Methods and systems for destabilizing foam in equipment downstream of a submerged combustion melter

A method comprising:

• flowing a molten mass of glass and bubbles into an apparatus downstream of a submerged combustion melter, the downstream apparatus comprising a floor, a roof, and a wall connecting the floor and the roof, the downstream apparatus devoid of submerged combustion burners and other components that would increase turbulence of the molten mass, the molten mass having a foam layer on at least a portion of a top surface of the molten mass;
• and
• imposing a vibratory de-stabilizing force directly to the foam layer and to the molten mass wherein the imposing of the vibratory de-stabilizing force employs a vibration apparatus connected to the downstream apparatus via one or more connecting members, the one or more connecting member connected to one or more of the floor, the wall, and the roof of the downstream apparatus, the vibration apparatus imposing the vibratory de-stabilizing force having a frequency and amplitude to the molten mass and foam layer sufficient to de-stabilize bubbles in one or more portions or locations of the foam layer and cause at least some of the bubbles in the foam layer to break.