perry s chemical engineers phần 4 doc

... 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 ... 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 less important. For nonsettling...

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

... Dimensionless Dimensionless process [Eq. (15-176)] ξ m Murphree stage efficiency Dimensionless Dimensionless ξ md Murphree stage efficiency Dimensionless Dimensionless based on dispersed phase ξ o Overall ... 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 fra...

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

... to the visual interpretation of indi- vidual investigators. In some cases, statistical analysis of pressure fluc- tuations has been used to distinguish flow patterns. Figure 6- 24 (Alves, Chem. ... equilibrium state as pressure drops with distance, or as heat is added or lost, may require that interphase mass transfer, and changes in the relative amounts of the phases, be considered. Wallis...

Ngày tải lên: 06/08/2014, 13:22

... similar restric- tions, vortices may periodically be shed downstream. Objects such as smokestacks, chemical- processing columns, suspended pipelines, and electrical transmission lines can be subjected ... (Trans. ASME J. Pressure Vessel Tech., 102, 138– 145 [May 1980]) and Chen (J. Sound Vibration, 93, 43 9 45 5 [19 84] ). BEDS OF SOLIDS Fixed Beds of Granular Solids Pressure-drop predictio...

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 ... time s µ Fluid viscosity Pa ⋅ s µ ∞ Infinite shear viscosity (Bingham plastics) Pa ⋅ s ρ Fluid density kg/m 3 ρ G , ρ L Gas, liquid densities kg/m 3 ρ d Dispersed phase density kg/m 3...

Ngày tải lên: 06/08/2014, 13:22

... Standards. 141 .5 ᎏ sp gr sp gr 60°/60°F − 1 ᎏᎏ 0.005 140 ᎏ sp gr 145 ᎏ sp gr 1-17 TABLE 1-8 Kinematic-Viscosity Conversion Formulas Range of Kinematic viscosity, Viscosity scale t, sec stokes Saybolt ... (lb)(ft 3 )/in 2 10.73 lb/ft 2 abs ft 3 lb-moles ft-lb 1 545 .0 *Energy units are the product of pressure units and volume units. Mass (M) 1 pound mass = 45 3.59 24 grams = 0 .45 359...

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

... divides the required task into sub-tasks, modules, sub-systems or processes of various types. Functions are a natural way of imple- menting such designs in C. • Even without software ... 4. 0 is assigned to variable A. In the second instance, *A2tr means 'store the value 4. 0 as the contents of the variable whose address is held in Aptr'. Significant use...

Ngày tải lên: 12/08/2014, 09:22