By F. Goodridge, K. Scott
Because the subtitle exhibits, the overriding goal of the authors has been to supply a pragmatic consultant to the layout of electrolytic plant. we would have liked to teach that the techniques for the layout and optimization of the sort of plant are basically easy and will be played via readers relatively new to the electrochemical box. It used to be very important to gain that electrochemical engineering shouldn't be harassed with utilized electrochemistry yet needed to be according to the rules of chemical engineering. as a result, reference is usually made to plain chemical engineering texts. on the grounds that it is a sensible consultant instead of a textbook, we've integrated lots of labored examples at the precept stable labored instance is worthy many paragraphs of textual content. In a few examples now we have quoted charges, e.g., of chemical substances, plant or providers. those expenses are in basic terms illustrative; present values must be acquired from brands or journals. If this isn't attainable, approximate equipment can be found for updating charges to present-day values (see Refs. 1 and three, bankruptcy 6).
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Extra info for Electrochemical Process Engineering: A Guide to the Design of Electrolytic Plant
The hydrodynamics of the flow between the two cylinders can be characterized by a dimensionless quantity Ta, the Taylor number, named after the mathematician G. I. 23) ~ where u; is the peripheral velocity of the rotating cylinder. On the basis of the Taylor number one can distinguish three flow regimes: 1. At low flow rates a simple laminar, or Couette, flow prevails in which the velocity of the fluid is tangential. This region is character- o--.. o--.. 8. Rotating cylinder. (a) No axial flow; (b) with axial flow.
24) shows no dependence on the dimensions of the outer cylinder. 2. 2 m 3 every 8 hours. 05 m. The reaction takes place under mass transfer limiting conditions. If the maximum rotation speed of the cylinder is 150 rpm, determine whether the operation is feasible if the required conversion is to be 80%. If so, what is the required rotation speed and what is the maximum conversion possible? Assume that axial flow in the reactor can be ignored. 1 x 10- 6 m 2 /sand the Schmidt number Sc is 2500. THE SOLUTION: First we see whether the mass transfer coefficient can be calculated from Eisenberg's Eq.
If the forward velocity of the electrolyte u is measured at a number of points along a normal to the electrodes, a plot will give a velocity profile (Fig. 1). Within the region 0 < y < D the velocity of flow is less than that of the free stream V, and the boundary layer thickness at the place where we made our observation is D. Further measurements would show that i5 = 0 at the leading edge of the electrode (Fig. 2a) and increases as we proceed along the electrode in the direction of flow. The character of flow in the boundary layer is initially laminar, but at some point down the electrode it changes to a transitional character (the fluid is sometimes laminar sometimes turbulent), although a thin layer adjacent to the plate remains laminar (Fig.