A cooling device for cooling electronic components in thermal contact with an outer side of a thermally conducting first coolant chamber wall;
- wherein the cooling device comprises an inner volume between an inner side of the first coolant chamber wall and an opposite second coolant chamber wall with flow paths for a coolant through the inner volume for cooling the first coolant chamber wall;
- wherein a separation wall divides the inner volume into a first volume between the separation wall and the first coolant chamber wall and a second volume between the separation wall and the second coolant chamber wall, wherein the separation wall comprises a pattern of openings through the separation wall connecting the first volume with the second volume;
- wherein a first flow structure is provided only in the first volume and sealingly connected to the first side of the separation wall and to the first coolant chamber wall, and a second flow structure is provided only in in the second volume and sealingly connected to the second side of the separation wall and to the second coolant chamber wall, so as to sandwich the separation wall by the first and second flow structures;
- wherein the flow path comprises an averaged first flow path in a first, forward direction along the first coolant chamber wall from a first end to a second, opposite end of the flow structures;
- wherein the flow path comprises an averaged second flow path in a second, opposite direction along the first coolant chamber wall from the second end to the first end for uniform cooling of the first coolant chamber wall by the combination of the flow of coolant along the mutually opposite first and the second flow paths;
- wherein the first flow structure comprises an array of multiple side-by-side placed first undulating walls, each of which has an alternating wave-form with first concave portions, wherein the array of first undulating walls in combination with the first coolant chamber wall and the separation wall define a first array of multiple undulating first channels with a corresponding alternating wave-form in the first volume, and wherein the second flow path structure comprises an array of multiple side-by-side placed second undulating walls, each of which has an alternating wave-form with second concave portions, wherein the array of second undulating walls in combination with the second coolant chamber wall and the separation wall define a second array of multiple undulating second channels with a corresponding alternating wave-form on the separation wall in the second volume, wherein each the first and second undulating walls have an averaged wave-form direction that is perpendicular to the first and second flow paths, and wherein the first flow structure is geometrically inverted relatively to the second flow structure so that first and second walls cross in a geometrical projection through the separation wall;
- wherein the separation wall comprises an opening of the pattern of openings provided at each of the concave portions, each opening being adjacent to both one of the first concave portions and one of the second concave portions, where the second concave portion is inverted relatively to the one first concave portion, for flow of coolant between one of the first channels and one of the second channels through the respective opening;
- wherein the flow structures are arranged for flow of coolant from the first end to the second end and flow of coolant from the second end to the first end in multiple subsequent coolant flow periods, each of such periods including flow from the second volume through a first opening into a first one of the first channels in the first volume, flow along this channel towards the second end and to a second opening in this channel, then through the second opening into one of the second channels in the second volume and further forward towards the second end in this channel to a third opening for flow through the third opening back into the first volume, repeating this coolant flow period through a first portion of first and second channels until reaching the second end, and arranged for coolant flow along the second flow path in similar coolant flow periods directed towards the first end;
- wherein the second flow path is through a second portion of the first and second channels which is different from a first portion of the first and second channels.