The present invention relates to a system preferably being an exhaust system or a part of a system such as a part of an exhaust system for a combustion engine. The system or the part of the system comprising a pipe (1) through which a fluid, such as exhaust gasses, flows; a nozzle (3) adapted to atomize a liquid, being disposed. to crystallize as a result of contact with the fluid and adapted to introduce the liquid through one or more outlets into the pipe (1). The nozzle (3) being arranged so that the region being sprayed and/or the mixing region in which a mixing between the liquid being atomized by the nozzle and the fluid flowing in the pipe occur is/are flushed by fluid flowing through the pipe.