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 fin for a heat exchanger, comprising a fin element which extends in the flow direction of a first fluid and has a wall face around which the first fluid flows on both sides, wherein at least one flap is provided in the wall face, which flap forms a cutout, through which the first fluid can flow, in the wall face, wherein a first edge of the flap for forming the cutout is arranged spaced apart from the wall face, wherein the flap has a tab face which is inclined with respect to the wall face and terminates at the first edge, wherein the tab face is connected to the wall face via at least one side wall, extending with a curved profile, of the flap, which side wall, starting at the first edge, has a height which decreases in a way which corresponds to the inclination of the tab face.

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).

Abstract: The invention relates to a fin for a heat exchanger, comprising a fin element which extends in the flow direction of a first fluid and has a wall face around which the first fluid flows on both sides, wherein at least one flap is provided in the wall face, which flap forms a cutout, through which the first fluid can flow, in the wall face, wherein a first edge of the flap for forming the cutout is arranged spaced apart from the wall face, wherein the flap has a tab face which is inclined with respect to the wall face and terminates at the first edge, wherein the tab face is connected to the wall face via at least one side wall, extending with a curved profile, of the flap, which side wall, starting at the first edge, has a height which decreases in a way which corresponds to the inclination of the tab face.

Abstract: The invention is based on a multi-chamber flat tube (V1-V17) having at least two chambers (1, 2) for holding the flow of a fluid, produced by deforming a sheet-metal strip, in particular produced in a bending and/or folding and/or crimping process, in which a closed profile is formed by: opposite wide walls (4, 6) which are connected to one another by means of opposite narrow walls (5, 7) which form in each case one deformed region, with the wide and narrow walls forming outer sides of the profile, with a first wide wall (4) being formed by an inner section of the sheet-metal strip which is situated between side sections of the sheet-metal strip, and with a second wide wall (6) being formed by side sections, which are arranged to the sides of the inner section, of the sheet-metal strip, with the first and second wide walls (4, 6) being connected by means of a web (3) which separates at least two chambers and which forms an inner side of the profile and which is formed by an edge section (3A, 3B) of at least o