Beverage preparation apparatus comprising a mixing chamber

A method for producing a beverage in a beverage preparation apparatus, the method comprising:

• providing the beverage preparation apparatus, the beverage preparation apparatus comprising at least one chamber for receiving and mixing an aqueous liquid and at least one soluble beverage ingredient, the at least one chamber comprising:
• a lateral side wall, a lower part of the wall being essentially cylindrical, and the lateral side wall comprising a liquid inlet,
• a bottom wall comprising a beverage outlet,
• the liquid inlet is positioned close to a bottom of the at least one chamber,
• the liquid inlet is configured so that the aqueous liquid is introduced in the at least one chamber as a straight jet of liquid, the straight jet of liquid extending transversely through an internal volume of the at least one chamber along a line L, the line L being offset relative to a longitudinal central axis of the at least one chamber,
• at an area of the lateral side wall opposed to the liquid inlet and crossed by the line L, the at least one chamber comprises a bump extending from the lateral side wall inside the at least one chamber, the bump having a shape designed:
• to convert the straight jet of liquid extending transversely through the internal volume of the at least one chamber into a swirl flowing along the lateral side wall off the at least one chamber, and
• to reduce a diameter of the swirl rotating back to the bump and to guide the swirl in a direction of the liquid inlet,
• the bump comprises a first side and a second side, the first side and the second side are lateral and at least partially curved, each extending gradually from a cylinder defined by the lateral side wall inside the inner volume of the at least one chamber and converging at a central common essentially vertical edge,
• the first side is crossed by the line L and comprises:
• a curved trailing part end tangent to the lateral side wall, and
• a leading part end oriented so that an angle between the leading part end and the line L is of at most 45°,
• the second side comprises:
• a curved leading part end tangent to the lateral side wall, and
• a trailing part end oriented so that an angle between the trailing part end and the line L is of at most 90°, and
• a trailing edge positioned at a distance d2 from a centre O of the lateral side wall of the at least one chamber inferior to a radius r0 of the lateral side wall of the at least one chamber;
• dosing the at least one chamber with the at least one soluble beverage ingredient, and
• introducing the aqueous liquid through the liquid inlet.