Original Assignee DlhBowles Inc Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) ( en Inventor Andrew Cameron Evan HARTRANFT Shridhar Gopalan Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Withdrawn Application number EP15858292.4A Other languages German ( de) Info Publication number EP3218116A1 EP3218116A1 EP15858292.4A EP15858292A EP3218116A1 EP 3218116 A1 EP3218116 A1 EP 3218116A1 EP 15858292 A EP15858292 A EP 15858292A EP 3218116 A1 EP3218116 A1 EP 3218116A1 Authority EP European Patent Office Prior art keywords lip spray segment exit orifice nozzle Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents Spray nozzle for high viscosity (e.g., oil) spray applications with uniform spray distribution Google Patents EP3218116A1 - Spray nozzle for high viscosity (e.g., oil) spray applications with uniform spray distribution According to our experience, the actual upper limit of solids concentration is about 40%.EP3218116A1 - Spray nozzle for high viscosity (e.g., oil) spray applications with uniform spray distribution Therefore, there are no clear guidelines to enable us to establish the relationship between atomization and solids concentration. Even if the particle size is appropriate, other factors, such as the viscosity of the carrier and the ability of the solid component to remain suspended, also play a role in the final atomizability. The concentration of solids in the mixture is an important factor in its nebulization. If this is not the case, the droplets formed by atomization will most likely not contain solid components, the solid components will be separated from the carrier, aggregated on the atomized surface and eventually dropped in the form of agglomerates. For droplets containing one or more solid particles, the size must be significantly larger than the size of the solid particles embedded therein. In general, if the particle size ranges beyond one tenth of the median diameter drop, the mixture will not atomize properly. Solid mixture, there are three main factors affecting atomization: particle size, solid concentration and dynamic relationship between solid and carrier. This molecule can inhibit the formation of discrete droplets because the polymerized molecules may polymerize two to three droplets.ģ. But when the solution contains very long chain polymer molecules, the results may be different. Aqueous solution, in most cases, the limiting factor is also the viscosity. As the viscosity decreases, the maximum flow rate increases accordingly.Ģ. Generally, the upper limit of viscosity is about 100 cps. Pure liquid, the only factor limiting the ability of ultrasonic atomization is viscosity. Although the ultrasonic power and frequency are adjustable, for liquids with high viscosity and high solid content, no matter how the power and frequency are adjusted, the desired effect cannot be achieved.ġ. The principle that applies to most materials is that the higher the viscosity or solids content of the liquid, the lower the maximum flow rate at which a given nozzle can be atomized. Solid mixture (coal slurry, polymer beads/water, silica/ethanol, etc.) Pure one-component liquid (water, alcohol, bromine, etc.)Īqueous solution (NaCl / water, alcohol / water, 10% KOH aqueous solution, etc.) The limitations of ultrasonic technology are usually the type of liquid.Īlthough there is currently no specific set of rules to measure whether liquids can be successfully atomized by ultrasound, we can give some general advice after 20 years of experience. Some of these advantages include gentle low-speed spray, controlled spray range, extensive spray forming capability and no clogging. Ultrasonic nozzles have many advantages over pressure nozzles, but still have technical limitations. In addition, it is often necessary to operate such nozzles at high pressures, which can result in overspray and consequent material loss. Pressure nozzles, whether hydraulic or pneumatic, are generally unsatisfactory for abrasive materials or materials that tend to clog small holes in the nozzle. Factors such as viscosity, solids content, composition of the mixed solution, and fluidity of the liquid. The physical properties of the liquid play a central role in any atomization process.
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