Precise size distribution measurement of aerosol particles and fog droplets in the open atmosphere

Di, Huige; Wang, Zhixiang; Hua, Dengxin

doi:10.1364/oe.27.00a890

Cited by 20 publications

(6 citation statements)

References 23 publications

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“…Limmat Scientific Ag (LSC) developed and will provide an optical instrument for the test-rig able to measure the droplet size (20-120μm in diameter) and speed. It employs forward scattering laser lights [4,5]: the amount of light scattered by droplets is proportional to the size of the droplet and the intensity of the incident light.…”

Section: Figure 2 Test Rig Cad 3d and Fluid Passagesmentioning

confidence: 99%

Two-phase flow expansion: development of an innovative test-rig for flow characterisation and CFD validation

et al. 2019

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The aim of this work is to describe the design of an innovative test rig for investigating the expansion of saturated fluids in the two-phase region. The experimental test rig was thought up and built by TPG of the University of Genoa. It will be equipped by probes and some optical accesses that permit high speed video recording and laser measurements. It will be useful for the study of the quality ratio, vapour and liquid droplet thermodynamic properties and their speed.

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Section: Figure 2 Test Rig Cad 3d and Fluid Passagesmentioning

confidence: 99%

Two-phase flow expansion: development of an innovative test-rig for flow characterisation and CFD validation

et al. 2019

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“…Te results indicate that local airfow trajectories mainly afect water vapor transport below the boundary layer, and that these fows are closely related to the formation of fog and haze events in the Xi'an area [12]. Di et al proposed a method to measure the aerosol and fog particle size distribution by optimizing scattering angle and wavelengths; seven wavelengths for extinction coefcients and fve wavelengths for forward scattering coefcients were chosen for the retrieval of particle size distribution in the measurement [13]. Zeng et al studied the propagation of linear and circular polarization in fog, and comparing their transmission characteristic with diferent condition, investigated the transmission performance of circular and linear polarization in variable foggy environments, exploring the impact of the detection range in particular [14].…”

Section: Introductionmentioning

confidence: 99%

The Multiple Scattering of Laser Beam Propagation in Advection Fog and Radiation Fog

Qiang

Cao

Zhang

et al. 2023

International Journal of Optics

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The laser beams were scattered and attenuated when they propagate in fogs for laser communication, laser remote sensing detection. For different density and droplets distribution of fogs, the laser scatter and attenuation are different, the correspond mechanism need thorough investigation. The characteristics of laser beam scattering in different types of fogs are studied based on the droplet size characteristics of advection fog and radiation fog, the scattering coefficients of droplets with different laser wavelengths(0.86 μm, 0.91 μm, 1.06 μm, 1.3015, and 10.6 μm) are calculated, the multi scattering of laser beam is studied by the Monte Carlo method, the propagation path and scattering direction of photons is analyzed, relations between asymmetry factor, albedo of fog droplets, and the visibility are presented, and the forward scattering intensity and the backward scattering intensity versus scattering angle are gotten and discussed.

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“…2,3 Fog is an aerosol system composed of tiny water droplets range from 1 μm to 50 μm suspended in the air. 4 The fog collectors are installed vertically, perpendicular to the wind direction, and separate fog water droplets suspended in the air. 3 The wind flow is responsible to push the tiny fog droplets towards the fog collector, and only a portion of droplets will be captured and collected on the collector surface.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the geometrical parameters of collector mesh on the fog collection efficiency

Zefrehei

Sheikhzadeh

Pishevar

2022

Journal of Industrial Textiles

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Fog collectors have gained increasing attention as an efficient solution to overcome the water scarcity concerns in arid and semiarid environments. Besides the rapid advances made in various collector designs, the role of geometrical characteristics of the fog collector meshes is not fully understood. Therefore, the main objective of the present research is to address this issue and investigate the effects of textile features on the efficiency of conventional meshes which has not been discussed in previous works. The collection efficiencies of various conventional structures (plain-woven, plain-knitted, and 3-D spacer) with different characteristics (fiber diameter, fiber spacing, fiber arrangement, shading coefficient, and test direction) were investigated using a custom-made fog collecting device. The weight of collected water over time and the onset time were measured to assess the performance of different samples. Moreover, a simple simulation of a plain-woven structure was developed using Computational Fluid Dynamics (CFD) to perform further analysis. The results revealed that in the woven structure, the collection efficiency was improved by changing the shading coefficient to an optimum value and simultaneous decreasing fiber diameter. In the spacer fabrics, the position and arrangement of the spacer fibers posed considerable effects on the collection efficiency. 3-D spacer meshes showed highest value of collection efficiencies and onset time in comparison to the other examined meshes. The results of simulation of woven structures were also validated by comparing computed and measured collection efficiencies.

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Precise size distribution measurement of aerosol particles and fog droplets in the open atmosphere

Cited by 20 publications

References 23 publications

Two-phase flow expansion: development of an innovative test-rig for flow characterisation and CFD validation

Two-phase flow expansion: development of an innovative test-rig for flow characterisation and CFD validation

The Multiple Scattering of Laser Beam Propagation in Advection Fog and Radiation Fog

Evaluation of the geometrical parameters of collector mesh on the fog collection efficiency

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