Effects of Working Fluids on Spray Modes and Atomization Characteristics in Electrospray

Kim, Ji Yeop; Lee, Sang Ji; Baik, Gwang Yeol; Hong, Jung Goo

doi:10.7736/jkspe.020.100

Cited by 6 publications

(10 citation statements)

References 11 publications

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“…More than 300 images were analyzed per experimental condition, and after the applied voltage reached a static state, the spray pattern was visualized. 36 In the case of lighting, the subject was photographed using one back light and two front incident lights. In the back light, it is better to check the details of the shape when photographing nonobjects than the back light, and in the front light, the outline of the droplet can be emphasized and the shape is excellent.…”

Section: Discussionmentioning

confidence: 99%

“…Spray flow visualization images were taken using a high-speed camera (Phantom VEO E310L, maximum resolution: pixels 1200 × 800, sample rate: 11,500 f/s) and a stroboscope. More than 300 images were analyzed per experimental condition, and after the applied voltage reached a static state, the spray pattern was visualized …”

Section: Methodsmentioning

confidence: 99%

“…The SMD and droplet distribution sprayed from the nozzle are Malvern-type droplets using the laser diffraction principle. A measuring device (MLXA-A12-635-5) was used. − A DMM650 ammeter (Keithley) was used to conduct the experiment by acquiring a current value of 1000 times per s using the software.…”

Section: Methodsmentioning

confidence: 99%

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Viscosity Effect on the Electrospray Characteristics of Droplet Size and Distribution

et al. 2021

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Electrostatic spraying is a method of atomizing a fluid using a high voltage as an atomization auxiliary device, and various spraying modes exist according to experimental parameters and viscosity. A maximum of 11 spray modes were identified according to the changes in the applied voltage and flow rate. To produce fine droplets and a uniform size, which are the advantages of electrostatic spraying, in this experiment, the Sauter mean diameter (SMD) and SMD distribution were evaluated in each spray mode of electrostatic spraying. By comparing the other spray modes with the cone jet mode, it was confirmed that the maximum difference of the SMD was less than 1.5 times and the standard deviation of the rotated and pulsed jets was 2.5 times or more. In the cone shape range, the SMD and SMD distribution according to the applied voltage confirmed that the droplet size was the smallest in the middle of the cone jet mode, and the droplet distribution was also narrow. In the cone jet mode, the droplet size increased linearly with the viscosity and flow rate. In addition, the droplet distribution range was distinctive depending on the type of fluid. In the case of the relationship between the droplet size and current, it was proven that the higher the viscosity, the higher the current value for the same SMD; furthermore, the difference in the current–SMD increase rate was insignificant. Through experiments, this work presents experimental data of SMD, SMD distribution, and current–SMD in electrostatic spray experiments under various conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Viscosity Effect on the Electrospray Characteristics of Droplet Size and Distribution

et al. 2021

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“…In addition, an experiment was conducted by slowly increasing the applied voltage using an internal controller to minimize hysteresis. 37 …”

Section: Methodsmentioning

confidence: 99%

“…The spray pattern images were captured after the spray mode reached a steady state for the applied voltage. 37 For lighting purposes, three backlights and two front incident lights were used to capture images of the subject. A total of five backlights and front incident lights were used since the former was useful for observing the details of the shape, and the latter allowed the outline of the spray mode to be more easily distinguishable.…”

Section: Methodsmentioning

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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Experimental Investigation of Electrospraying Properties Based on Ring Electrode Modification

Kim,

Lee,

Lee

et al. 2023

ACS Omega

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Electrospraying uses a high-voltage potential difference to create fine droplets. This study conducts a comparative analysis of the spray pattern and droplet properties using ring electrode parameters. The spray pattern and droplet characteristics are analyzed based on the experimental parameters of the ring electrode. The results show that the cone-jet mode forms quickly for the ring electrode. In addition, as the ring diameter decreases, the ring voltage increases and an increase in the distance between the ring and the nozzle in the bottom direction decreases the Sauter mean diameter and its standard deviation. The optimal conditions for the formation of fine and uniform droplets include a ring diameter of 15 mm, a ring voltage of 7 kV, and a nozzle-to-ring distance of (+) 20 mm.

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Effects of Working Fluids on Spray Modes and Atomization Characteristics in Electrospray

Cited by 6 publications

References 11 publications

Viscosity Effect on the Electrospray Characteristics of Droplet Size and Distribution

Viscosity Effect on the Electrospray Characteristics of Droplet Size and Distribution

Spray Mode and Monodisperse Droplet Properties of an Electrospray

Experimental Investigation of Electrospraying Properties Based on Ring Electrode Modification

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