Baffles, types

For counterflow plates, the curves of Fig. 14-25 may be used for open areas of 20 percent or greater. Plates with 15 percent open areas have about 85 percent of the cui ve values, and open areas or less than 15 percent are not recommended. For counterflow-plate columns of the segmental-baffle type, 50 percent cut, allowable values are about 15 percent greater than tnose shown in Fig. 14-25, when vertical spacings of the baffles are equal to the trav spacings shown. 

The most comprehensive correlation for heat transfer to vertical baffle-type coils is for a disk flat-blade turbine over the Reynolds number range lO to (2)(10 ) ... 

There are many baffle type impingement separators. The efficiency of operation for entrainment is entirely a function of the contacting action inside the particular unit. There are no general performance equations which will predict performance for this type of unit therefore manufacturers performance data and recommendations should be used. A few of the many available units are shown in Figures 4-28 to 4-31. Many use the Chevron-style verdcal plates as shown in Figures 4-17A and 4-30. 

Baffle Type Separator Speclflcatlona Separator Appllcatloni (Slve Serrlce)... 

Second, any valve which has been designed to operate on steam should not be expected to work at its best when supplied with a mixture of steam, water and dirt. A separator, drained through a steam trap, will remove virtually all the water from the steam entering the pressure-reducing set. The baffle type separators are found to be effective over a wide range of flow rates. 

Two types of bioreactors have been used to produce SCP from sugar sources, namely stirred/baffled type and the air-lift with draught tube type (figure 4-5), with various capacities up to 400 m. 

Lines in vacuum service, 135—141 Line symbols, 17, 23 Numbering, 23 Lined centrifugal pumps, 171 Liquid-solid particle, separators, 228 Baffle type specifications, 248 Baffle type, 247, 248 Centrifugal, 256, 259-261 Chcvron-vanc, 248, 235 Comparison chart, 230 Cyclone, 259 Specification form, 268 Vane, 259 Wire mesh, 246 York-vane, 248 Low pressure storage... 

Two shell passes are obtained with a longitudinal baffle, type F in Figures 8.11(a) or 8.3(c). More than two shell passes normally are not provided in a single shell, but a 4-8 arrangement is thermally equivalent to two 2-4 shells in series, and higher combinations are obtained with more shells in series. 

New nomenclature da is outside tube diameter of coil, Dc is coil diameter, tiby is number of vertical baffle-type coils, Sc is coil spacing, W is impeller blade width, and Zt is height of coil from tank bottom. 

Fiq. 28. Vacuum crystallizer. Draft tube and baffle type. After Newman and Bennett (N3). 

Various equipment and process improvements have been introduced in the industrial practice of crystallization from solution (S15, S16). Saeman (S14) has published a comprehensive discussion of crystallizer design principles, extending some of his earlier work cited above (Si, S4). A companion paper by Garrett (G9) considers the application of theory to the selection and operation of commercial equipment, Design and operation of draft tube and baffle type crystallizers is reviewed by Caldwell (C6),... 

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