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Microfluidic devices capable of efficiently mixing two or more fluid are provided. Two or more microfluidic inlet channels defined in different sheets of material meet at an overlap region in fluid communication with an outlet channel. The channels are defined through the entire thickness of stencil

Microfluidic devices capable of efficiently mixing two or more fluid are provided. Two or more microfluidic inlet channels defined in different sheets of material meet at an overlap region in fluid communication with an outlet channel. The channels are defined through the entire thickness of stencil sheets. The overlap region may include an aperture-defining spacer layer, and/or an impedance element, such as a porous membrane, adapted to distribute at least one fluid across the entire width of the outlet channel to promote reliable fluid mixing.

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1. A microfluidic device comprising:a plurality of stacked, substantially planar sheets of material including a first stencil sheet, a second stencil sheet, a spacer sheet disposed between the first stencil sheet and the second stencil sheet, an upper cover sheet, and a lower cover sheet, each sheet

1. A microfluidic device comprising:a plurality of stacked, substantially planar sheets of material including a first stencil sheet, a second stencil sheet, a spacer sheet disposed between the first stencil sheet and the second stencil sheet, an upper cover sheet, and a lower cover sheet, each sheet having an upper surface, an opposing lower surface, at least one edge, and a thickness, wherein each sheet of the plurality of sheets is joined to at least one other adjacent sheet such that the plane of the joint is substantially parallel to the upper and lower surfaces of each sheet; a first microfluidic inlet channel for supplying a first fluid, the first inlet channel being defined through the entire thickness of the first stencil sheet; a second microfluidic inlet channel for supplying a second fluid, the second inlet channel being defined through the entire thickness of the second stencil sheet; and a microfluidic outlet channel disposed downstream of the first inlet channel and the second inlet channel, the outlet channel having a width; wherein the spacer sheet defines an aperture having a width greater than the width of the outlet channel; and wherein at least a portion of the first inlet channel overlaps at least a portion of the second inlet channel at the aperture, thus permitting fluid communication between the first inlet channel, the second inlet channel, and the outlet channel. 2. The device of claim 1 wherein the outlet channel is a substantially continuous extension of the second inlet channel and is defined through the entire thickness of the second stencil sheet.3. The device of claim 1, further comprising a third stencil sheet, wherein the outlet channel is defined through the entire thickness of the third stencil sheet.4. The device of claim 3, wherein the third stencil sheet is disposed between the first stencil sheet and the second stencil sheet.5. The device of claim 1 wherein at least one of the first inlet channel and the second inlet channel has a widened end adjacent to the aperture.6. The device of claim 1 wherein at least one sheet of the plurality of sheets comprises a polymeric material.7. The device of claim 1 wherein at least one sheet of the plurality of sheets comprises a polymeric material and is adhesivelessly joined to at least one other adjacent sheet.8. The device of claim 1 wherein at least one sheet of the plurality of sheets is joined to at least one other adjacent sheet with an adhesive.9. The device of claim 1 wherein at least one sheet of the plurality of sheets comprises a self-adhesive tape material having a carrier layer and an adhesive layer.10. The device of claim 1 wherein at least one of the upper cover sheet and the lower cover sheet defines a first fluid inlet port in fluid communication with the first inlet channel and a second fluid inlet port in fluid communication with the second inlet channel.11. The device of claim 1 wherein the first stencil sheet comprises a first material, the spacer sheet comprises a second material, and the first material is different from the second material.