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Influence of Powder Material Moisture on the Angle of Wall Friction
Author(s) -
Fekete Roman,
Peciar Marián,
Hanzel Marián
Publication year - 2007
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.200601122
Subject(s) - materials science , capillary action , consolidation (business) , moisture , composite material , lubrication , shear force , extrusion , shear (geology) , particle (ecology) , mechanics , water content , static friction , friction angle , adhesion , geotechnical engineering , geology , physics , oceanography , accounting , business
The angle of wall friction is an important parameter which depends on the force interactions between particle material and a surface that are in contact with each other before and during motion. A standard shear testing technique for particle solids with the Jenike shear cell can be used for its determination. The composition of particle solids allows a certain volume of liquid to reside within its structure. This can be caused by atmospheric moisture or it can be created by adding the exact amount of liquid that is needed for a certain way of processing, e.g., extrusion. It also has an influence on the adhesion of wet particle matter and the friction forces during motion. The influence of the different moisture content, time of consolidation and velocity of movement of the wet powder on the friction force under different vertical forces was tested. The results show that there is a zone where the friction force increases as the moisture increases. The forces of adhesion have a significant role in this zone and the maximum value is achieved. Beyond this point there is a zone where the friction forces sharply decrease because the capillary forces are replaced by the effect of lubrication.