performance and the membrane characteristics during the charge and the discharge operations. An unsteadystate heat balance was used to predict the temperature change and the overall electric‐to‐electric efficiency. The results indicate that the hydrogen‐bromine system can achieve an efficiency greater than 70% when the operating cell current density is less than 160 mA/cm2.

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