Patent ID: 7147215

Claim:
An apparatus which may be used for treating a fluid in a packing module comprising a corrugated strip of sheet material, said strip further comprising: a) flow channels for said fluid; b) a spanning region wherein said channels define spanning peak/trough lines with a general direction (Di) substantially opposed to a general flow direction (Df) of said fluid; and c) at least one transition region located adjacent to said spanning region and further comprising: 1) said channels defining transition peak/trough lines with a direction that progressively approaches said general flow direction (Df) of said fluid; 2) a curve (A) that said transition peak/trough lines substantially follow, said curve tangentially extending from said spanning peak/trough lines; and 3) a radius of curvature (Rc) of said curve (A) that at any point is greater than about 1.5 times the hydraulic diameter (Dh) of said channel.