NOVELTY - Fuel directing reaction device comprises: a substrate which has a first side and a second side opposite to the first side; a fuel reservoir, which is disposed on the first side of the substrate; a fuel introducing microfluidic channel portion, which is disposed on the first side of the substrate and connected with the fuel reservoir; a first rib array portion, which is disposed on the first side of the substrate, and connected with the fuel introducing microfluidic channel portion; a second rib array portion; and many reaction holes.    USE - The fuel directing reaction device is useful in passive fuel cell (claimed) including direct-liquid fuel cell.    ADVANTAGE - The fuel directing reaction device: improves the fuel delivery velocity and uniformity of the fluid flow distribution; and removes gas products from the reaction holes thus obtaining highly efficient power generation.    DETAILED DESCRIPTION - Fuel directing reaction device comprises: a substrate which has a first side and a second side opposite to the first side; a fuel reservoir, which is disposed on the first side of the substrate; a fuel introducing microfluidic channel portion, which is disposed on the first side of the substrate and connected with the fuel reservoir, where the fuel introducing microfluidic channel portion can self-propel a fuel from the fuel reservoir by a capillary force; a first rib array portion, which is disposed on the first side of the substrate, and connected with the fuel introducing microfluidic channel portion, where the first rib array portion comprises many first ribs in an interlaced arrangement and each of which has a V-shaped portion with an open side toward the fuel introducing microfluidic channel portion; a second rib array portion, which is disposed on the first side of the substrate, and connected with the first rib array, where the second rib array portion comprises many second ribs in an interlaced arrangement and each has a V-shaped portion with an open side toward the first rib array portion; and many reaction holes, each of which is disposed on the open side of the V-shaped portion of the second ribs and extends through the substrate to connect the first side and the second side of the substrate.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a delivery and reaction zone having an interlaced V-shaped rib array.    Reaction zone (1)    V-shaped ribs (11)