perry s chemical engineers phần 2 docx

... between vessel and pump; S 0 = system speed as given by Eq. (6-80), assumed independent of pressure; p 1 = initial vessel pressure; p 2 = final vessel pressure; and p 0 = lowest pump intake pressure ... 7.5°<α< A 1 ᎏ A 2 V 1 2 ᎏ 2 V 1 2 − V 2 2 ᎏ 2 D 2 ᎏ D 1 1 ᎏᎏ 6 tan (α /2) 32V 2 ᎏ D 2 D 2 ᎏ D 1 1 ᎏᎏ 6n tan (α /2) 8V 2 ᎏ D 2 3n + 1 ᎏ 4n 35°. For angles gr...

Ngày tải lên: 06/08/2014, 13:22

... (Concluded) U .S. Customary U .S. Customary Symbol Definition SI units System units Symbol Definition SI units System units X f C Pseudoconcentration of Mass ratios Mass ratios solute in feed for case C [Eq. ... dispersed Dimensionless Dimensionless phase (holdup) φ d,feed Volume fraction of dispersed Dimensionless Dimensionless phase in feed φ o Initial dispersed-phase holdup Dimensionless D...

Ngày tải lên: 16/02/2014, 19:20

... fraction of phase i Dimensionless Dimensionless Re Reynolds number Dimensionless Dimensionless s Density ratio Dimensionless Dimensionless U .S. customary Symbol Definition SI units units s Entropy ... mass J/(kg ⋅ K) Btu/(lbm ⋅ R) S Slope Dimensionless Dimensionless S Pumping speed m 3 /s ft 3 /s S Surface area per unit volume l/m l/ft St Strouhal number Dimensionless Dimensionl...

Ngày tải lên: 06/08/2014, 13:22

... investigators. In some cases, statistical analysis of pressure fluc- tuations has been used to distinguish flow patterns. Figure 6 -24 (Alves, Chem. Eng. Progr., 50, 449–456 [1954]) shows seven flow ... diverging channels, subsonic flows are decelerated as the pressure and density increase. In subsonic flow, the converging channels act as nozzles and diverging channels as diffusers. In super...

Ngày tải lên: 06/08/2014, 13:22

... Multiphase systems introduce such design criteria as solids suspension and gas dispersion. In very viscous systems, helical rib- bons, extruders, and other specialized equipment types are favored over ... 6-35). 4. Use screens (Fig. 6-35) to increase overall pressure drop across the slot. Design considerations for air knives are discussed by Senecal (ibid.). Design procedures for extrusion di...

Ngày tải lên: 06/08/2014, 13:22

... flows past objects or through orifices or similar restric- tions, vortices may periodically be shed downstream. Objects such as smokestacks, chemical- processing columns, suspended pipelines, and electrical ... approximation, simplified here for incompressible flow, which treats the Reynolds stresses as analogous to viscous stresses, introducing a scalar quantity called the turbulent or eddy...

Ngày tải lên: 06/08/2014, 13:22

... 1993). DIMENSIONLESS GROUPS For purposes of data correlation, model studies, and scale-up, it is useful to arrange variables into dimensionless groups. Table 6-7 lists many of the dimensionless groups ... and passed down the spectrum of eddy lengths according to the scaling rule ⑀ = (6 -22 3) which is consistent with Eqs. (6 -22 1) and (6 -22 2). For the medium, or energy-containing, eddy siz...

Ngày tải lên: 06/08/2014, 13:22

... 51.0 72 . 920 22 .17 22 .30 7.66 12 57.310 . 625 94.00 94.90 5 .20 14 39.910 . 725 63.10 63.67 6.03 52 45.146 . 825 39.70 40. 02 6.8691 51.384 . 925 21 .35 21 .47 7.7 029 57. 622 .630 92. 22 93.10 5 .24 31 39 .22 2 .730 ... pressure units and volume units. Mass (M) 1 pound mass = 453.5 924 grams = 0.45359 kilograms = 7000 grains 1 slug = 32. 174 pounds mass 1 ton (short) = 20 00 po...

Ngày tải lên: 16/02/2014, 19:20

... Dimensionless Dimensionless s Density ratio Dimensionless Dimensionless U .S. customary Symbol Definition SI units units s Entropy per unit mass J/(kg ⋅ K) Btu/(lbm ⋅ R) S Slope Dimensionless Dimensionless S ... Dimensionless Dimensionless N b Blend time number Dimensionless Dimensionless N D Best number Dimensionless Dimensionless N P Power number Dimensionless Dimensionless N Q Pum...

Ngày tải lên: 27/06/2014, 14:20

... Scissors ScissorsScissors Scissors shorts shortsshorts shorts Pants PantsPants Pants jeans jeansjeans jeans tongs tongstongs tongs Trousers TrousersTrousers Trousers eyeglasses eyeglasseseyeglasses eyeglasses ... when whenwhen when phải là simple past simple pastsimple past simple past và sau while whilewhile while phải là Past Progressive Past ProgressivePast Progr...

Ngày tải lên: 12/07/2014, 08:21