Light intensity distributions of the Gaussian laser beam through an aperture team

Xu, Yonggen; Li, Yude; Qiu, Yi

doi:10.1080/09500340903398440

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…As shown in Figure 1(a) and 1(c), alternating large and small vortices are generated mainly by alternating Gaussian light incidents vertically from the geometrically asymmetric position of the droplet. To better describe the incident position of Gaussian light, the light intensity expression can be written as follows (Xu et al , 2009; Chraibi et al , 2011; Gupta et al , 2020): …”

Section: Problem Descriptionmentioning

confidence: 99%

Light-driven mixing strategy inside a nanofluid droplet by asymmetrical Marangoni flow

Liu

Wu²,

Chen³

et al. 2022

HFF

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Purpose The purpose of this study is to establish an effective numerical simulation method to describe the flow pattern and optimize the strategy of noncontact mixing induced by alternating Gaussian light inside a nanofluid droplet and analyzing the influencing factors and flow mechanism of fluid mixing inside a droplet. Design/methodology/approach First, the heat converted by the alternating incident Gaussian light acting on the nanoparticles was considered as the bulk heat source distribution, and the equilibrium equation between the surface tension and the viscous force at the upper boundary force was established; then, the numerical simulation methods for multiple-physical-field coupling was established, and the mixing index was used to quantify the mixing degree inside a droplet. The effects of the incident position of alternating Gaussian light and the height of the droplet on the mixing characteristics inside a droplet were studied. Finally, the nondimensional Marangoni number was used to reveal the flow mechanism of the internal mixing of the droplet. Findings Noncontact alternating Gaussian light can induce asymmetric vortex motion inside a nanofluid droplet. The incident position of alternating Gaussian light is a significant factor affecting the mixing degree in the droplet. In addition, the heat transfer caused by the surface tension gradient promotes the convection effect, which significantly enhances the mixing of the fluid in the droplet. Originality/value This study demonstrates the possibility of the chaotic mixing phenomenon induced by noncontact Gaussian light that occurs within a tiny droplet and provides a feasible method to achieve efficient mixing inside droplets at the microscale.

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Section: Problem Descriptionmentioning

confidence: 99%

Light-driven mixing strategy inside a nanofluid droplet by asymmetrical Marangoni flow

Liu

Wu²,

Chen³

et al. 2022

HFF

View full text Add to dashboard Cite

show abstract

Anti-biofouling superhydrophobic surface fabricated by picosecond laser texturing of stainless steel

Sun

Yang

Wang

et al. 2018

Applied Surface Science

177

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Evenly brightening using kurtosis Gaussian pattern to simplify image binarization

Mulyana

Herlina

2019

J. Phys.: Conf. Ser.

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A problem of separating object from background using thresholding in image segmentation is uneven image brightness. Some binary image objects vanish because the pixel intensity value on the edge side is greater than the pixel’s background intensity. The others at the edge of image are covered by background pixel. The background pixel at the edge is bigger than the pixel value of the object in the inside of image. A light source type affects the spread of brightness adding thresholding difficulty. The object’s light distribution from the exposed light source follows the Gaussian distribution. A kurtosis value depends on the light source type. Following the kurtosis of standard deviation, the method for creating brightness evenly is designed. The Gaussian pattern is formed from the distribution of Gaussian values in the cells of the Gaussian matrix. The pixel values in the corresponding images will be added to the matrix cells. The pixel value will increase according to the Gaussian matrix pattern. This process results in the highest pixel value not getting added value, while the lowest pixel intensity value will get the greatest value addition.

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Light intensity distributions of the Gaussian laser beam through an aperture team

Cited by 3 publications

References 13 publications

Light-driven mixing strategy inside a nanofluid droplet by asymmetrical Marangoni flow

Light-driven mixing strategy inside a nanofluid droplet by asymmetrical Marangoni flow

Anti-biofouling superhydrophobic surface fabricated by picosecond laser texturing of stainless steel

Evenly brightening using kurtosis Gaussian pattern to simplify image binarization

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