Simultaneous measurement of the 3D position, refractive index and droplet size of transparent spherical droplets using three-dimensional rainbow refractometry

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-02-28 DOI:10.1016/j.powtec.2025.120818

Zhiwen Deng , Zhiming Lin , Xuecheng Wu , Yuxuan Zhao , Qiwen Jin , Yingchun Wu , Yongxin Zhang , Chenghang Zheng

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引用次数: 0

Abstract

In this study, we investigate three-dimensional rainbow refractometry (TDRR) as a method for estimating the 3D position, refractive index, and droplet size of transparent spherical droplets. The principles governing the variation of rainbow signals with axial position under cylindrical lens modulation are elucidated, allowing for estimation of the droplet’s axial position based on fringe rotation angles. We also present a novel calibration technique for absolute scattering angles in TDRR measurements and propose an innovative data processing approach. A comprehensive TDRR system has been constructed to validate measurements of monodisperse water droplet flows. The results indicate that the error in 3D position measurement is less than 3%, while the absolute error in refractive index measurement is below 0.0015 and droplet size errors remain under 5%. As a new technique for simultaneous droplet positioning and multi-parameter assessment, TDRR offers significant advantages for investigating droplet interactions and dynamics in a large space.

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.