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Behaviour of a tall vertical gas-evolving cell. Part I: Distribution of void fraction and of ohmic resistance

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Behaviour of a tall vertical gas-evolving cell. Part I: Distribution of void fraction and of ohmic resistance JOURNAL OF APPLIED ELECTROCHEMISTRY 21 (1991) 386-394 Behaviour of a tall vertical gas-evolving cell. Part I: Distribution of void fraction and of ohmic resistance L. J. J. JANSSEN*, G. J. VISSER ~ Faculty of Chemical Technology* and Computing Centre ~, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands Received 30 April 1990; revised 18 August 1990 Electrolysis of a 22 wt % NaOH solution has been carried out in a vertical tall rectangular cell with two segmented electrodes. The ohmic resistance of the solution between a segment pair has been determined as a function of a number of parameters, such as, current density and volumetric rate of liquid flow. It has been found that the ohmic resistance of the solution during the electrolysis increases almost linearly with increasing height in the cell. Moreover, a relation has been presented describing the voidage in the solution as a function of the distance from the electrodes and the height in the cell. Notation Ae as bs d 4o awm F h he hs I /2o I1-19 Ix-19 i N~ nl na nc ns Qg QI R R20 electrode surface area (m 2) parameter in Equation 12 (A -1) parameter in Equation 12 distance (m) distance between the anode and the cathode (m) distance between the working electrode and an imaginary separator (m) Faraday constant (C tool- i ) height from the leading edge of the working electrode corresponding to height in the cell (m) distance from the bottom to the top of the working electrode (m) height of a segment of working electrode (m) current (A) current for segment pair 20 (A) total current for the segment pairs from 1 to 19 inclusive (A) total current for the segment pairs from x to 19 inclusive (A) current density A m -2 total number of gas-evolving pairs constant parameter in Equation 8 number of electrons in

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