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Mean beam length

L = mean beam length Eq, at vanishingly small optical thickness ... [Pg.570]

The fliix density to a small area of interest on the envelope of an emitter volume of any shape can be matched by that at the base of a hemispherical volume of some radius L, which is called the mean beam length. It is found that although the ratio of E to a characteristic dimension D of the shape varies with opacity, the variation is small enough for most engineering purposes to permit use of a constant ratio... [Pg.578]

TABLE 5-7 Mean Beam Lengths for Volume Radiation... [Pg.579]

Note that these values are specific to the subject problem in which the mean beam length is L, , with gS evaluated from basic data, such as Table 5-8. (1 — in Eq. (5-165) represents the emissivity of a gray gas, which will be called Ec,i. For later use, note that,... [Pg.583]

Table 9.7. Mean beam lengths for various geometries 54 ... Table 9.7. Mean beam lengths for various geometries 54 ...
Meadowcroft, D. B. 759,786 Mean beam length 466,468 ---------various geometries 468... [Pg.883]

For the box-shaped shell, the mean beam length L is approximated by... [Pg.216]

Using Table 8-2, we calculate the mean beam length as... [Pg.422]

B Dunkle, R. V. Geometric Mean Beam Lengths for Radiant Heat Transfer Calculations," J. Heat Transfer, vol. 86, p. 75, February 1964. [Pg.490]

Average and optically thin mean beam lengths, m... [Pg.17]

Surface absorptivity or absorptance subscript 1 refers to the surface temperature while subscript 2 refers to the radiation source Gas absorptivity, emissivity, and transmissivity Dimensionless constant in mean beam length equation, LM = (5-LM0... [Pg.17]

Mean Beam Lengths It is always possible to represent the emissivity of an arbitrarily shaped volume of gray gas (and thus the corre-... [Pg.31]

Eq. (5-169) reduces to simply SiG/Ai = Eg < 1.0, and it is evident that the magnitude of the radiation contribution never exceeds unity. At high temperatures, radiative effects can easily dominate other modes ofheat transfer by an order of magnitude or more. When mean beam length calculations are employed, use LM/D = 0.94 for a cylindrical cross section of diameter D, and... [Pg.40]

See other pages where Mean beam length is mentioned: [Pg.184]    [Pg.578]    [Pg.579]    [Pg.579]    [Pg.582]    [Pg.583]    [Pg.466]    [Pg.568]    [Pg.200]    [Pg.313]    [Pg.170]    [Pg.292]    [Pg.350]    [Pg.127]    [Pg.214]    [Pg.215]    [Pg.215]    [Pg.218]    [Pg.221]    [Pg.184]    [Pg.69]    [Pg.416]    [Pg.417]    [Pg.31]    [Pg.31]    [Pg.31]    [Pg.31]    [Pg.31]    [Pg.31]    [Pg.33]    [Pg.38]    [Pg.38]    [Pg.38]    [Pg.42]    [Pg.404]   
See also in sourсe #XX -- [ Pg.749 ]



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Emissivity mean beam lengths

Mean beam length various geometries

Mean beam lengths, table

Mean length

Radiation mean beam length

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