Raising speed

Effect of lowering and raising speeds on the detachment of cadmium octadecanoate LB films from a QCM substrate at the air-water interface (20 °C)a... 

Kockelman, K. (2006). Safety Impacts and Other Implications of Raised Speed Limits on... 

Figure 5 is essentially a repetition of Figure 4 with capacity replaced by volumetric efficiency. The figure shows clearly that raising speed is beneficial for the volumetric efficiency of the pump, provided adequate suction valve area is provided. 

As to wet methods of clearing (Timonin, 2006) here, first of all, are exposed to constructive perfection of the device for liquid spraying, and in wider aspect—devices on which character of contact of cleared gas with a liquid depends. So, addition of a design of the foamy apparatus with (Aliev, 1988) stabilizer of foam has allowed in ones two times to raise speed of gas in the apparatus without damage to separation efficiency and without infringement of structure of a foam blanket. 

The formation of the turbulent twirled stream essentially differs from the forward. Under the influence of a centrifugal force in the twirled stream, there are pressure gradient on radius, the return currents, the raised speeds at a wall, non-linearity of a profile of tangential stresses, etc. In turn, these phenomena make strong impact on regularity of motion of drops of a liquid in a deduster and character of a current in a boundary layer on a phase boundary gas—a liquid, i.e., define both separation efficiency, and a water resistance, and a criticality of work of dedusters [1-9],... 

The high speed continuous filament process (69) was first used for manufacturing in 1974, and this enabled the yam production rates to be raised from 150 to 380 m /min. This system uses a pair of net conveyor belts to protect and transport an overfed warp of yams through washing and drying. 

Some studies (6) have been carried out to measure distribution of soHds in mixing tanks. Local soHds concentrations at various heights are measured at different impeller speeds. Typical data (Fig. 16) demonstrate that very high mixer speeds are needed to raise the soHds to high levels. At low levels, soHds concentration can exceed the average concentration at low mixer speeds. These soHds distributions depend on the impeller diameter, particle size, and physical properties. 

Grinder Variables. The quaUty of pulp depends on wood species, moisture content, and grinder variables such as peripheral stone speed, grit size and number per unit area, and pattern on the stone surface. Process variables that affect pulp quaUty include grinding pressure pit consistency, ie, consistency in the space immediately below the grinder (2—6%) and temperature (40—80°C). The combination of moisture and raised temperature tends to soften the lignin. 

The first commercial supersonic transport, the Concorde, operates on Jet A1 kerosene but produces unacceptable noise and exhaust emissions. Moreover, it is limited in capacity to 100 passengers and to about 3000 miles in range. At supersonic speed of Mach 2, the surfaces of the aircraft are heated by ram air. These surfaces can raise the temperature of fuel held in the tanks to 80 °C. Since fuel is the coolant for airframe and engine subsystems, fuel to the engine can reach 150°C (26). An HSCT operated at Mach 3 would place much greater thermal stress on fuel. To minimize the formation of thermal oxidation deposits, it is likely that fuel deflvered to the HSCT would have to be deoxygenated. 

Vortex Depth In an unbaffled vessel with an impeller rotating in the center, centrifugal force acting on the fluid raises the fluid level at the wall and lowers the level at the shaft. The depth and shape of such a vortex (Rieger, Ditl, and Novak, Chem. Eng. ScL, 34, 397 (1978)] depend on impeller and vessel dimensions as well as rotational speed. 

Note The speed of the motor ean be varied by vai-ying the frequeney alone but this docs not provide satisfactory performance, A variation in frequeney causes an inverse variation in the flux, for the same system voltage. The strength of magnetic field, p, develops, the torque and moves the rotor, but at lower speeds. / would be reduced, which would raise 0 , and lead the magnetic circuit to saturation. For higher s )ccds, / would be r.nised, but that would reduee which would adversely diminish the torque. Hence frequency variation alone is not recommended practice for speed control. The recommended practiee is to keep V/fas constant, to maintain the motor s vital operatin.c parameters, i.e. its torque and 0 ,. within acceptable limits. 

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