Length-to-width ratio

Typical textile fibers used, for example, in a needle-punched filter fabric, are a blend of 3.3- and 6.6-dtex (3- and 6-denier) polyester staple. These fibers are - 5 cm long, have diameters ranging from 18 to 25 pm, mass-per-unit-length or linear density values ranging from - 350 to 650 mg per 1000 m, and length-to-width ratios in the order of 1000 to 1. 

Screen-cloth specifications having a relatively large length-to-width ratio are desirable when moisture or sticky material tends to cause blinding with square or short rectangular openings. 

We wish to separate titanium dioxide particles from a water suspension. The method chosen is centrifugation. The unit is a continuous solid-bowl type with a bowl diamter of 400 mm, a length to width ratio of 3.0, and the unit operates at 2,000 rpm. The feed contains 18 % (weight basis) solids and is fed to the unit at 2,500 Liters/hr at a temperature of 95° F. The average particle size is 65 /tm. (a) Determine the amount of solids recovered per hour (b) Determine the solids concentration in the centrate (c) Determine the horsepower requirments for the centrifuge (d) Size a graviy settler to remove an additional 15 % of the solids. 

Extensive review of equations for centerline velocities in flows in the vicinity of realistic hoods resulting from experimental and theoretical studies was performed by Braconnier, This review shows certain inconsistencies in equations available from the technical literature due to effects of parameters related to opening (shape, length-to-width ratio, presence of a flange) and the opening location (in an open space or limited by surfaces). The. summary of equations from this review complemented by information from Posokhin is presented in Tables 7.2.5 and 7.26. 

Pipes and Cole [2-25] measured the interaction term F,2 in various off-axis tests for boron-epoxy. They reported significant variation of F,2 for off-axis tension tests and acceptable variation for off-axis compression tests. However, compression tests are much more difficult to perform than simple off-axis tension tests on a flat specimen with a high length-to-width ratio. A compression specimen with a high length-to-... 

Figures 2 through 9 are design charts for ultraviolet stabilized polycarbonate under blast load. Charts are provided for pane thicknesses of 1/4, 3/8, 1/2, and 1 inch for pane areas up to 25 ft at pane aspect ratios (pane length to width ratios) of 1.00, 1.50, 2.00 and 4.00. The charts relate the peak experienced blast overpressure capacity, B, for convenient pane dimensions across the spectrum of encountered blast durations. Depending on the orientation of the window to the charge, the blast overpressure may either be incident or reflected. The pane dimensions (measured across the span from the gasket centerline) peak blast capacity at 1000 msec, B, static frame design pressure, r, and the required bite are printed to the right...

The membranes in electrodialysis stacks are kept apart by spacers which define the flow channels for the process feed. There are two basic types(3), (a) tortuous path, causing the solution to flow in long narrow channels making several 180° bends between entrance and exit, and typically operating with a channel length-to-width ratio of 100 1 with a cross-flow velocity of 0.3-1.0 m/s (b) sheet flow, with a straight path from entrance to exit ports and a cross-flow velocity of 0.05-0.15 m/s. In both cases the spacer screens are... 

Figure 4. Hot plasticity of sulfide inclusions during hot rolling of steel as a function of oxygen content, Mn/S ratio, rolling temperatures, and substitution by stronger sulfide formers. The hot plasticity is measured in length-to-width ratio of elongation after hot rolling, in longitudinal sections.

LWR length-to-width ratio ZPL zero-phonon line... 

Very thin conductive layers are deposited on an insulating substrate and large length-to-width ratios are obtained by etching a suitable pattern. 

In order to evaluate the order of magnitude of the power Pe dissipated in the electrode, a value is required for Re in Eq. (5.27). Because Rc = pj/w, where l/w is the length-to-width ratio, and / vv, then Rc ps. Therefore it follows that... 

The stomata represent the primary sites for gas exchange. Data for one clone (Table 4.2) indicate that the size of stomata are essentially the same between the adaxial (343 pm2) and abaxial (323 pm2) surfaces however, their shape varies, with lower stomata being rounder (1.3 1 length-to-width ratio) than those of the upper surface, which are more oval (1.6 1). The data represent only one clone and may not be indicative of the variation over the entire leaf surface of the plant. 

Figure 7.3 shows theoretical impactor performance when a number of parameters are varied, including jet-to-plate spacing, jet Reynolds number, and throat length-to-width ratio. These curves indicate that impactor efficiency is fairly insensitive to Reynolds number in the range 500 < Re < 3000 and that impactor efficiency is also relatively independent of S/W and T/W ratios, except for small values of S/W. 

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