It is already a known practice to place turbulators in the fluid circulation tubes of heat exchangers in order to increase heat exchanger efficiency by forming turbulence in the flow of fluid along the tubes.
Up to now, turbulators have often been in the form of highly elongate, very thin, rectangular strips of ductile material such as aluminum having baffles punched out from the strip and projecting from both faces thereof. However, it to be observed that such turbulators are deformable and difficult to insert into the tubes, in particular when the tubes are of oblong or oval cross section. This is because the turbulator strips are so thin and because of the baffles projecting from both sides thereof.
Preferred embodiments of the present invention mitigate these drawbacks.