perry s chemical engineers phần 5 pot

... 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

... 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 [1 954 ]) shows seven flow ... the pressure of the surroundings into which the gas flow discharges. The pressure drops from the exit pressure to the pressure of the surroundings in a series of shocks which are highly no...

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 ... [1969]) and Pazwash and Robertson (J. Hydraul. Res., 13, 35 55 [19 75] ) for spheres set- tling in Bingham plastics. Beris, Tsamopoulos, Armstrong, and Brown (J. Fluid Mech., 158 [19 85] ) p...

Ngày tải lên: 06/08/2014, 13:22

... 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

... 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 ... minor losses or miscellaneous losses. These descriptions are misleading because in process piping fitting losses are often much greater than the losses in straight piping sections. Equivalen...

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 ... vertical solid/liquid flow, but also to gas/solid flow and to horizontal flow. For fast-settling slurries, ensuring conveyance is usually the key design issue while pressure drop is somewhat...

Ngày tải lên: 06/08/2014, 13:22

... .9 45 18. 15 18.24 7.8697 58 .869 . 650 85. 38 86.19 5. 4098 40.468 . 750 56 .67 57 .17 6.2437 46.706 . 850 34.71 34.97 7.07 75 52.943 . 950 17.37 17. 45 7.9114 59 .181 . 655 83.74 84 .53 5. 451 5 40.780 . 755 55 .43 ... 82.260 1 .57 0 52 .64 114 13.0812 97. 854 1.820 65. 33 164 15. 1 658 113.448 1.0 75 10.12 15 8. 953 7 66.978 1.3 25 35. 57 65 11.0383 82 .57 2 1 .57 5 52 .94...

Ngày tải lên: 16/02/2014, 19:20

... ratio, mass ratio basis Mass ratio/ Mass ratio/ (Bancroft coordinates) mass ratio mass ratio K″ Partition ratio, mass fraction Mass fraction/ Mass fraction/ basis mass fraction mass fraction K o Partition ... theoretical stages Dimensionless Dimensionless in stripping section N w Number of theoretical stages Dimensionless Dimensionless in washing section P Pressure bar or Pa atm or lb f /in...

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

... and the nodes in x s right subtree immediately fol- low x. Thus, x s predecessor is in its left subtree, and its successor is in its right subtree. Let s be x s successor. Then s cannot have a left ... walk] Must add nodes in y s sibling s subtree. • If y is a left child, its sibling s subtree follows all nodes in y s subtree ⇒ don’t change r. • If y is a right child, all nodes in...

Ngày tải lên: 13/08/2014, 18:20