Paper Title:

The Investigation of Arch Model Acting in Mass-Flow Hoppers

Periodical Advanced Materials Research (Volume 508)
Main Theme Measurement and Control of Granular Materials
Chapter Chapter 5:New Instruments and Sensors Development
Edited by Zhixian Jin, Zhi Xie and Guosheng Gai
Pages 135-140
DOI 10.4028/www.scientific.net/AMR.508.135
Citation Jie Guo et al., 2012, Advanced Materials Research, 508, 135
Online since April, 2012
Authors Jie Guo, Alan W. Roberts, Jan Dirk Prigge
Keywords Cohesive Arch Shape, Laser Rangefinder, Plane-Flow Silo, Three-Dimensional Surface Profile, Variable Geometry Hopper
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This paper presents the experimental results of mass-flow hopper arch geometry investigation, which was conducted using a variable geometry plane-flow bin. The cohesive arches formed under different critical outlet openings and hopper half-angles were measured using a 360° two-dimensional laser line scan system. This system was employed to obtain the complete surface profile of each arch across the width of the outlet by moving the rotating laser along the total length of the outlet. The test results were analyzed using Matlab, adopting stationary wavelet transformation de-noising to decrease the signal noise generated during the testing process. The geometric data for each single line scan was smoothed and combined to present a three-dimensional arch surface profile shown to be in good agreement with the observed experimental arch profiles. The angle η at the intersection of the arch with the hopper walls was then calculated by running a Matlab program and a new angle η' is introduced to the arch shape study. The detailed results are discussed in the paper. Arch geometry models, such as the parabolic arc and circular arc arch models developed, respectively, by Walker [ and Enstad [ are reviewed and their relevance is discussed based on the experimental results presented in this paper.

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