| Abstract: | The retention of highly adherent fine particles in a fabric filter can cause a measurable difference in the forward and reverse air flow pressure drops. This difference, termed the check valve effect, results from the movement of aggregations or nodules of dust particles held by fibers on the surface or in the interstices of a fabric. The measurement of forward and reverse pressure drops is a useful method for determining the presence of nodules. Currently, we do not know of a simple way to prevent the formation of nodules nor to remove them easily once they form. However, we hope that in describing their effects, we may aid those individuals attempting to improve filter performance. |
