Abstract: A channel system is disclosed for optimizing the relation between pressure drop and heat, moisture and/or mass transfer of fluids flowing through the system. In at least one embodiment, the channel system includes at least one channel having at least one channel wall and at least one flow director having a height, the flow director extending in a fluid flow direction and transversely to the channel. It further includes an upstream portion, a downstream portion and an intermediate portion between the upstream and downstream portions, the upstream portion deviating, in the fluid flow direction, from the channel wall inwardly into the channel, and the downstream portion returning, in the fluid flow direction, towards the channel wall, wherein a transition between the intermediate portion and the downstream portion is curved with a radius.

Abstract: Present invention relates to a channel system for improving the relation between pressure drop and heat, moisture and/or mass transfer of fluids flowing through said system, said channel system comprising at least one channel comprising at least a first and a second flow director, said channel having a cross-section area A and a first and a second cross-section area A1, A2 at respective flow director, said flow directors extending in a fluid flow direction and transversely to said channel, and comprising an upstream portion, deviating, in said fluid flow direction, from a channel wall of said channel inwardly into said channel, a downstream portion returning, in said fluid flow direction, towards said channel wall, and an intermediate portion located between said upstream and downstream portions, wherein said first cross-section area A1 at said first flow director is smaller than said second cross-section area A2 at said second flow director.

Abstract: Present invention relates to a channel system for improving the relation between pressure drop and heat, moisture and/or mass transfer of fluids flowing through said system, said channel system comprising at least one channel comprising at least a first and a second flow director, said channel having a cross-section area A and a first and a second cross-section area A1, A2 at respective flow director, said flow directors extending in a fluid flow direction and transversely to said channel, and comprising an upstream portion, deviating, in said fluid flow direction, from a channel wall of said channel inwardly into said channel, a downstream portion returning, in said fluid flow direction, towards said channel wall, and an intermediate portion located between said upstream and downstream portions, wherein said first cross-section area A1 at said first flow director is smaller than said second cross-section area A2 at said second flow director.

Abstract: A channel system is disclosed for optimising the relation between pressure drop and heat, moisture and/or mass transfer of fluids flowing through the system. In at least one embodiment, the channel system includes at least one channel having at least one channel wall and at least one flow director having a height, the flow director extending in a fluid flow direction and transversely to the channel. It further includes an upstream portion, a downstream portion and an intermediate portion between the upstream and downstream portions, the upstream portion deviating, in the fluid flow direction, from the channel wall inwardly into the channel, and the downstream portion returning, in the fluid flow direction, towards the channel wall, wherein a transition between the intermediate portion and the downstream portion is curved with a radius.

Abstract: Catalytic converter for treatment of exhaust gas from combustion engines, comprising a metal monolith (13) held together by interlocking ridges (15) between spirally wound layers without brazes or welds, with a mantle (14) held to the monolith by the same type of interlocking ridges (16), and where the mantle has an integral clamping flange (17) which is clamped between the exhaust manifold (12) and an exhaust port (11) of the engine block (10).

Abstract: A method for corrugating a metal foil (11), which together with a longitudinally flat foil (12) is intended to form a foil package pervious to liquid or gas, where the folds are made with a very small fold radius by rolling in at least two steps between rollers (42, 43) disposed in pairs, the fold radius (51) being large and the fold height (52) low in a first step, and after the final step, the fold radius (53) is less than 10%, preferably 2 to 5% of the fold distance (55), and the fold height (54) is greater than after the first step.

Abstract: A catalyst carrier for exhaust systems in internal combustion engines, the catalyst carrier being made of wound metal foils and equipped with a mantle consisting of at least two portions (12, 13) having bent-out edges (16, 17), the portions being clamped around the catalyst carrier with the bent-out edges in mutual contact and joined to form longitudinal flanges (18) for instance by means of welding, upon which the flanges are usable to prevent rotation or displacement of the catalyst carrier when this is mounted in a canning included in an exhaust system.

Abstract: A method for corrugating a metal foil (11), which together with a longitudinally flat foil (12) is intended to form a foil package pervious to liquid or gas, where the folds are made with a very small fold radius by rolling in at least two steps between rollers (42, 43) disposed in pairs, the fold radius (51) being large and the fold height (52) low in a first step, and after the final step, the fold radius (53) is less than 10%, preferably 2 to 5% of the fold distance (55), and the fold height (54) is greater than after the first step.

Abstract: A catalytic converter includes a channel for conducting a gas flow forwardly in a longitudinal direction. The channel is coated with a catalyst and has at least first and second turbulence generators spaced apart in the longitudinal direction for making the gas flow turbulent. Each turbulence generator includes a rear face inclined forwardly at an angle of from 35 to 60° from a base of the channel and facing rearwardly, a connecting face extending forwardly from a free edge of the rear face and a front face projecting toward the base from a front edge of the connecting face and facing forwardly. The first turbulence generator is disposed closer to an inlet of the channel than the second turbulence generator. A longitudinal center of the first turbulence generator is spaced longitudinally from the channel inlet by a distance, which is a function of the hydraulic diameter of the channel, the Reynold's number, and the Schmidt's number 1 of the gas.