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Extra resources for Digital Satellite Equipment Control(DiSEqC)Bus Functional Specification v4.0

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All these dimensions may change at different radii from the impeller hub. Fig. 1 1 Blade Cross Section Blade areas can also be calculated based on projected, developed, or expanded width. When projected area, corrected for overlapping blades and the additional area of the impeller hub, is compared with the swept area of the rotating impeller, an impeller solidity can be calculated. Solidity is often used as a general quality describing blade width and number of blades. Beyond the manufacturer’s designation of the impeller, number of blades, impeller diameter, hub angle, developed width at the tip, and cord angle at the tip should be recorded as a minimum.

Care must be taken to select a property that is not affected by other system changes and that varies enough so that experimental error does not significantly affect the results. 5 Other PhysicaVChemicafProperties Many physical or chemical property measurements are possible. Sometimes, any of the following parameters might be important: Interfacial tension or surface tension, specific heat, thermal conductivity, boiling point, melting point, latent heat of vaporization or fusion, heat of reaction, heat of mixing, molecular weight, or mass difiivity.

6 Thrust Number, T h = 4 h gc p N 2 D4 where F,,,is impeller thrust. The ratio of imposed forces to inertial forces. 1 Weber Number, N 2D 3 p We = =g c where c is surface tension. The ratio of inertial forces to surface tension forces. 2 Nusselt Number, hD NU = k The ratio of convective heat transfer rate to conductive heat transfer rate. 3 Prandtl Number, Pr = cP - k The ratio of momentum transfer rate to heat transfer rate. 4 Blend Time Number, 0 = tbred N where tblend is the blend time. A numerical subscript on the blend time may be used to clearly defrne the degree of uniformity of a blend.

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Digital Satellite Equipment Control(DiSEqC)Bus Functional Specification v4.0


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