shape factor


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shape factor

[′shāp ‚fak·tər]
(electricity)
(electronics)
The ratio of the 60-decibel bandwidth of a bandpass filter to the 3-decibel bandwidth.
(fluid mechanics)
The quotient of the area of a sphere equivalent to the volume of a solid particle divided by the actual surface of the particle; used in calculations of gas flow through beds of granular solids.
(optics)
For a lens, the quantity (R2+ R1)/(R2-R1), where R1 and R2 are the radii of the first and second surface of the lens. Also known as Coddington shape factor.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Caption: FIG 2: The Impact of Shape Factor on Drag Flow: When the ratio of the channel depth to width (h/W) of a screw channel increases, there is a reduction in its drag flow.
The effect of the nanoparticle shape factor on the temperature profile of the nanofluid during the squeezing flow is shown in Figure 14.
Caption: Figure 6: The variation in the shape factor of the solid grains and the liquid fraction as a function of the temperature.
where S and N are the shape factor and stability parameter, respectively.
On the other hand, stitch density, loop shape factor, and take-up rate of knitted fabrics depend on wpc and cpc in addition to loop length, as shown in the results of this research.
Third, Figure 14 shows a nonlinear reduction of fictitious number of cycles to failure with increasing shape factor. This is reasonable.
(ii) The obtained coefficients, peak and shape factors, may be applied as potential benchmarks for the identification of electric arc purposes regardless of voltage value, and it may be crucial for diagnosis of electrical apparatus.
where [G.sub.c](s) = -(s[square root of -j]/4)([J.sub.1](s[square root of - j])/[J.sub.0](s[square root of -j]))/[l-(2 /s [square root of -J]) ([J.sub.1](s[square root of -j])/[J.sub.0](s[square root of -j]))] and s = c[(8[omega][[rho].sub.0][[alpha].sub.[infinity]]/[sigma][phi]).sup.1/2]; [[alpha].sub.[infinity]] is the tortuosity of the PFMM; [[rho].sub.0] is the static density of air; [sigma] is the static flow resistivity; [phi] is the porosity; [omega] is the angular frequency; and c is the shape factor. In (1), the value of static flow resistivity is usually measured but the relationship between the static flow resistivity and geometrical parameters of the PFMM cannot be revealed.
In Figure 7 we show average shape factor <[delta]> versus the number of segments out of channel s.
Shape factor ([lambda]): Shape factor based on volume & surface area of tomatoes was determined (McCabe and Smith, 1984) as;
Table 1--generally considered parameters Screw speed Barrel temperature settings Material feed rate Melt thermal homogeneity Viscosity Barrel diameter Core diameter Lead length Meter channel depth Channel width at the barrel Channel width at the screw core Average channel width Channel aspect ratio Total helical length of the metering section Flight width Flight start Helix angle at the barrel Helix angle at the screw core Shape factor for rotational flow Shape factor for pressure flow Others