A nozzle device includes a nozzle body and at least one second electrode. The nozzle body extends along a longitudinal axis, and has a top surface, a bottom surface for confronting a first electrode of a workpiece, a recess provided in the bottom surface, and a longitudinal channel extending downwardly from the top surface along the longitudinal axis to be in fluid communication with the recess. The longitudinal channel has an upper section and a lower tapered section which is tapered downwardly to form a lower communication port. The least one second electrode is disposed in the recess for being spaced apart from the first electrode.