The present invention provides a device 1 for producing milk foam which makes use of Couette flow and a high shear stress that is accordingly applied to a milk air mixture between two concentrically arranged cylinders 2 3. The cylinders are rotated relatively to another. The high shear stress leads to an emulsion of the milk and the air which is the basis for a foaming effect once the emulsion flows out of a gap 6 between the two cylinders 2 3 and expands. The parameters of the device 1 that mainly influence the foaming effect are the width of the gap 6 and the relative rotation speed of the cylinders.
