Specific diameter

The specific diameter compares head and flow rates in geometrically similar machines at various diameters... 

Centrifugal compressors in general are used for higher-pressure ratios and lower-flow rates compared to lower-stage pressure ratios and higher-flow rates in axial compressors. Figure 6-3 is a map for centrifugal compressors that shows the effect of specific speed (A ) and specific diameter (Z) ) on their... 

Viscosity is a measurement of resistance to flow. Although the unit of absolute viscosity is poise, its measurement is difficult. Instead, kinematic (flowing) viscosity is determined by measuring the time for a given flow through a capillary tube of specific diameter and length. The unit of kinematic viscosity is the stoke. However, in general practice, centistoke is used. Poise is related to stoke by the equation ... 

Today n-paraffms are exclusively produced from the corresponding distillation cuts of paraffin-rich oils with the use of molecular sieves. Molecular sieves are synthetically manufactured aluminum silicates of the zeolite type, which after dehydration have hollow spaces of specific diameters with openings of specific diameters. The molecules are then able to penetrate the openings in the correct size and form and are held in the hollow spaces by electrostatic or van der Waals forces. The diameter of the zeolite type used for the production of paraffins is 5 A and is refined so that the n-paraffins (C5-C24) can penetrate the hollow spaces while the iso- and cyclic paraffins are unable to pass through [15]. 

Figure 20 Plate revolutions simulated for varying spheronization times for three spheronizers of increasing scale from two manufacturers, A and B. Each simulation is at maximum recommended speed of operation. Each rpm in the legend for A or B represents a spheronizer of a specific diameter (scale).

Figure 7.2. Performance curves in dimensional and dimensionless forms (a) Data of a pump with a specific diameter and rotation speed, (b) Dimensionless performance curves of all pumps geometrically similar to (a). The dashed lines identify the condition of peak efficiency. (After Daugherty and Franzini, Fluid Mechanics with Engineering Applications, McGraw-Hill, New York, 1957).

Figure 7.25. Efficiency and head coefficient qad as functions of specific speeds and specific diameters of various kinds of impellers (Evans, 1979). Example An axial propeller has an efficiency of 70% at A, = 200 and Ds = 1.5 and 85% at Ns = 400 and Ds = 0.8. See Table 7.4 for definitions of qad, Ns, and Ds.

The wrapping of polymer ropes around MWCNTs occurs in a well-ordered periodic fashion [237]. The authors suggested that the polymer intercalated between the nanotubes, leading to unraveling of ropes and causing a decrease in interactions between the individual CNTs. Moreover, Raman and absorption studies suggested that the polymer interacts preferentially with CNTs of specific diameters or a specific range of diameters [238]. 

There is nothing magical about fluorocarbons or, specifically, the -(CF2) F group [2]. The -(CF2)MF is similar to -(CH2) H in many ways. These include dipole moments and polarizabilities that are related to intermolecular forces and, hence, surface tension. Where they do differ is in size, specifically diameter, and a relative comparison for a typical hydrocarbon and similar fluorocarbon surfactant is shown in Figure 6.54. 

In the previous section the evaporation rate of a droplet of a specific diameter was considered. But as the droplet evaporates, its diameter decreases. Since a large number of molecules are required to affect the droplet size significantly, a quasi-stationaiy condition can be assumed to crudely estimate the drying time, or lifetime, of the drop. Then... 

Manufacturer Fiber Typical Tensile Strain to Young s Specific Diameter... 

The nomenclature of the equations above is tj and t2 - temperature of fluid 1 and fluid 2 respectively, wj and W2 - mean velocities for hot and cold fluid, pj and p2 - fluid densities, Cpj and Cp2 - fluid sensible heats, d and D - specific diameters of the basic pipe and mantle of the heat exchanger, Uj and U2 - partial heat transfer coefficients around the basic pipe, 5p and Sp - thickness of the basic pipe and the mantle, Xp and Xp - thermal conductivities of the basic pipe and mantle walls, k and kg - total heat transfer coefficients, tg - external temperature of the heat exchanger. 

The Brinell hardness number is based on the indentation of the surface under test by a ball of specific diameter, usually 10 mm, when pressed into the test surface. It is usually expressed in kilograms/square millimeter, thus small numbers represent low hardness. 

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