The dependence of pressure drop across a model filter on the Knudsen number has been studied experimentally and theoretically for a simplest fiber filter model-a system of parallel cylinders arranged perpendicular to the flow. It has been shown that the reciprocal value of the drag on the fibers increased linearly with the Knudsen number. © 1971.
Kirsh, A. A., Stechkina, I. B., & Fuchs, N. A. (1971). Effect of gas slip on the pressure drop in a system of parallel cylinders at small reynolds numbers. Journal of Colloid And Interface Science, 37(2), 458–461. https://doi.org/10.1016/0021-9797(71)90314-6