Abstract
Flow measurements are presented across an automotive catalyst monolith situated downstream of a
planar wide-angled diffuser. Particle Image Velocimetry (PIV) measurements were obtained in the
diffuser and the flow distribution within the monolith was obtained from hot wire anemometry (HWA)
at the monolith exit. Flow separation at the diffuser inlet resulted in the formation of a jet which
traversed the diffuser before spreading just prior to entering the monolith. The jet featured a potential
core and saddle-type velocity profiles. A free shear layer separated the jet core from two large
recirculation regions which developed in the diffuser narrowing the potential core. The flow field in the
main body of the diffuser was observed to be independent of Re in contrast to that within the monolith.
Increasing monolith length gave greater flow uniformity in the monolith as a consequence of jet
spreading. Comparing the axial velocity flow profiles ~ 3 mm upstream of the monolith to that
downstream showed that significant flow redistribution occurred as the flow entered the monolith
resulting in more flow entering peripheral channels. It is inferred that pressure loss arising from
oblique entry into monolith channels significantly affects the flow distribution within the monolith.
planar wide-angled diffuser. Particle Image Velocimetry (PIV) measurements were obtained in the
diffuser and the flow distribution within the monolith was obtained from hot wire anemometry (HWA)
at the monolith exit. Flow separation at the diffuser inlet resulted in the formation of a jet which
traversed the diffuser before spreading just prior to entering the monolith. The jet featured a potential
core and saddle-type velocity profiles. A free shear layer separated the jet core from two large
recirculation regions which developed in the diffuser narrowing the potential core. The flow field in the
main body of the diffuser was observed to be independent of Re in contrast to that within the monolith.
Increasing monolith length gave greater flow uniformity in the monolith as a consequence of jet
spreading. Comparing the axial velocity flow profiles ~ 3 mm upstream of the monolith to that
downstream showed that significant flow redistribution occurred as the flow entered the monolith
resulting in more flow entering peripheral channels. It is inferred that pressure loss arising from
oblique entry into monolith channels significantly affects the flow distribution within the monolith.
| Original language | English |
|---|---|
| Pages (from-to) | 797-801 |
| Journal | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science |
| Volume | 218 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 2004 |
Keywords
- hot-wire anemometry
- flow reversal