Multifunctional, three-dimensional tomography for analysis of eletrectrohydrodynamic jetting. (May 2015)

• Record Type: Journal Article
• Authors: Nguyen, Xuan Hung; Gim, Yeonghyeon; Ko, Han Seo
• Is Part Of: Optics and lasers in engineering. Volume 68(2015)
• Page Start: 235
• Page End: 243
• Publication Date: 2015-05
• Subjects: Tomography -- Electrohydrodynamic jetting -- Shadowgraphic image -- Circulating flow -- Cone jet; Lasers in engineering -- Periodicals; Optical measurements -- Periodicals; Optics -- Periodicals; Lasers en ingénierie -- Périodiques; Mesures optiques -- Périodiques; Optique -- Périodiques; 621.36605
• DOI: 10.1016/j.optlaseng.2015.01.006
• Languages: English
• ISSNs: 0143-8166

Abstract

Abstract: A three-dimensional optical tomography technique was developed to reconstruct three-dimensional objects using a set of two-dimensional shadowgraphic images and normal gray images. From three high-speed cameras, which were positioned at an offset angle of 45° between each other, number, size, and location of electrohydrodynamic jets with respect to the nozzle position were analyzed using shadowgraphic tomography employing multiplicative algebraic reconstruction technique (MART). Additionally, a flow field inside a cone-shaped liquid (Taylor cone) induced under an electric field was observed using a simultaneous multiplicative algebraic reconstruction technique (SMART), a tomographic method for reconstructing light intensities of particles, combined with three-dimensional cross-correlation. Various velocity fields of circulating flows inside the cone-shaped liquid caused by various physico-chemical properties of liquid were also investigated. Highlights: We develop the three-dimensional optical tomography technique. We analyze the electrohydrodynamic jet using multiple high-speed cameras by the MART. The flow field inside the cone-shaped liquid under the electric field is observed. Various velocity fields of circulating flows of liquid are investigated. The developed tomographic PIV reconstructs the complex circulating flow.