Magnetic resonance velocity imaging of gas flow in a diesel particulate filter. (2nd February 2017)

• Record Type: Journal Article
• Authors: Ramskill, Nicholas P.; York, Andrew P.E.; Sederman, Andrew J.; Gladden, Lynn F.
• Is Part Of: Chemical engineering science. Volume 158 (2017)
• Page Start: 490
• Page End: 499
• Publication Date: 2017-02-02
• Subjects: Diesel particulate filter -- Particulate matter -- Gas flow -- Magnetic resonance velocity imaging; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2016.10.017
• Languages: English
• ISSNs: 0009-2509

Abstract

Abstract: Magnetic resonance (MR) velocity imaging has been used to investigate the gas flow in a diesel particulate filter (DPF), with sulphur hexafluoride (SF6 ) being used as the MR-active gas. Images of the axial velocity were acquired at ten evenly spaced positions along the length of the filter, for three flow conditions corresponding to Reynolds number of Re = 106, 254 and 428 in the filter channels. From the velocity images, averaged axial and through-wall velocity, as a function of position along the length of the filter, have been obtained. These experimentally obtained velocity profiles are analysed and a qualitative comparison with the results of previously reported numerical simulations is made. The MR measurements were used in subsequent analysis to quantify the uniformity of the through-wall velocity profiles. From this it was observed that for higher Re flows, the through-wall velocity profile became less uniform, and the implications that this has on particulate matter deposition are discussed. The MR technique demonstrated herein provides a useful method to advance our understanding of hydrodynamics and mass transfer within DPFs and also for the validation of numerical simulations used in their design and optimization. Graphical abstract: Highlights: Magnetic resonance velocity imaging has been used to study gas flow in a DPF. Profiles of the average the axial and through-wall velocity are obtained. The uniformity of the through-wall flow field has been quantified. The implication for particulate matter deposition is discussed. Comparisons with flow fields predicted using numerical models are made.