Home > Publications database > Sampling characteristics of inlets operated at low U/U_O ratios: new insights from computational fluid dynamics (CFX) modeling > print

001     31559
005     20240709074401.0
024 7 _ |2 DOI
|a 10.1016/j.jaerosci.2003.11.011
024 7 _ |2 WOS
|a WOS:000222167000002
037 _ _ |a PreJuSER-31559
041 _ _ |a eng
082 _ _ |a 530
084 _ _ |2 WoS
|a Engineering, Chemical
084 _ _ |2 WoS
|a Environmental Sciences
084 _ _ |2 WoS
|a Meteorology & Atmospheric Sciences
100 1 _ |a Krämer, M.
|b 0
|u FZJ
|0 P:(DE-Juel1)129131
245 _ _ |a Sampling characteristics of inlets operated at low U/U_O ratios: new insights from computational fluid dynamics (CFX) modeling
260 _ _ |a Amsterdam
|b Elsevier
|c 2004
300 _ _ |a 683 - 694
336 7 _ |a Journal Article
|0 PUB:(DE-HGF)16
|2 PUB:(DE-HGF)
336 7 _ |a Output Types/Journal article
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336 7 _ |a Journal Article
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336 7 _ |a ARTICLE
|2 BibTeX
336 7 _ |a JOURNAL_ARTICLE
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336 7 _ |a article
|2 DRIVER
440 _ 0 |a Journal of Aerosol Science
|x 0021-8502
|0 3000
|v 35
500 _ _ |a Record converted from VDB: 12.11.2012
520 _ _ |a Belyaev and Levin (Journal of Aerosol Science, 5 (1974) 325) (B&L) empirically derived a function for aspiration efficiencies A of thin-walled inlets operated at low velocity ratios U/U-0 (U flow velocity inside the inlet, U-0 velocity of the free flow). This function, which is especially applicable for particle sampling on fast, high-altitude aircraft, has not been experimentally or theoretically verified.By means of the computational fluid dynamics model (CFX), we evaluate this B&L function by explicitly determining inlet aspiration efficiencies over a wide range of high-altitude airborne applications. We find good agreement in the range where B&L performed their measurements (U/U-0 = 0.18-0.2, particle Stokes numbers Stk > 0.1), but for lower U/U-0 and smaller Stk the B&L function deviates from the CFX results. Therefore, we provide here a modified B&L function covering the ranges U/U-0 = 0.007-0.2 and Stk > 0.001:A(Stk) = (a Stk + b)/(a Stk + 1 + b) (U-0/U) + c(U/U-0) a = 1.26, b = 0.27, c = 0.50, (a) U/U-0 < 0.2, (b) Stk > 0.001.In addition, we used CFX to analyze the performance of a short inlet and demonstrate the strong sensitivity of the sampling characteristics to the inlet design, i.e. the particle transmission efficiency changes from zero for a standard inlet to 30% for a short inlet and the aspiration efficiencies of smaller particles are lower by approximately a factor of two when sampled with the short in comparison to the standard inlet. (C) 2003 Elsevier Ltd. All rights reserved.
536 _ _ |a Chemie und Dynamik der Geo-Biosphäre
|c U01
|2 G:(DE-HGF)
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588 _ _ |a Dataset connected to Web of Science
650 _ 7 |a J
|2 WoSType
653 2 0 |2 Author
|a inlet aspiration efficiencies
653 2 0 |2 Author
|a low U/U-0 ratios
700 1 _ |a Afchine, A.
|b 1
|u FZJ
|0 P:(DE-Juel1)129108
773 _ _ |a 10.1016/j.jaerosci.2003.11.011
|g Vol. 35, p. 683 - 694
|p 683 - 694
|q 35<683 - 694
|0 PERI:(DE-600)1499134-2
|t Journal of aerosol science
|v 35
|y 2004
|x 0021-8502
856 7 _ |u http://dx.doi.org/10.1016/j.jaerosci.2003.11.011
909 C O |o oai:juser.fz-juelich.de:31559
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913 1 _ |k U01
|v Chemie und Dynamik der Geo-Biosphäre
|l Chemie und Dynamik der Geo-Biosphäre
|b Environment (Umwelt)
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914 1 _ |y 2004
915 _ _ |0 StatID:(DE-HGF)0010
|a JCR/ISI refereed
920 1 _ |k ICG-I
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|d 31.12.2006
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981 _ _ |a I:(DE-Juel1)ICE-4-20101013
981 _ _ |a I:(DE-Juel1)IEK-7-20101013

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