Fuel nozzle assembly for use in a turbine engine and methods of assembling same

A fuel nozzle assembly (34) for use with a turbine engine is described herein. The fuel nozzle assembly includes a plurality of fuel nozzles (38) positioned within an air plenum defined by a casing. Each of the plurality of fuel nozzles is coupled to a combustion liner (54) defining a combustion chamber. Each of the plurality of fuel nozzles includes a housing (84) that includes an inner surface that defines a cooling fluid plenum and a fuel plenum therein, and a plurality of mixing tubes (128) extending through the housing. Each of the mixing tubes includes an inner surface defining a flow channel extending between the air plenum and the combustion chamber. At least one mixing tube of the plurality of mixing tubes comprises at least one cooling fluid aperture for channeling a flow of cooling fluid from the cooling fluid plenum to the flow channel.