Holes design factors

Fair s empirical correlation for sieve and bubble-cap trays shown in Fig. 14-26 is similar. Note that Fig. 14-26 incorporates a velocity dependence (velocity) above 90 percent of flood for high-density systems. The correlation implicitly considers the tray design factors such as the open area, tray spacing, and hole diameter through the impact of these factors on percent of flood. 

Preliminary consideration of candidate materials, processes and tooling factors, configuration, thicknesses in section, ribs, bosses, holes, surface characteristics, color, graphics, decoration, and assembly methods will begin to impose some discipline on the product design as it evolves. In the middle and latter phases of the design cycle, two or three concepts should make their validity apparent to all involved. With luck (logic), one will... 

Cmcial factors in designing membrane reactors are (1) high area for high mass transfer, (2) membranes that have a high permeabihty to only one species, (3) membranes that are catalytic, and (4) membranes that have no holes that leak reactants from one compartment to the other. With any process the reactor wiU not function properly if aU these criteria are not met, and for oxidation reactions ary leaks between compartments can be disastrous. 

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