# US 2014/0191059 A1 · Nozzle capable of deviating a synthetic jet in a dynamic and controllable manner with no moving mechanical parts and a control system thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0191059 A1 - Document ID: US20140191059A1 - Status: Published application - Kind: A1 - Application number: 14/129,712 - Filed: 2012-06-25 - Published: 2014-07-10 - Earliest claimed: 2011-07-01 - Assignees: Universita' Degli Studi Di Modena E Reggio Emilia - Inventors: Federica Baffigi; Antonio Dumas; Ilaria Giuliani; Mauro Madonia; Michele Trancossi - Web page: https://patentgrep.com/patent/US20140191059A1 ## CPC - B05B 1/005: {Nozzles or other outlets specially adapted for discharging one or more gases} - B05B 1/08: of pulsating nature, e.g. delivering liquid in successive separate quantities - B05B 7/0815: {with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter} - B05B 12/18: using fluids, e.g. gas streams - F15D 1/08: of jets leaving an orifice - F23D 14/48: Nozzles - F23D 14/84: Flame spreading or otherwise shaping (F23D14/70 takes precedence) - B05B 7/0408: {with arrangements for mixing two or more liquids} - F23D 2900/14482: Burner nozzles incorporating a fluidic oscillator - B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D) - F15D: FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS - F23D: BURNERS ## Abstract A nozzle is capable of producing a mixing of two primitive fluid jets and a selective and controllable angular deviation of the synthetic jet obtained by mixing the primitive jets without any moving mechanical part. The nozzle is also capable of generating a controllable deviation of the synthetic jet and of changing the direction of this jet in a continuous and dynamic manner so as to allow the jet to sweep a preset and arbitrary angle. The nozzle is constituted, in a first part thereof, by a conduit divided into two channels by a central baffle and, in a second part thereof, by a convergence zone and an outflow mouth whose walls have a curvilinear profile and are connected seamlessly to the walls of the conduit. ## Claims ### Claim 1 A nozzle comprising: a conduit divided into a first channel in which a first jet of a fluid can flow and into a second channel in which a second jet of a fluid can flow; a convergence zone for converging the first jet and the second jet one towards another, so as to obtain a synthetic jet; an exit zone through which the synthetic jet can exit the nozzle; wherein the exit zone is delimited by a first Coanda surface and by a second Coanda surface, the first Coanda surface being arranged in a position adjacent the first channel and the second Coanda surface being arranged in a position adjacent the second channel, so that the first jet adheres to the first Coanda surface and drags the second jet or, alternatively, the second jet adheres to the second Coanda surface and drags the first jet. ### Claim 2 (depends on 1) A nozzle according to claim 1, wherein, in the convergence zone, the conduit has a cross-section which narrows towards the exit zone. ### Claim 3 (depends on 1) A nozzle according to claim 1, and further comprising an outflow mouth in which the first Coanda surface and the second Coanda surface are arranged at a minimum distance one from another. ### Claim 4 (depends on 3) A nozzle according to claim 3, and further comprising a stabilization zone defined in the first channel and in the second channel for stabilizing the first jet and the second jet from a fluid-dynamic point of view, the stabilization zone being arranged upstream of the convergence zone, the convergence zone ending at the outflow mouth. ### Claim 5 (depends on 1) A nozzle according to claim 1, and further comprising a separation baffle for separating the first channel from the second channel. ### Claim 6 (depends on 5) A nozzle according to claim 5, wherein the separation baffle is solid, i.e. non-hollow. ### Claim 7 (depends on 5) A nozzle according to claim 5, wherein the first Coanda surface is provided as a continuation of a wall of the conduit which delimits the first channel opposite the separation baffle, the second Coanda surface being provided as a continuation of a further wall of the conduit which delimits the second channel opposite the separation baffle. ### Claim 8 (depends on 5) A nozzle according to claim 5, and further comprising an outflow mouth in which the first Coanda surface and the second Coanda surface are arranged at a minimum distance one from another, wherein the separation baffle does not protrude beyond the outflow mouth. ### Claim 9 (depends on 5) A nozzle according to claim 5, and further comprising an outflow mouth in which the first Coanda surface and the second Coanda surface are arranged at a minimum distance one from another, wherein the separation baffle has an end arranged at a preset distance from the outflow mouth, said preset distance being greater than, or equal to, half the minimum distance between the first Coanda surface and the second Coanda surface. ### Claim 10 (depends on 5) A nozzle according to claim 5, wherein the first channel and the second channel have, at a side of the separation baffle opposite the exit zone, respective initial thicknesses, the sum of said initial thicknesses being greater than, or equal to, the minimum distance between the first Coanda surface and the second Coanda surface. ### Claim 11 (depends on 1) A nozzle according to claim 1, wherein the first channel and the second channel define respective passage sections for the first jet and the second jet, said respective passage sections narrowing towards the exit zone. ### Claim 12 (depends on 1) A nozzle according to claim 1, wherein the first Coanda surface and the second Coanda surface are convex surfaces having arbitrary curvature radii. ### Claim 13 (depends on 1) A nozzle according to claim 1, wherein the first Coanda surface and/or the second Coanda surface arranged in the exit zone have an abrupt interruption along their extension, so that the synthetic jet which adheres to the first Coanda surface or to the second Coanda surface proceeds beyond the first Coanda surface or the second Coanda surface along a direction defined by the tangent to the first Coanda surface or the second Coanda surface at said interruption. ### Claim 14 A method comprising: sending a first jet of a fluid through a first channel of a conduit of a nozzle; sending a second jet of a fluid through a second channel of the nozzle; mixing the first jet and the second jet to obtain a synthetic jet; causing the synthetic jet to pass through an exit zone of the nozzle, the exit zone being delimited by a first Coanda surface and by a second Coanda surface, the first Coanda surface being arranged in a position adjacent the first channel and the second Coanda surface being arranged in a position adjacent the second channel; wherein: if the first jet has a momentum greater than the second jet, the first jet adheres to the first Coanda surface and drags the second jet; if the second jet has a momentum greater than the first jet, the second jet adheres to the second Coanda surface and drags the first jet. ### Claim 15 (depends on 14) A method according to claim 14, and further comprising the step of modifying the momentum of the first jet and/or of the second jet in order to vary direction of the synthetic jet.