Permeability Constant of Fiber Assembly

Drag problems of fluid flow passing through fiber assembly which was made of short copper coils were studied experimentally. For the flow in which Darcy's law is valid, linear relationship between pressure drop and mean velocity was obtained, and permeability constants and drag coefficient were decided from the relationship. The experimental results were compared with two theoretical curves deriving from the cell model method, the one is for assembly of spheres and the other for assembly of circular cylinders. It was found that the observed plots were distributed in the region bounded by two curves under the condition that the volume fraction range of porous material is 0.1 to 0.6.