Abstract: The present invention relates to a product for fluidic applications, with at least one surface segment having a plurality of ribs in contact with a fluid flowing in a flow direction and adjacent ribs delimit between them in each case a valley and a method for production and a use of such a product. The product according to the invention can be produced economically with further improved flow properties; in that at least two ribs with the valley they respectively delimit are combined in a group, that at least two groups are present, and separated from each group arranged adjacent to it, viewed transverse to the flow direction S of the fluid, by a valley, and that the height profile of the valley differs in each case from the height profile of the valleys delimited by those ribs of the groups which are adjacent to the valley separating the groups.

Abstract: A nozzle device for a furnace, having a central supply pipe, on which at least one nozzle opening and a feed connection for connecting the nozzle device to a gas supply are provided, the gas supply feeding a gas into the nozzle device flowing through the nozzle device and issuing from the at least one nozzle opening, and also relates to a furnace for heat treating a steel flat product. The nozzle device and the furnace by simple means ensure that the respective heat treatment produces uniform results in an optimum way. This is achieved by the nozzle device having a first section, in which it has a smaller effective nozzle opening cross-section than in a second section which seen in the flow direction of the gas issuing from the respective feed connection and flowing through the nozzle device is arranged further away from the feed connection in question.

Abstract: The present invention relates to a product for fluidic applications, with at least one surface segment having a plurality of ribs in contact with a fluid flowing in a flow direction and adjacent ribs delimit between them in each case a valley and a method for production and a use of such a product. The product according to the invention can be produced economically with further improved flow properties; in that at least two ribs with the valley they respectively delimit are combined in a group, that at least two groups are present, and separated from each group arranged adjacent to it, viewed transverse to the flow direction S of the fluid, by a valley, and that the height profile of the valley differs in each case from the height profile of the valleys delimited by those ribs of the groups which are adjacent to the valley separating the groups.