Ventilation for shisha device

1. A shisha device comprising:

an aerosol-generating element for receiving an aerosol-forming substrate;

the aerosol-generating element configured such that the temperature provided is sufficient to generate an aerosol without combusting or burning the aerosol-forming substrate;

a vessel spaced from the aerosol-generating element and defining an interior for housing a volume of liquid, the vessel comprising a head space outlet; and

an aerosol conduit positioned between the aerosol-generating element and the interior of the vessel, the aerosol conduit comprising:

a proximal end portion defining a proximal opening positioned to receive airflow from the aerosol-generating element;

a distal end portion defining a distal opening positioned in the interior of the vessel; and

a ventilation opening positioned between the proximal and distal end portions,

wherein the ventilation opening comprises one or more ventilation apertures and wherein the one or more ventilation apertures have a total aperture area;

wherein a ratio between the total aperture area of the ventilation opening and a transverse cross-sectional area of the aerosol conduit positioned proximate to the ventilation opening is at most 1:1000; and

wherein applying a negative pressure at the head space outlet causes airflow through the aerosol conduit from the proximal opening downstream to the distal opening and causes ambient air to flow from the ventilation opening, through the aerosol conduit, to the distal opening of the aerosol conduit.

2. The shisha device of claim 1 , wherein the ventilation opening comprises one or more:

a ambient air aperture.

3. The shisha device of claim 2 , wherein the aerosol conduit comprises a cooling element positioned proximate to the one or more ambient air aperture.

4. The shisha device of claim 3 , wherein the cooling element comprises an active cooling element.

5. The shisha device of claim 1 , wherein the aerosol conduit comprises an accelerating element positioned along the aerosol conduit and configured to accelerate aerosol that flows through the accelerating element.

6. The shisha device of claim 5 , wherein the accelerating element comprises one or more ventilation apertures of the ventilation opening.

7. The shisha device of claim 5 , wherein the accelerating element comprises a tapered portion and the ventilation opening is positioned in a relatively narrower end portion of the tapered portion of the accelerating element.

8. The shisha device of claim 1 , wherein the ventilation opening comprises one or more ventilation apertures forming a ring-shaped opening.

9. The shisha device of claim 1 , wherein the ventilation opening comprises a ventilation chamber in fluid communication with one or more ventilation apertures of the ventilation opening.

10. The shisha device of claim 9 , wherein the ventilation chamber comprises a vortex element.

11. The shisha device of claim 1 , wherein the aerosol conduit comprises a cooling element configured to cool aerosol that flows through the cooling element.

12. The shisha device of claim 11 , wherein the cooling element defines at least one of an ambient air aperture of the ventilation opening and a ventilation chamber adjacent to a ventilation aperture of the ventilation opening.

13. The shisha device of claim 1 , wherein the ventilation opening comprises one or more ventilation apertures having a total aperture area between 0.2 mm 2 and 7 mm 2 .

14. The shisha device of claim 1 , wherein the transverse cross-sectional area is located in line with a central point of the ventilation opening.

15. The shisha device of claim 1 , wherein the aerosol-generating element and the centre of the ventilation opening are separated by no more than 30 mm.

16. The shisha device of claim 1 , wherein the device increases visible aerosol, total aerosol mass, or visible aerosol and total aerosol mass relative to a device that does not include the ventilation opening.