Contoured honeycomb bodies
AssigneeCorning Incorporated
InventorsThorsten Rolf Boger, Ameya Vinay Joshi, Konstantin Vladimirovich Khodosevich, Kunal Upendra Sakekar, Edward Zhmayev
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Abstract
Engine exhaust gas treatment article comprising a contoured honeycomb body (300) including a contoured outlet end face (316) are disclosed. Also disclosed are methods of manufacturing an engine exhaust gas treatment article.
Claims30
An engine exhaust gas treatment article comprising:
- a honeycomb body comprising a longitudinal axis, a maximum axial length, a minimum axial length, a plurality of channel walls extending from an inlet end face to an outlet end face defining cell channels therebetween, and a radial area perpendicular to the longitudinal axis, and an outer periphery extending from the inlet end face to the outlet end face, wherein at least one of the inlet end face and the outlet end face of the honeycomb body includes a contour surface that provides a uniform exhaust gas residence time across the radial area of the honeycomb body perpendicular to the longitudinal axis that yields a reduction of at least 20% in a ratio of maximum residence to minimum residence of substrate that has flat surfaces on both ends when exhaust gas is flowed through the honeycomb body.
A method of manufacturing an engine exhaust gas treatment article, the method comprising:
- shaping a honeycomb body comprising a longitudinal axis and a plurality of channels having an inlet end and an outlet end, each channel having a length and a hydraulic diameter and configured to receive a portion of the engine exhaust at an exhaust viscosity and an average exhaust velocity;
- determining a local channel exhaust gas velocity in the channel for at least a subset of said plurality of channels, the local channel exhaust gas velocity based on the length of the channel, the hydraulic diameter of the channel, the exhaust viscosity and an exhaust gas pressure drop across the length of the channel;
- determining a proportionality constant to account for a change in the local channel exhaust gas velocity in the channel based on a change in the channel length and to yield a new local channel exhaust gas velocity;
- and
- selecting a new channel length based on a deviation between the new local channel exhaust gas velocity and the average exhaust velocity so as to provide a more-uniform residence time of the engine exhaust in the channel, based on the residence time of the engine exhaust in other channels in the honeycomb body.
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A method of manufacturing an engine exhaust gas treatment article, the method comprising:
- shaping a honeycomb body a honeycomb body comprising a longitudinal axis, a maximum axial length, a minimum axial length, a plurality of channel walls extending from an inlet end face to an outlet end face defining cell channels therebetween, and a radial area perpendicular to the longitudinal axis, and an outer periphery extending from the inlet end face to the outlet end face, wherein at least one of the inlet end face and the outlet end face of the honeycomb body includes a contour surface that provides a uniform exhaust gas residence time across the radial area of the honeycomb body that yields a reduction of at least 20% in the ratio of maximum residence to minimum residence of substrate that has flat surfaces on both ends when exhaust gas is flowed through the honeycomb body.
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Dependencies are inferred from the claim text.