Apparatus and methods for testing a honeycomb filter

A method of testing a honeycomb filter comprising the steps of:

• (I) providing a honeycomb filter including a first end portion and a second end portion along an axis of the honeycomb filter, the honeycomb filter including honeycomb network of channels defined by a plurality of intersecting walls, wherein the honeycomb network of channels extend along the axis of the honeycomb filter between the first end portion and the second end portion;
• (II) flowing a fog with moisture droplets into the honeycomb network of channels at the first end portion of the honeycomb filter;
• (III) monitoring the second end portion of the honeycomb filter for moisture droplets of the fog exiting the honeycomb network of channels;
• and
• (IV) blocking a flow of fog through inner peripheral channels to enhance the flow of fog through the outer peripheral channels of the honeycomb network of channels.

An apparatus for testing a honeycomb filter comprising:

• a fog generating device configured to generate a fog including moisture droplets;
• and
• a flow diverter comprises a blocking member configured to engage a central portion of an end of the honeycomb filter to enhance the flow of fog from the fog generator through outer peripheral channels of the honeycomb filter,
• wherein the blocking member is configured to block the flow of fog to the central portion of the end of the honeycomb filter.