Baffle Opening

The arrangement of baffle openings shown in F ure 2-9a should be used with dirty fluids because if silt or sediment drops out in the shell, it -ends to be flushed with the flow. For dirty fluids, the flow should be from side to side lorizontal), and for nonfouling liquids it may be n any direction — horizontal, vertical or diagonal. 

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Curve g is for disk flat-blade turbines operated in unbaffled vessels filled witb liquid, covered, so tbat no vortex forms. If baffles are present, tbe power characteristics at high Reynolds numbers are essentially tbe same as curve h for baffled open vessels, witb only a slight increase in power. 

Shell and tube Rolled ends at tube sheet Open welds at tube sheet Beneath deposits Water box gaskets Bolt holes, nuts, washers Baffle openings Disbonded water box linings... 

Figure 10-60. Shell-side mass velocity through baffle opening Gi,. (Used with permission Ning Hsing Chen, Chemical Engineering, V. 65, 1958. McGraw-Hill, Inc. All rights reserved.)...

With the system n-butylamine-kerosene-water (a difficult system) in a 16-in.-diameter tower, 10-in. disk diameter, 4-in. compartment height, 12-in. baffle opening, total flow was 91.2 cu. ft./(hr.)(sq. ft.), and HETS was 2 ft., corresponding to a throughput/volume of a theoretical stage = 45.6 hr.-1. 

The internals for these columns have also been called splash decks or shower decks, descriptive terms to indicate the type of phase contacting expected. Vapor (or gas) flows upward through the baffle openings and there contacts the liquid showering down from one baffle to the next. Figure 12.42 shows a representative baffle tray column containing segmental baffles. 

Mass velocity through baffle opening, based on the area of opening less area of the tubes passing through it, lb./hr./sq.ft. 

C[)= Mass velocity through baffle opening, G = Crossflow mass velocity,... 

The reactor is shown in Fig 1.It was constructed of five one type compartments 2 with 1 0 mm I D The compartments were separated by horizontal baffles with central openings 3 Two equal-sized discs were installed in each compartment.One of the discs 4 was centrally located while the other 5 was mounted close to the baffles at 3-5 mm over the opening.These discs carried out the mixing successfully The diameters of the discs(size A)and those of the baffle openings(size B)are different for individual compartments of the reactor(Table 1) (Numeration of the stages coincides with direction of flow.)... 

Flow IS assumed to be from the centroid of one baffle opening to the cen troid of the next. This may be counted or computed if a tube layout is a ailable, but often it must be estimated. The total number of roAvs of tubes across a bundle is approximately L/P for a square-pitch arrange-mewi (or 2L/P for triangular pitch) and thus the total number of rows of tubes N traversed by the fluid becomes... 

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