# Analyse:Jem/Fragment 007 12

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Often an average droplet diameter djk is taken to represent a spray. A general mean diameter is (Lefebvre, 1989)

$d_{jk} = \left[\frac{\int_0^\infty d^j n(d) {\rm d}d}{\int_0^\infty d^k n(d) {\rm d}d}\right]^{1/(j-k)} = \left[ \frac{m_j}{m_k}\right]^{1/(j-k)} \quad$ (1.7)

An example is the Sauter mean diameter (SMD) d32, which is proportional to the ratio of the total liquid volume to the total droplet surface area.

Lefebvre, A.H. (1989). Atomization and Sprays. Hemisphere, New York.

Often an average droplet diameter dmn is taken to represent a spray. In particular,

$d_{mn} = \frac{\int_0^\infty f(d) d^m \, {\rm d}d}{\int_0^\infty f(d) d^n \, {\rm d}d}. \quad$ (1.1)

[...] One example of an average droplet is the Sauter mean diameter d32, which is proportional to the ratio of the total liquid volume in a spray to the total droplet surface area in a spray.

 Anmerkungen No part of this has been marked as a citation. In the original text this piece belonged together with the passage used in Jem/Fragment_005_04. Sichter (Graf Isolan)

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