Pressure efficiency

A Back-Pressure Efficiency Factor. Because a gaseous diffusion stage operates with a low-side pressure p which is not negligible with respect to there is also some tendency for the lighter component to effuse preferentiahy back through the barrier. To a first approximation the back-pressure efficiency factor is equal to (1 — r), where ris the pressure ratiopjpj. 

These efficiency factors are discussed in more detail in References 26—28. Actually, the barrier and back-pressure efficiencies are interrelated and caimot be formulated independently, except only as an approximation. A better formation that has been found to fit the experimental results is ... 

Shock Relationships and Formulas, which include Changes During Steady Reversible Compressible Flow (61-4) Pressure-Velocity Relationship (65-6) Irreversibility and Degradation (66-8) Derivation of Formulas (68-70) Pressure Efficiency Factor and Recovery Factor (70-2) and Oblique Shocks in Air (72). Shock Wave Interaction, which includes Strong Shock Waves (81) Superposition of Plane Shock Waves (81-2) ... 

The power required to levitate an oil drop as its size parameter is varied by tuning the dye laser wavelength is shown in the lower curves of Fig. 11.11. The calculated radiation pressure efficiency (plotted as 1 /QpT) is shown in the middle curve and Qext in the upper curve the refractive index m = 1.47 + 110—6 is approximately constant over the small wavelength interval. This figure is taken from Chylek et al. (1978b), who identified the peaks in the upper curve. Curve a of the experimental results is for values of x calculated from the drop size determined microscopically with an accuracy of 5%. The ripple structure... 

When a steam pump is used, the pressure of the steam in pounds per unit area times the area of the piston would be the maximum force that could be exerted on the work-delivery piston if the machine were perfect and no friction were involved. However, friction is involved and work must be done on the liquid (or work-receiving fluid) under conditions in which the steam pressure is a finite amount greater than the liquid pressure. The ratio of the pressure theoretically required on the steam piston to the pressure actually exerted by the steam is known as the pressure efficiency or steam-end efficiency. It includes the effects of piston and rod friction, momentum changes in acceleration of the piston and fluid, and leakage of fluid past the piston. The pressure efficiency varies from about 50 percent for small pumps up to 80 percent for large pumps. 

Release agents are used to protect the steel mold from the molten aluminum. They provide lubrication and protection of the mold surface even under pressure. Efficient demolding of the... 

Manomeiric Efficiency or pressure efficiency is the pressure developed by the fan divided by the pressure against a plane surface due to a velocity equal to the peripheral speed of the fan wheel. M == glllCi. Manometric efficiency is defined by some engineers as 2gH/Ci. ... 

Sample introduction is at atmospheric pressure. Efficiency is poor (5% of sample into plasma rest to waste using conventional nebulizer)... 

As hospitals do not possess appropriate measuring devices, which would enable measuring pressure on the scar exerted by the textile garment, the pressure efficiency and the appropriate fittings are estimated subjectively for a particular case. 

CW Nd YAG (Aq = 1064 nm) laser power of 120 mW focused into a beam with wq 20 pm. The size variation of Mpith 7-37 pm/s was practically linear. It was also described rather weU by Eq. 1, where the optical pressure efficiency j2pr(e, p) was calculated using Mie theory. ... 

However, for automobile applications, H2 has to be highly pressurized due to space limitations. If the overall electrolysis plus pressurization efficiency is 70% to generate 700 bars H2, and the overall fuel cell system efficiency is 40%, then the entire electrolyzer-fuel cell system can achieve a well-to-wheel electrical efficiency of aroimd 28%. This is still about twice of the tank-to-wheel efficiency achieved by conventional internal combustion engines (ICEs). 

We see the reaffirmation of a known result, which is that storage at 700 bar pressure efficiencies have similar performances to those of cryogenic storage. The performances of the chemical hydride are not far behind either. 

Compressor jnd Drives Cen tri fu f al /ek c trie tiri Vt Carbon steei Discharge pressure = Efficiency = Power (shaft) = 3,1D8 kW MOC carbiin steel D-601 AfB (not shown on PPD) Electric/explosionpmof W =. 3200 kVV efficient... 

A meaningful way to compare tests at different scales or with different initial conditions is on the basis of the measured pressurization efficiency, r. This is defined as... 

A decrease in the initial containment pressure from 0.2 to 0.1 MPa did not produce a significant change in the containment loading. The pressurization efficiency was approximately the same while the pressure increase was less due to the lower atmosphere heat capacity in the lower pressure test. 

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