| Autor: |
Watling, Timothy C., Van Lishout, Yolanda, Rees, Ian D. |
| Zdroj: |
Emission Control Science and Technology; 20210101, Issue: Preprints p1-18, 18p |
| Abstrakt: |
Backpressure prediction for flow-through monoliths (FTMs) and particulate filters (PFs) has been investigated. Backpressure data for model validation was measured as a function of part length by progressively shortening the parts. The experimental setup has fixed pressure at the inlet and zero exit pressure change, so varying the length of an FTM is equivalent to measuring the pressure along the channels, enabling separation of along-channel and entrance contributions to backpressure. With PFs, the PF becomes a partial PF after the first cut; testing in both orientations doubles the available data. Full and partial PFs are governed by the same differential equations, so this partial PF data can be used to validate the balance equations of a full PF. CFD results for a channel with an upstream contraction were also used for model validation. Equations for predicting the pressure drop due to flow contraction into the part are developed and validated. How to combine equations for pressure drop due to flow contraction and that along channels to give an accurate backpressure prediction for an FTM is considered. The length-varying technique enables different models proposed for PFs to be discriminated against. An approach for including the effect of developing flow in PFs is proposed; this includes a definition for dimensionless length for PFs, which is validated against literature CFD results. |
| Databáze: |
Supplemental Index |
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