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1	Design Optimization of Submerged Jet Nozzles for Enhanced Mixing Espinosa, Edgard 15 July 2011 (has links) The purpose of this thesis was to identify the optimal design parameters for a jet nozzle which obtains a local maximum shear stress while maximizing the average shear stress on the floor of a fluid filled system. This research examined how geometric parameters of a jet nozzle, such as the nozzle's angle, height, and orifice, influence the shear stress created on the bottom surface of a tank. Simulations were run using a Computational Fluid Dynamics (CFD) software package to determine shear stress values for a parameterized geometric domain including the jet nozzle. A response surface was created based on the shear stress values obtained from 112 simulated designs. A multi-objective optimization software utilized the response surface to generate designs with the best combination of parameters to achieve maximum shear stress and maximum average shear stress. The optimal configuration of parameters achieved larger shear stress values over a commercially available design. design optimization genetic algorithm particle swarm optimization jet nozzle
2	DESIGN AND TESTING OF LOW DIVERGENCE ELLIPTICAL-JET NOZZLES FOR USE IN CREEP-FEED GRINDING Rouly, Ovey Etienne 02 December 2013 (has links) A novel method was developed to design and fabricate nozzles capable of producing low-divergence fluid jets. Nozzle apertures were elliptical, and jets exhibited elliptical cross-sections with divergence varying predictably between 0 and 13°. Nozzle aperture aspect ratios varied from 1.00 to 2.45, area was equivalent to that of a 6mm diameter circle. An elliptical jet was developed with 0.4° and 0.9° divergence in the major and minor axes, respectively. Performance of this elliptical nozzle was compared to that of a circular nozzle via profiled creep-feed grinding trials. Results indicate the circular nozzle performs similarly to the horizontal ellipse; the vertical ellipse frequently caused wheel breakdown. Optimized cutting parameters: wheel speed 23m/s, cut depth 1.78mm, feed rate 200mm/min, jet pressure 3.21MPa or greater. Experiments were performed on a Blohm Planomat 408 CNC grinding machine using CimTech 310 cutting fluid. Nozzle experiments used a Brix concentration of 6.1%, grinding experiments used 3.1%.
3	Turbulence Mechanisms in a Supersonic Rectangular Multistream Jet with an Aft-Deck Stack, Cory M. 17 October 2019 (has links) No description available. Aerospace Engineering
4	Shattering Kraft Recovery Boiler Smelt by a Steam Jet Taranenko, Anton 19 March 2013 (has links) Kraft recovery boiler smelt is shattered into small droplets by an impinging steam jet to prevent smelt-water explosions in the dissolving tank. Inadequate shattering increases the likelihood of dissolving tank explosions. While industry has not dedicated much effort to smelt shattering, the safety implications require smelt shattering to be studied in detail. An experimental set-up was constructed to simulate the shattering operation using a water-glycerine solution and air instead of smelt and steam respectively. The objective was to examine how physical properties and flow characteristics affect shattering. It was found that increasing shatter jet velocity greatly reduced droplet mean diameter. Increasing the liquid flow rate greatly increased droplet size, as expected. Shattering was not significantly affected by viscosity, unless a weak shatter jet was used on a highly viscous fluid. Increasing the proximity of the shatter jet nozzle decreased droplet size. pulp and paper kraft recovery cycle recovery boiler smelt shattering steam jet atomization droplet size smelt-water explosion dissolving tank explosions water-glycerine solution air jet shatter jet velocity effect liquid flow rate effect viscosity effect shatter jet nozzle proximity effect 0542
5	Shattering Kraft Recovery Boiler Smelt by a Steam Jet Taranenko, Anton 19 March 2013 (has links) Kraft recovery boiler smelt is shattered into small droplets by an impinging steam jet to prevent smelt-water explosions in the dissolving tank. Inadequate shattering increases the likelihood of dissolving tank explosions. While industry has not dedicated much effort to smelt shattering, the safety implications require smelt shattering to be studied in detail. An experimental set-up was constructed to simulate the shattering operation using a water-glycerine solution and air instead of smelt and steam respectively. The objective was to examine how physical properties and flow characteristics affect shattering. It was found that increasing shatter jet velocity greatly reduced droplet mean diameter. Increasing the liquid flow rate greatly increased droplet size, as expected. Shattering was not significantly affected by viscosity, unless a weak shatter jet was used on a highly viscous fluid. Increasing the proximity of the shatter jet nozzle decreased droplet size. pulp and paper kraft recovery cycle recovery boiler smelt shattering steam jet atomization droplet size smelt-water explosion dissolving tank explosions water-glycerine solution air jet shatter jet velocity effect liquid flow rate effect viscosity effect shatter jet nozzle proximity effect 0542

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