Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.
2009
Volume 12
Issue 2
Topic:
Agricultural Engineering
ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Stasiak M. , Tomas J. , Molenda M. , Müller P. 2009. COMPRESSION AND FLOW BEHAVIOUR OF COHESIVE POWDERS, EJPAU 12(2), #09.
Available Online: http://www.ejpau.media.pl/volume12/issue2/abs-09.html

COMPRESSION AND FLOW BEHAVIOUR OF COHESIVE POWDERS

Mateusz Stasiak1, Jürgen Tomas2, Marek Molenda1, Peter Müller2
1 Department of Physical and Technological Properties of Agricultural Materials, Institute of Agrophysics, Polish Academy of Science, Lublin, Poland
2 Department of Mechanical Process Engineering, Otto-von-Guericke University, Magdeburg, Germany

 

ABSTRACT


Research was conducted to examine the influences of consolidation
time, consolidation pressure, temperature, addition of lubricant, speed of deformation
and dimension of the probe on properties of two powders – microcrystalline cellulose
(MCC) and potato starch (PS). A low pressure range (up to 10 kPa) was applied
in direct shear test to determine flowability and friction properties. A medium
pressure range (50–1000 kPa) was applied in the press shear cell to evaluate
friction properties of MCC. The compression behaviour of MCC was determined in
uniaxial compression tests at high pressure range (30–60 MPa).

A strong influence of consolidation time on
flow function was observed. In the case of PS a strong slip stick effect was
also noted. An increase in temperature from 23°C to 40°C resulted in
a 10% increase of the internal friction angle value determined in the press shear
cell in the range of preshear displacement from 0.1 to 2 m. There were no
strong influences of temperature, speed of deformation and initial sample height
on compression behaviour determined in uniaxial compression tests at high pressure
range.

Key words: powder, flowability, compressibility, slip-stick effect.

Mateusz Stasiak
Department of Physical and Technological Properties
of Agricultural Materials, Institute of Agrophysics,
Polish Academy of Science, Lublin, Poland
Do¶wiadczalna 4,
P.O. Box 201, 20-290 Lublin 27, Poland
Phone: (+48) 81 743 85 58
Fax: (+48) 81 744 50 67
email: mstasiak@ipan.lublin.pl

Jürgen Tomas
Department of Mechanical Process Engineering,
Otto-von-Guericke University, Magdeburg, Germany


Marek Molenda
Department of Physical and Technological Properties
of Agricultural Materials, Institute of Agrophysics,
Polish Academy of Science, Lublin, Poland
Do¶wiadczalna 4,
P.O. Box 201, 20-290 Lublin 27, Poland

Peter Müller
Department of Mechanical Process Engineering,
Otto-von-Guericke University, Magdeburg, Germany

Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.

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