Abstract: Described is a new multilevel article comprising a multitude of ducts and, in each duct in the direction of flow, at least one area which generates turbulence, forms an open duct section, is connected to the duct wall, and forms a baffle for the incoming flow and a stall strip for the outgoing flow. The described article has a plurality of successive interconnected duct structures which form a step-like transition in relation to each other in the direct of flow.

Abstract: Described is a new multilevel article comprising a multitude of ducts and, in each duct in the direction of flow, at least one area which generates turbulence, forms an open duct section, is connected to the duct wall, and forms a baffle for the incoming flow and a stall strip for the outgoing flow. The described article has a plurality of successive interconnected duct structures which form a step-like transition in relation to each other in the direct of flow.

Abstract: The invention relates to a device through which a fluid can flow and that has a cellular structure, a system for modular optimization of cellular structures, and also a method for producing such structures. The device through which a fluid can flow comprises a working range with a cellular structure. The cellular structure has a shape and/or dimensions such that, with respect to a monolithic device with at least two channels that have a rectangular cross section, the thermal conductivity is greater and/or the flow resistance is lower and/or the mechanical resistance, in particular, the compressive and/or tensile resistance, is higher and/or the temperature stability is higher.