| 摘要 |
A device for mass transfer between fluids by means of a pressure gradient and/or concentration gradient comprises a first support fleece (21), a first membrane (5), a flow-dividing element (6) in the form of a fluid-tight foil embossed with protrusions (6'), a second membrane (7) and a second support fleece (22). These five layers are pleated together into a folded packet and are enclosed in a housing (4) in such a manner that, with the aid of sealing beads (8) in the region of the end faces of the packet, three separate flow chambers (I, II, III/III') are formed. The fleeces (21, 22) are slightly compressible and have generally planar surfaces supporting the membranes (5, 7). Under the pressure in the third flow chamber (III/III'), the fleeces (21, 22) are slightly compressed so that the flow dividing element (6) is freed from contact with the membranes (5 and 7) thereby to allow laminar fluid flow over the protrusions (6'). <IMAGE> |
