On the rate of descent of powder in a vibrating tube
On the rate of descent of powder in a vibrating tube
The flow rate of powder in an open vertical capillary subject to transverse acoustic vibration is predicted using an explicit equation by considering the intermittent arrest and stasis of particles subject to acceleration in a field. The analysis rests solely on physical quantities that are easily measured by experiment. The calculation is supported by measured flow rate and by direct observation using high speed photography. Increasing the horizontal component of acceleration of a particle should not influence rate of descent but the overall time of flight is increased both by re-initiation of descent after collision at the wall and by fixed stationary periods on each cycle. Since flow stops when acoustic vibration stops, the vibrating tube is a valve that provides computer-controlled powder flow metering, mixing and dispensing. The valve is capable of adjusting the flow rate with a ratio of minimum to maximum flow rate of 0.1. It is being used to make three-dimensional functional gradients by solid freeforming operations, notably selective laser sintering.
1089-1109
Yang, S
e0018adf-8123-4a54-b8dd-306c10ca48f1
Evans, J.R.G.
6f6c8a4c-24ac-4144-a555-51438e4d40e0
April 2005
Yang, S
e0018adf-8123-4a54-b8dd-306c10ca48f1
Evans, J.R.G.
6f6c8a4c-24ac-4144-a555-51438e4d40e0
Abstract
The flow rate of powder in an open vertical capillary subject to transverse acoustic vibration is predicted using an explicit equation by considering the intermittent arrest and stasis of particles subject to acceleration in a field. The analysis rests solely on physical quantities that are easily measured by experiment. The calculation is supported by measured flow rate and by direct observation using high speed photography. Increasing the horizontal component of acceleration of a particle should not influence rate of descent but the overall time of flight is increased both by re-initiation of descent after collision at the wall and by fixed stationary periods on each cycle. Since flow stops when acoustic vibration stops, the vibrating tube is a valve that provides computer-controlled powder flow metering, mixing and dispensing. The valve is capable of adjusting the flow rate with a ratio of minimum to maximum flow rate of 0.1. It is being used to make three-dimensional functional gradients by solid freeforming operations, notably selective laser sintering.
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Published date: April 2005
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 165079
URI: http://eprints.soton.ac.uk/id/eprint/165079
ISSN: 1478-6435
PURE UUID: 0b0e2584-f361-475c-8b72-d047011f3be6
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Date deposited: 07 Oct 2010 14:06
Last modified: 14 Mar 2024 02:09
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Author:
J.R.G. Evans
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