NOVELTY - A cell unit (10) of mixed reactant fuel cell comprises electronically conductive distributor (14) for flowing through multiphase mixed reactant fluid having fuel and oxidant each in separate fluid phases; anode (12) and cathode (16) each in fluid and electronic communication with distributor, where the distributor extends between respective superficial electrode surfaces of anode and cathode such that bulk mixed reactant fluid flows through distributor and by superficial electrode surfaces under conditions that produce positive net potential of fuel cell under load.    USE - As cell unit of mixed reactant fuel cell.    ADVANTAGE - The cell unit allow for fuel cell designs that are of lower cost with reduced system complexity, and provide for the manufacture of thinner and lighter fuel cell stacks with the potential for greater volumetric power densities over conventional bipolar fuel cell stacks.    DETAILED DESCRIPTION - A cell unit (10) of mixed reactant fuel cell comprises electronically conductive distributor (14) for flowing through multiphase mixed reactant fluid having fuel and oxidant each in separate fluid phases, where at least one of the fuel and oxidant fluid phases is liquid; anode (12) and cathode (16) each in fluid and electronic communication with the distributor, where capillary pressure at the anode is selected to produce higher hold up of the fuel fluid phase than the oxidant fluid phase in the pores of the anode when the mixed reactant fluid flows through the distributor thus suppressing transfer of oxidant to the anode from the distributor or capillary pressure at the cathode is selected to produce higher hold up of the oxidant fluid phase than the fuel fluid phase in the pores of the cathode when the mixed reactant fluid flows through the distributor, thus suppressing transfer of fuel to the cathode from the distributor; or both; and separator (18) positioned relative to one of the anode and the cathode to provide electronic insulation and ionic communication between the cell unit and another adjacent cell unit; where the distributor extends between respective superficial electrode surfaces of the anode and cathode such that the bulk mixed reactant fluid flows through the distributor and by the superficial electrode surfaces under conditions that produce positive net potential of the fuel cell under load. An INDEPENDENT CLAIM is included for a mixed reactant fuel cell comprising an electronically conductive first distributor for flowing through a multiphase mixed reactant fluid having fuel and oxidant each in separate fluid phases, where at least one of the fuel and oxidant fluid phases is liquid; anode in fluid and electronic communication with first distributor electronically conductive second distributor for flowing through the multiphase mixed reactant fluid; cathode in fluid and electronic communication with the second distributor; and separator positioned between anode and cathode to provide electronic insulation and ionic communication there-between; where capillary pressure at the anode is selected to produce higher hold-up of the fuel fluid phase than the oxidant fluid phase in pores of the anode when the mixed reactant fluid flows through the distributor thus suppressing transfer of oxidant to the anode from the distributor; or capillary pressure at the cathode is selected to produce higher hold-up of the oxidant fluid phase than the fuel fluid phase in pores of the cathode when the mixed reactant fluid flows through the distributor, thus suppressing transfer of fuel to the cathode from the distributor, or both.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of components of mixed reactant flow by fuel cell.    Cell unit (10)    Anode (12)    Electronically conductive distributor (14)    Cathode (16)    Separator (18)