Aerosol-generating article comprising an aerosol-cooling element with an elongated protrusion

An aerosol-generating article for producing an aerosol upon heating, the aerosol-generating article comprising:

• a rod of aerosol-generating substrate;
• an aerosol-cooling element, positioned downstream of the rod of aerosol-generating substrate, the aerosol-cooling element comprising a hollow tubular segment comprising a peripheral wall, the hollow tubular segment extending along a longitudinal axis and having a downstream end in fluid communication with an upstream end, wherein the hollow tubular segment further comprises at least one elongated protrusion extending from the peripheral wall into an interior of the hollow tubular segment, the at least one elongated protrusion extending longitudinally from an upstream position on the peripheral wall to a downstream position on the peripheral wall downstream of the upstream position;
• and
• a wrapper circumscribing the rod of aerosol-generating substrate and the aerosol-cooling element,
• wherein the at least one elongated protrusion is a deflecting fin configured to change a direction of flow of an aerosol flowing from the upstream end to the downstream end of the hollow tubular segment, and
• wherein the deflecting fin is twisted along a length of the hollow tubular segment.