Fin for a heat exchanger

Abstract

A fin for a heat exchanger is provided that includes a fin element which extends in a 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 straight edge of the flap extends substantially perpendicularly to the flow direction and is arranged at a distance from the wall face in order to form the cutout, wherein the flap has an inclined, smooth tab face which terminates at the first straight edge, and wherein the tab face is connected to the wall face via two side walls of the tab, which side walls have a curved profile mirror-symmetrically with respect to each other and, starting from the first edge, have a height which decreases in a manner corresponding to the inclination of the tab face.

1 . A fin for a heat exchanger comprising:
 a fin element configured to extend in a flow direction of a first fluid and has a wall face around which the first fluid flows on both sides; and   at least one flap provided in the wall face, the flap forming an aperture through which the first fluid can flow into the wall face, a first straight edge of the flap being configured to extend substantially perpendicular to the flow direction and being arranged at a distance from the wall face to form the aperture,   wherein the flap has an inclined, smooth tab face that terminates at the first straight edge, and   wherein the tab face is connected to the wall face via two side walls of the tab, which side walls have a curved profile mirror-symmetrically with respect to one another and, starting from the first edge, have a height which decreases in a manner corresponding to the inclination of the tab face.   
   
   
       2 . The fin according to  claim 1 , wherein the first edge, end-side edges of the side walls, and a second straight edge of the wall face form a rectangle that is oriented substantially perpendicularly to the flow direction and through which the first fluid is flowable. 
   
   
       3 . The fin according to  claim 2 , wherein a long side of the rectangle corresponds to the first edge and has a length that is approximately five times the length of a short side of the rectangle. 
   
   
       4 . The fin according to  claim 2 , wherein the length of the tab face in the flow direction is approximately eight times the length of short sides of the rectangle. 
   
   
       5 . The fin according to  claim 1 , wherein flap is mirror-symmetrical with respect to a central axis of symmetry. 
   
   
       6 . The fin according to  claim 1 , wherein a width of the tab face reduces with increasing distance from the first edge. 
   
   
       7 . The fin according to  claim 6 , wherein an end of the tab face opposite the first edge has a smallest width, and wherein the smallest width is no more than one tenth, in particular about one twelfth of the length of the first edge. 
   
   
       8 . The fin according to  claim 1 , wherein a curve of one of the side walls has at least one point of inflection in its course with regard to a direction of curvature. 
   
   
       9 . The fin according to  claim 1 , wherein an inclination of the tab face with respect to the wall face is approximately seven degrees. 
   
   
       10 . The fin according to  claim 1 , wherein a shape of the tab face starting from the first edge has approximately the parameterisation [0; 2.500], [0.805; 2.470], [1.610; 2.290], [2.420; 1. 910], [3.220; 1.540], [4.030; 1.210], [4.840; 0.980], [5.640; 0.780], [6.440; 0.590], [7.240; 0. 400], [8.050; 0.210], wherein the first value in each case specifies the distance from the first edge and the second value in each case specifies the distance from a central axis of symmetry to a side wall. 
   
   
       11 . The fin according to  claim 1 , wherein the fin has a plurality of flaps arranged one after the other in the direction of flow. 
   
   
       12 . The fin according to  claim 1 , wherein at least two flaps with different opening directions are provided in the wall face.