Abstract: A flat tube with a wall made of a shaped first sheet metal strip which forms two fluid chambers, wherein the two fluid chambers are arranged spaced apart from one another and wherein the two fluid chambers are connected spaced apart from one another by a web wherein the flat tube has two tube ends in its tube longitudinal direction, wherein the web has a recess by means of a cutout at at least one tube end.

Abstract: A process for producing a turbulence device (1) which is to be mounted in at least one flow duct of a heat exchanger of a motor vehicle includes the steps of, in a first process step, at least one shaping operation is used to produce at least one substantially meandering turbulence device (30) with substantially smooth walls (2) from a substantially continuously planar sheared strip (9), wherein a longitudinal direction (RLR) of the walls runs substantially parallel to a forward feed direction (VSR) of the sheared strip (9), and in a second process step, wall sections are deformed at least by an angle (?) in relation to the forward feed direction (VSR), in such a way that undercuts (3) are produced in relation to the forward feed direction (VSR, RLR), wherein the substantially continuously planar sheared strip (9) is cut into turbulence devices (1) of predetermined lengths before carrying out the second process step.

Abstract: The invention relates to a process for producing a turbulence apparatus and to an apparatus for producing the turbulence apparatus which is to be held in at least one flow duct of a heat exchanger of a motor vehicle, comprising the following process steps: in a first process step, at least one shaping operation is used to produce at least one substantially meandering turbulence apparatus (30) with substantially smooth walls (2) from a substantially continuously planar sheet-metal strip (9), wherein a longitudinal direction (LR) of the walls (2) runs substantially parallel to a forward feed direction (VR) of the sheet-metal strip (9).