Abstract:
A method of fabricating an elastomeric structure, comprising: forming a first elastomeric layer on top of a first micromachined mold, the first micromachined mold having a first raised protrusion which forms a first recess extending along a bottom surface of the first elastomeric layer; forming a second elastomeric layer on top of a second micromachined mold, the second micromachined mold having a second raised protrusion which forms a second recess extending along a bottom surface of the second elastomeric layer; bonding the bottom surface of the second elastomeric layer onto a top surface of the first elastomeric layer such that a control channel forms in the second recess between the first and second elastomeric layers; and positioning the first elastomeric layer on top of a planar substrate such that a flow channel forms in the first recess between the first elastomeric layer and the planar substrate.
Abstract:
A method of fabricating an elastomeric structure, comprising: forming a first elastomeric layer on top of a first micromachined mold, the first micromachined mold having a first raised protrusion which forms a first recess extending along a bottom surface of the first elastomeric layer; forming a second elastomeric layer on top of a second micromachined mold, the second micromachined mold having a second raised protrusion which forms a second recess extending along a bottom surface of the second elastomeric layer; bonding the bottom surface of the second elastomeric layer onto a top surface of the first elastomeric layer such that a control channel forms in the second recess between the first and second elastomeric layers; and positioning the first elastomeric layer on top of a planar substrate such that a flow channel forms in the first recess between the first elastomeric layer and the planar substrate.
Abstract:
A method of fabricating an elastomeric structure, comprising: forming a first elastomeric layer on top of a first micromachined mold, the first micromachined mold having a first raised protrusion which forms a first recess extending along a bottom surface of the first elastomeric layer; forming a second elastomeric layer on top of a second micromachined mold, the second micromachined mold having a second raised protrusion which forms a second recess extending along a bottom surface of the second elastomeric layer; bonding the bottom surface of the second elastomeric layer onto a top surface of the first elastomeric layer such that a control channel forms in the second recess between the first and second elastomeric layers; and positioning the first elastomeric layer on top of a planar substrate such that a flow channel forms in the first recess between the first elastomeric layer and the planar substrate.
Abstract:
A method of fabricating an elastomeric structure, comprising: forming a first elastomeric layer on top of a first micromachined mold, the first micromachined mold having a first raised protrusion which forms a first recess extending along a bottom surface of the first elastomeric layer; forming a second elastomeric layer on top of a second micromachined mold, the second micromachined mold having a second raised protrusion which forms a second recess extending along a bottom surface of the second elastomeric layer; bonding the bottom surface of the second elastomeric layer onto a top surface of the first elastomeric layer such that a control channel forms in the second recess between the first and second elastomeric layers; and positioning the first elastomeric layer on top of a planar substrate such that a flow channel forms in the first recess between the first elastomeric layer and the planar substrate.
Abstract:
A fluidic flow control device includes at least three terminals with two of the terminals being connected to input nozzles opposing each other in axial alignment. An interspace is provided adjacent the point of intersection of the two streams from the nozzles and a radial diffuser is provided encircling the interspace. The third terminal communicates with the radial diffuser. The variable relationship between the flows produced at the nozzles is effective to control the flow at the third terminal. The diffuser is formed by planar faces separated by a constant width gap. The gap opens into an annular plenum to which the third terminal is connected. The entry area to the radial diffuser is sized to be substantially equal to the sum of the areas of the nozzle throats. In one embodiment, a mixer region may be provided between the diffuser and at least one of the nozzles. A fourth terminal acting as a vent may communicate with the mixer region. If desired, a second radial diffuser may be provided and one nozzle throat may be larger than the other. A partition may be provided in the diffuser.
Abstract:
Flow of gas through a conduit of a gas-handling system, particularly the exhaust system of a material processing furnace operating at high temperatures, is controlled by directing a control gas (usually air) into the conduit in opposition to the normal flow of gas therethrough at a location such that it can comprehend substantially the entire cross-sectional area of the conduit substantially without diminution of such area or interference with fluid flow at such location when full normal flow is desired. The apparatus includes a duct leading from a pressure source of control gas to nozzle means disposed substantially entirely outside the conduit but with the discharge therefrom directed into the conduit from at least one side thereof and in opposition to normal gas flow through the conduit.
Abstract:
A pneumatic rectangular wave generator including a differential pressure amplifier, one input pressure of which is derived from a pressure divider and the other input pressure is derived from the output pressure delayed by a timing element.
Abstract:
This disclosure includes a fluidic accelerometer in the form of a split looped planar conduit terminating in a pair of opposed nozzles and having a center supply connection to establish flow in opposite directions. A summing impact modulator or other fluidic amplifier is connected to the conduit nozzles to provide an amplified fluidic output signal. Angular acceleration of the conduit about an axis perpendicular to the plane of the conduit results in a pressure gradient along the conduit resulting in a differential pressure at the ends or nozzles which is impressed on the modulator with a corresponding output signal established.
Abstract:
A DIFFERENTIAL FLUID LOGIC CELL HAVING AN ELONGATED ENCLOSURE, EACH END OF WHICH IS PROVIDED WITH AN IDENTICAL AXIAL NOZZLE AND A LATERAL FLUID EXIT FLUID BROUGHT INTO THE ENCLOSURE THROUGH THE TWO NOZZLES UNDER SUBSTANTIALLY EQUAL PRESSURES LEAVES THE ENCLOSURE IN SUCH A WAY THAT THE DIFFERENCE IN FLUID FLOW ESCAPING THROUGH THE FLUID EXISTS CHANGES ITS SIGN IN RESPONSE TO A CHANGE IN SIGN OF THE DIFFERENCE IN PRESSURES PREVAILING IN THE ENDS OF THE ENCLOSURE.