Effect of Assist-Air of Twin Fluid Atomizer on Urea Thermal Decomposition

Ku, Kun Woo; Hong, Jung Goo; Park, Cheol Woo

doi:10.1615/atomizspr.2015011919

Cited by 9 publications

(9 citation statements)

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“…An approximate measuring range (8–450 μm), measuring distance (within 400 mm, laser spot radius: 3.9 [pixel]), and CCD (EPIX CMOS camera) were used. SMD is measured 200 mm downstream from the tip of the nozzle (tip). − The spray image was taken using an ultra-high-speed camera (Phantom VEO E310L, maximum resolution: 512 × 512; sample rate: 11,500 f/s) and a stroboscope for the visualization of the spray from the nozzle. More than 300 images were analyzed for each experimental condition and taken after the spray pattern reaching a static state under each spray condition.…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

Effects of Y-Jet Nozzle Mixing Chamber Length and the GLR on Spatial Asymmetric Spray

2021

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The Y-jet nozzle is simpler to design than other twin-fluid nozzles and has various advantages such as having a wide turn-down ratio. For this reason, it is mainly used for industrial boilers and combustion. The Y-jet nozzle comprises liquid and assist gas supply ports, a mixing chamber, where two fluids (liquid and the assist gas) are mixed, and an exit orifice. The time it takes to mix the two fluids in the mixing chamber depends on the length of the chamber, which determines the spray and particulate properties. Therefore, the mixing chamber is one of the most important factors when designing the Y-jet nozzle. The gas to liquid mass flow rate ratio (GLR) is an important variable that affects the spray characteristics of the Y-jet nozzle. In this work, a laboratory-scale Y-jet nozzle spray experimental setup was developed to perform spray experiments. In particular, we observe the spray properties in the front and right directions to observe spatial spray properties. Significant results were obtained depending on the length of the mixing chamber, the spray pattern, and the Sauter mean diameter according to the GLR. We found that a mixing chamber with longer length reduces the effect of asymmetric spray and confirm that the central axis of spray is more stable.

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Section: Experimental Setup and Methodsmentioning

confidence: 99%

Effects of Y-Jet Nozzle Mixing Chamber Length and the GLR on Spatial Asymmetric Spray

2021

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“…The flow rate and pressure data in this experiment are the averages of sampling at 100 Hz for 10 s. , The spray image of the Y-jet nozzle was recorded by attaching a high-speed camera (Phantom VEO E310L, maximum resolution: 512 × 512, sample rate: 11,500 f/s) to the front of the nozzle and a light source to the back. Spray images were collected more than 500 times per experimental condition after ensuring that the spray pattern had attained a static state based on the spray conditions.…”

Section: Methodsmentioning

confidence: 99%

Asymmetric Spray Characteristics According to Y-Jet Nozzle Orifice Shape and Spray Conditions

2023

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The Y-jet nozzle is a twin-fluid nozzle that has a larger operating range and simpler structure than other twin-fluid nozzles. Furthermore, it offers outstanding atomization quality even at low flow rates, mak ing it simple to atomize viscous liquids. However, because of the structure of the Y-jet nozzle, having an asymmetrical spray pattern is limited. Most existing experimental studies focused on the orifice diameter and mixing tube length. In this study, two types of elliptical nozzles and one type of circular nozzle were tested. We found that the elliptical nozzle’s asymmetric spray characteristics are different from those of the circular type. Furthermore, it was demonstrated that the spray characteristics were different even in ellipsoids, with only the major and minor axes differing.

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“…35 The SMD and SMD standard deviation were measured using Malvern's Spraytech (MLXA-A12-635-5) based on the line of sight principle. 38 4.4. Experimental Conditions.…”

Section: Solution Stirring Methods and Measurement Of Propertiesmentioning

confidence: 99%

Spray Mode and Monodisperse Droplet Properties of an Electrospray

2022

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As a method of fluid atomization via application of a high voltage, electrospraying forms more uniform droplets than other spraying modes. This approach involves various spraying modes depending on the applied voltage. Most previous studies on electrospraying focused on the cone jet mode, which has limited applications since the applied voltage has a narrow range. To overcome this limitation, it is necessary to consider alternative spray modes, which require an in-depth understanding of their characteristics. To compare different spray modes, an investigation was conducted based on experimental parameters and fluid properties. In this study, a total of nine modes were identified, and the droplet characteristics in four modes were compared. The maximum deviation of the Sauter mean diameter (SMD) between the spray modes was approximately 1.7 times, and the SMD standard deviation was up to 2.8 times. In addition, the conditions required to realize Coulomb fission and monodisperse distribution depending on the Rayleigh critical charge (RSD < 6.76) were compared and examined.

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Effect of Assist-Air of Twin Fluid Atomizer on Urea Thermal Decomposition

Cited by 9 publications

References 0 publications

Effects of Y-Jet Nozzle Mixing Chamber Length and the GLR on Spatial Asymmetric Spray

Effects of Y-Jet Nozzle Mixing Chamber Length and the GLR on Spatial Asymmetric Spray

Asymmetric Spray Characteristics According to Y-Jet Nozzle Orifice Shape and Spray Conditions

Spray Mode and Monodisperse Droplet Properties of an Electrospray

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