Influence of wall roughness and packing density on stagnant zone formation during funnel flow discharge from a silo: An X-ray imaging study

Abstract The paper presents an automatic method for segmenting 3D tomography images of a funnel flow area, during silo emptying process. For generating 3D images the silo model was scanned using X-ray Computed Tomography (CT) system. The method has been applied for a chosen single slice from 3D image. The image segmentation is based on the variance of pixels calculation in defined interrogation window (or kernel). The analysis of Signalto- Noise-Ratio (SNR) of the given image allows to improve the contrast in the image and facilitate the detection the boundary between funnel area and stagnant zone. The obtained results of image segmentation show a high potential in the silo flow investigation using in-situ experiment using X-ray visualization. Additionally, the study indicates that, the separation of the silo area into the funnel and stagnant zone parts is a very challenging task especially for the top and bottom area of silo where the contrast is the smallest.

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Xoob: observaciones sobre la producción de silbatos en Uayma, Yucatán

Estudios de Cultura Maya ◽

10.19130/iifl.ecm.2020.56.2.0003 ◽

2020 ◽

Vol 56 (2) ◽

pp. 73-93

Author(s):

Pedro Rogelio Xuluc Balam

Keyword(s):

Material Culture ◽

Imaging Study ◽

X Ray ◽

X Ray Imaging ◽

Maya Area ◽

Larger Sample

This work seeks an understanding of the elaboration of ceramic whistles in the community of Uayma, Yucatan. As part of the objectives, the tangible and intangible characteristics that involve the process of creating six selected aerophones from a larger sample of twelve sound artifacts were documented. The research frames the links of material culture, knowledge and technology used in the manufacture of aerophones, as well as the worldview of producers. The results of the morphology, acoustics and functionality of these artifacts are presented through an X-ray imaging study applied to the sample in order to understand the variants existing in the internal and external forms that regulate the conditions of execution, as well as the acoustics and functionality of the instrument. The present study adds, as an interpretive option, to the multiple proposals derived from the theme of production of ceramic sound artifacts for the Maya area.

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High Speed Imaging Study of the Dynamics of Ultrasonic Bubbles at a Liquid-Solid Interface

Materials Science Forum ◽

10.4028/www.scientific.net/msf.765.230 ◽

2013 ◽

Vol 765 ◽

pp. 230-234 ◽

Cited By ~ 4

Author(s):

Dong Yue Tan ◽

Jia Wei Mi

Keyword(s):

High Speed ◽

Primary Dendrite ◽

Imaging Study ◽

High Speed Imaging ◽

X Ray ◽

Dendrite Fragmentation ◽

X Ray Imaging ◽

Wave Induced ◽

Photon Source

High speed imaging, including the ultrafast synchrotron X-ray imaging facility at the beamline 32-ID-B of the Advanced Photon Source (APS), was used to study in-situ (1) the dynamics of ultrasonic bubbles inside a water suspension with an acoustic field of varied pressure; and (2) the interaction of a pulsing bubble at a primary dendrite arm tip inside a succinonitrile-1wt% camphor organic transparent alloy. A simple finite element based model was developed to simulate the stress distribution inside the dendrite due to the pulsing of the ultrasonic bubble, providing more evidence for understanding quantitatively the ultrasonic wave induced dendrite fragmentation phenomenon.

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