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Title: Vacuum assisted flow initiation in arching powders
Authors: Sinka, Iosif Csaba
Baserinia, R.
Rajniak, P.
First Published: 7-Apr-2016
Publisher: Elsevier
Citation: Powder Technology, 2016, 301, pp. 493-502
Abstract: The discharge of powders from hoppers usually takes place in open atmosphere. However, in powder pressing industries (e.g. manufacturing of pharmaceutical tablets, detergents, ceramics, powder metallurgy etc.) there are handling operations where powders are filled into closed cavities such as dies. During this process the air pressure is increased as powder is delivered into the die. At the same time typical tablet production equipment creates a suction effect. A critical orifice measurement apparatus was developed to study powder flow initiation from an arching state into an enclosure where the air pressure is reduced. It was shown that a very small reduction of pressure changed the critical orifice diameter significantly. Dimensional analysis was carried out to relate powder properties (particle size and density) and processing parameters (geometry of the system and differential pressure necessary to break the arch). A relationship was developed to calculate the pressure difference necessary to initiate powder flow. The relationship has two empirical parameters which are calibrated by performing simple experiments using the testing rig developed.
DOI Link: 10.1016/j.powtec.2016.03.051
ISSN: 0032-5910
eISSN: 1873-328X
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2016 Published by Elsevier B.V. The file associated with this record is distributed after the end of the embargo period under the Creative Commons “Attribution Non-Commercial No Derivatives” licence, further details of which can be found via the following link:
Description: The file associated with this record is under a 24-month embargo from publication in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.
Appears in Collections:Published Articles, Dept. of Engineering

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