Centrifugal stress

Density is a particularly important characteristic of alloys used in rotating machinery, because centrifugal stresses increase with density. Densities of the various metals in Table 1 range from 6.1 to 19.3 g/cm. Those of iron, nickel, and cobalt-base superaHoys fall in the range 7-8.5 g/cm. Those alloys which contain the heavier elements, ie, molybdenum, tantalum, or tungsten, have correspondingly high densities. 

High-speed, capacity-acceptable centrifugal stresses... 

Density is a particularly important characteristic of alloys used in rotating machinery, because centrifugal stresses increase with density. Alloys which contain the heavier elements. i.e molybdenum, tantalum, or tungsten, have correspondingly high densities. 

In thickening and centrifugation when gravitational and centrifugal stresses are involved, Equation (22.31) is replaced by more complex expressions Tiller and Hsyung (1993). 

Turbine Tip Speed 400m/s, based on maximum centrifugal stress of the superalloy rotor... 

Materials of Construction and Operational Stress. Before a centrifugal separation device is chosen, the corrosive characteristics of the Hquid and soHds as weU as the cleaning and saniti2ing solutions must be deterrnined. A wide variety of materials may be used. Most centrifuges are austenitic stainless steels however, many are made of ordinary steel, mbber or plastic coated steel. Monel, HasteUoy, titanium, duplex stainless steel, and others. The solvents present and of course the temperature environment must be considered in elastomers and plastics, including composites. 

The geometry of the bowl parts is important, and for intermittently discharging centrifuges, fatigue strength must be considered. In general the tangential stress in a bowl wall is CJ. ... 

The stress resulting from the axial forces must be considered in analy2ing the parts which resist axial separation, such as bolts, nuts, rings, etc. On scroU centrifuges the axial force owing to the axial component of the conveyor torque must also be considered. 

Goldberg and Rubin [Ind. Eng. Chem. Proce.s.s Des. Dev., 6 195 (1967)] showed in tests with a disk spinning vertically to the foam layer that most mechanical procedures, whether centrifugation, mixing, or blowing through nozzles, consist basically of the application of shear stress. Subjecting foam to an air-jet impact can also provide a source... 

Stress in the Centrifuge Rotor The stress in the centiifuge rotor is quite complex. Analytical methods, such as the finite element... 

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