perry s chemical engineers phần 3 pot

... 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 supersonic flows, the ... (6-1 03) The pressure drop for flow in spirals is discussed by Srinivasan, et al. (loc. cit.) and Ali and Seshadri (Ind. Eng. Chem. Process Des. Dev., 10, 32 8 33 2 [1971]). For fri...

Ngày tải lên: 06/08/2014, 13:22

... periodically be shed downstream. Objects such as smokestacks, chemical- processing columns, suspended pipelines, and electrical transmission lines can be subjected to damaging vibrations and forces due ... equations. This requires semi- empirical models to express the Reynolds stresses in terms of time- averaged velocities. This is the closure problem of turbulence. In all but the simplest g...

Ngày tải lên: 06/08/2014, 13:22

... 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 σ Surface ... 19 93) . 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 dim...

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 Dimensio...

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 ... accomplished by lengthening the lips (Fig. 6 -35 ). 4. Use screens (Fig. 6 -35 ) to increase overall pressure drop across the slot. Design considerations for air knives are discussed by Sene...

Ngày tải lên: 06/08/2014, 13:22

... units are the product of pressure units and volume units. Mass (M) 1 pound mass = 4 53. 5924 grams = 0.4 535 9 kilograms = 7000 grains 1 slug = 32 .174 pounds mass 1 ton (short) = 2000 pounds mass 1 ... 04 vol% m 3 /m 3 1.0* E − 02 U.K. gal/ft 3 dm 3 /m 3 L/m 3 1.605 437 E + 02 U .S. gal/ft 3 dm 3 /m 3 L/m 3 1 .33 6 806 E + 02 mL/U .S. gal dm 3 /m 3 L/m 3 2.641 720...

Ngày tải lên: 16/02/2014, 19:20

... (15-176)] ξ m Murphree stage efficiency Dimensionless Dimensionless ξ md Murphree stage efficiency Dimensionless Dimensionless based on dispersed phase ξ o Overall stage efficiency Dimensionless Dimensionless π Solvatochromic ... of dispersed Dimensionless Dimensionless phase (holdup) φ d,feed Volume fraction of dispersed Dimensionless Dimensionless phase in feed φ o Initial dispersed-phase h...

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 Dimensio...

Ngày tải lên: 27/06/2014, 14:20

... flue gas. For entrained flow systems, essentially all of the mercury in the coal will be present in the syngas. Since syngas volume is considerably less than flue gas, mercury removal systems greater ... the gasification process in the fixed bed gasifier because the hot gas leaving the gasifier dries the coal as it enters the gasifier. Since oxygen is present in the gasification process, coal...

Ngày tải lên: 08/08/2014, 15:21