Capsules with internal channels, heat-not-burn (HNB) aerosol-generating devices, and methods of generating an aerosol

A capsule for an aerosol-generating device, comprising:

• a housing defining inlet openings, outlet openings, and internal channels between the inlet openings and the outlet openings, the internal channels configured to hold an aerosol-forming substrate, the housing configured to facilitate a heating of the aerosol-forming substrate via conduction so as to generate an aerosol, the housing including a corrugated structure and a conductive cover, the corrugated structure having alternating ridges and furrows which, in combination with the conductive cover, defines the internal channels.