Nozzle

About: Nozzle is a research topic. Over the lifetime, 158675 publications have been published within this topic receiving 893026 citations. The topic is also known as: spout.

Fluid dispensing nozzle including in line flow meter and data processing unit

Abstract: An improved apparatus for dispensing fuel and the like is disclosed including a display unit and a data processing system. Flow of fuel is montitored and the information relating to amount, price, etc., may be displayed on a display unit mounted directly on the nozzle. The moving mechanical parts such as the valve are readily separable from the outer handle of the nozzle so that if a customer inadvertently drives a vehicle away with the nozzle still inserted in the gasoline tank, the costly mechanical components of the valve are retained at the gasoline service station.

Acoustic Simulation of Coaxial Hot Air Jets Using Cold Helium-Air Mixture Jets

Abstract: This work examines the ability of small-scale helium-air mixture coaxial jets to simulate the acoustics of large-scale hot air jets representing the exhaust of separate-flow turbofan engines. Experiments employed a one-eighth-scale model of a separate-flow nozzle used in hot tests at NASA John H. Glenn Research Center. Comparisons were conducted for two set points using the following methods: matching velocity and density, and matching velocity and Mach number. For both methods, the helium-air data compare well with the hot data in all measures of noise: spectral shapes, spectral levels, and overall sound pressure levels. The method of matching velocity and Mach number gives slightly better agreement in the spectral shapes at angles close to the jet axis and in the overall sound pressure levels. The overall agreement between the hot air and helium-air mixture data is within 1.2 dB.

Spray nozzle, devices containing the same and apparatus for making such devices

Abstract: A spray nozzle comprises, in a housing, a hollow nozzle interior comprising a discharge chamber containing a nozzle outlet and, as a first stage of turbulence, an annular chamber coaxially about the central axis of the nozzle outlet, and feed channels which lead from the annular chamber at least approximately tangentially to the periphery of the discharge chamber, and supply duct means for feeding liquid to the first stage of turbulence comprising feed channels feeding liquid tangentially The hollow nozzle interior further comprises at least one additional stage of turbulence, and between two successive stages of turbulence, at least one obstacle breaking up the liquid flowing from the upstream to the downstream stage of turbulence and deflecting the liquid out of the flow plane through the annular chamber towards the side of the nozzle outlet by an angle of maximally 90°

A thermal inkjet printhead with a monolithically fabricated nozzle plate and self-aligned ink feed hole

Abstract: A monolithic thermal inkjet printhead has been developed and demonstrated to operate successfully by combining monolithic growing of a nozzle plate on the silicon substrate and electrochemical etching of silicon for an ink feed hole. For the monolithic fabrication, a multiexposure and single development (MESD) technique and Ni electroplating are used to form cavities, orifices, and the nozzle plate. Electrochemical etching, as a back-end process, is applied to form an ink feed hole through the substrate, which is accurately aligned with the frontside pattern without any backside mask. The etch rate is nearly proportional to the current density up to 50 /spl mu/m/min. Experiments with a 50-/spl mu/m-diameter nozzle show ink ejection up to the operating frequency of 11 kHz with an average ink dot diameter of about 110 /spl mu/m for 0.3-A, 5-/spl mu/s current pulses.

Progress toward gas atomization processing with increased uniformity and control

Abstract: Many advanced technologies based on particulate materials demand the availability of fine spherical powders or spherical powders of a narrow particle size class. Generally, high-pressure gas atomization (HPGA) is a close-coupled discrete jet atomization method and is one of the most effective methods of producing such powders. Development of HPGA nozzles with discrete jets resembling convergent–divergent (C–D) rocket nozzle designs, instead of the previous cylindrical jets, was conducted to increase atomization efficiency and uniformity and to reduce the required gas supply pressures. Results of compressible gas flow measurements on both types of HPGA nozzles revealed a steadily increasing trend of gas mass flow with gas supply pressure and a positive deviation from isentropic behavior that increases for increasing supply pressure. This has been attributed to an insufficient volume in the atomization nozzle gas manifold that experiences enhanced expansion cooling at increasing pressures. In experiments on 316L stainless steel, the atomization efficiency of the HPGA nozzle with C–D jets was higher than that of the HPGA nozzle with cylindrical jets, reflecting a lower gas/metal mass flow ratio. In other words, while the powder size distributions were nearly the same for all of the HPGA experiments, the HPGA nozzle with C–D jets utilized atomization gas with a significantly reduced operating pressure and mass flow rate.