A glass manufacturing apparatus includes a first nozzle including a first orifice facing a travel path. The glass manufacturing apparatus includes a gas source in fluid communication with the first nozzle, with the gas source directing a gas flow to the first nozzle. The glass manufacturing apparatus includes a controller coupled to one or more of the gas source or the first nozzle to vary the gas flow from the gas source the first nozzle such that the first nozzle is discharges a series of gas bursts through the first orifice toward the travel path at a frequency within a range from about 10 Hz to about 45 Hz. A second nozzle is spaced apart from the first nozzle. The second nozzle includes a second orifice facing the travel path. The second nozzle discharges a continuous gas flow through the second orifice toward the travel path.