US Patent 7533585 Dilution device

A dilution device includes an inlet port and an outlet port. The dilution device also includes a first porous conduit defining an internal flow passage. The first porous conduit has a plurality of pores that communicate between an outside region external of the first porous conduit and the internal flow passage. The dilution device also includes a second porous conduit disposed around the first porous conduit. The second porous conduit defines a first chamber peripherally about the first porous conduit. The second porous conduit has a plurality of pores that communicate between an outside region external of the second pours conduit and the first chamber. The dilution device further includes a housing disposed around the second porous conduit. The housing defines a second chamber peripherally about the second porous conduit. The housing has an inlet port in communication with the second chamber. The first porous conduit includes a port at a first end of the first porous conduit in communication with the second chamber.