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An application of computational fluid dynamics (CFD) to the characterisation and optimisation of a cyclonic spray chamber for CP-AES
journal contribution
posted on 2008-01-21, 13:01 authored by Gerhard Schaldach, Harald Berndt, Barry SharpThis paper describes the application of computational fluid dynamics (CFD) to the modelling of the
performance of a cyclonic spray chamber with flow spoiler designed to provide good efficiency with rapid
wash-out time. The modelling is carried out under two flow regimes, one corresponding to typical sample
introduction conditions and one to low sample uptake. Velocity distributions, pressure distributions and mass
flows are simulated, the latter employing the measured primary aerosol distributions as inputs to the
computation. The dynamic performance of chambers is also modelled and the signal profiles produced are
shown to correspond to those derived directly from measurement. Six different chambers are studied
corresponding to a chamber with no spoiler, a single spoiler in four different positions, and a chamber with
3 spoilers. The position of the spoiler is shown to be critical in determining the flow field in the chamber and
hence the efficiency and washout time. It is demonstrated that chamber geometry has maximum impact under
low uptake conditions where the limited dispersion primary aerosol can effectively follow the gas flow lines.
Computation indicates that a chamber with optimised spoiler, operating under low uptake conditions, provides
the best combination of efficiency and response time. This was confirmed by experiment in which the
performance of 3 different chambers was compared, with the optimised design providing detection limits 1.5–
19 better than those obtained with the chamber supplied with the ICP-AES instrument. A chamber with
3 spoilers indicates the formation of a low-volume
History
School
- Science
Department
- Chemistry
Citation
SCHALDACH, G., BERNDT, H. and SHARP, B.L., 2003. An application of computational fluid dynamics (CFD) to the characterisation and optimisation of a cyclonic spray chamber for CP-AES. Journal of analytical atomic spectrometry, 18, pp. 742–750Publisher
© RSC PublishingPublication date
2003Notes
This article is Restricted Access. It was published in the journal, Journal of analytical atomic spectrometry [© RSC Publishing] and is available at: http://www.rsc.org/jaasISSN
0267-9477Language
- en