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Angaben zur Quelle [Bearbeiten]

Autor     Gwon Hyun Ko, HongSun Ryou
Titel    Droplet collision processes in an inter-spray impingement system
Zeitschrift    Journal of Aerosol Science
Datum    November 2006
Jahrgang    36
Nummer    11
Seiten    1300-1321
DOI    10.1016/j.jaerosci.2005.02.005

Literaturverz.   

yes
Fußnoten    yes
Fragmente    2


Fragmente der Quelle:
[1.] Analyse:Jem/Fragment 209 19 - Diskussion
Zuletzt bearbeitet: 2014-07-01 12:50:02 Graf Isolan
Fragment, Jem, Ko and Ryou 2005, SMWFragment, Schutzlevel, Verschleierung, ZuSichten

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Quelle: Ko and Ryou 2005
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However, there are at least three limitations in the Fluent model. The first is that the Fluent model assumes that a given parcel may collide with another parcel only if these two parcels lie in the same computational cell. As indicated by Schmidt and Rutland (2000) and Nordin (2001), this assumption may be inappropriate. Under this assumption, the collision between two spatially very close parcels is a priori ignored if they reside in different computational cells. Contrary to this, the collision may occur for a pair of possibly far distant parcels in the same computational cell. As a result, the collision model strongly depends on the computational cell sizes. The second limitation is linked with non-uniformity of the spatial distribution of parcels in the domain. Aneja and Abraham (1998) indicated that the Fluent approach is not suitable for sprays, where the variation in number density is large even inside one cell. Finally, the Fluent model considers only two collision regimes such as separation and [permanent coalescence.]

Aneja, R. and J. Abraham (1998). How far does the liquid penetrate in a Diesel engine: computed results vs. measurements? Combust. Sci. and Tech. 138, pp. 233-255.

Nordin, P.A.N. (2001). Complex Chemistry Modeling of Diesel Spray Combustion. Ph.D. Thesis, Chalmers University of Technology, Sweden.

Schmidt, D.P. and C.J. Rutland (2000). A new droplet collision algorithm. Journal of Computational Physics 164, pp. 62-80.

However, there are at least three limitations in the O’Rourke model. The first is that the O’Rourke model assumes that a given parcel may collide with another parcel only if these two parcels lie in the same computational cell. As indicated by Gavaises (1997) recently, this assumption may be inappropriate. Under this assumption, the collision between two spatially very close parcels is a priori ignored if they reside in different computational cell. Contrary to this, the collision may occur for a pair of possibly far distant parcels in the same computational cell. As a result, the collision model strongly depends on the computational cell sizes. The second limitation is linked with the ignorance of the preferred directional effects of droplets. Nordin (2000) has indicated that the O’Rourke’s approach is not suitable for sprays, where the variation in void fraction is large even inside one cell and the parcels have the so-called ‘preferred directions’. [...] Finally, the O’Rourke model considers only three collision regimes such as separation, permanent coalescence, and grazing bounce.

Gavaises, M. (1997). Modeling of diesel fuel injection processes. Ph.D. thesis, Imperial College of Science and Technology and Medicine, Department of Mechanical Engineering, University of London.

Nordin, N. (2000). Complex chemistry modeling of diesel spray combustion. MS. thesis, Chalmers University of Technology, Sweden.

Anmerkungen

Not marked as a citation. Interestingly enough, although the model used is different, the text is mostly taken verbatim. At the end the text modifications needed to become more massive.

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(Graf Isolan)

[2.] Analyse:Jem/Fragment 210 01 - Diskussion
Zuletzt bearbeitet: 2014-07-01 13:00:32 Graf Isolan
Fragment, Jem, Ko and Ryou 2005, SMWFragment, Schutzlevel, Verschleierung, ZuSichten

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Quelle: Ko and Ryou 2005
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In the separation regime the colliding droplets loose only their momentum, but retain their sizes after impact. As referred by Georjon and Reitz (1999), this could lead to an overprediction of the coalescence phenomenon because the collision-induced breakup process is ignored.

Georjon, T.L. and R.D. Reitz (1999). Drop-shattering collision model for multidimensional spray computations. Atomization and Sprays 9, pp. 231-254.

Moreover, even in the separation regime, the colliding droplets lose only their momentum, but retain their sizes after impact. As referred by Bai (1996), the O’Rourke model could lead to an over-prediction of the coalescence phenomenon because the collision-induced breakup processes are ignored.

Bai, C. (1996). Modeling of spray impingement processes. Ph.D. thesis, Imperial College of Science and Technology and Medicine, Department of Mechanical Engineering, University of London.

Anmerkungen

Nothing has been marked as a citation. Continues from previous page (see Jem/Fragment_209_19). Again some adaptation to the model at hand has taken place

Sichter
(Graf Isolan)

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