New apparatus for studying powder deagglomeration

Juha Kurkela, David P. Brown, Janne Raula, Esko I. Kauppinen

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

A new apparatus for studying deagglomeration of powders is presented. In many powder technology applications, it is important to know how strongly particles are adhered to each other and to what degree the particle agglomerates break up in different gas flows. In the new apparatus powders are fed in a controlled way, using a low, continuous feeding rate, into a deagglomeration zone in the apparatus. In the deagglomeration zone the powder agglomerates meet a dispersing main gas flow such that all the agglomerates experience a controllable level of turbulence. The degree of deagglomeration is determined by measuring the particle size distribution downstream of the deagglomeration zone. Particle deposition in the system is minimized by feeding sheath air through porous walls into the deagglomeration zone. When a powder is tested with various dispersing main gas flow rates, the particle size distribution as a function of a flow rate characteristics, e.g. flow Reynolds number, can be obtained. Deagglomeration tests were carried out with a powder blend consisting of 140 μm glass spheres as carrier particles and 2.5 μm silica spheres attached to the carrier spheres. The feeding with the blend was constant (typically less than ± 5%). The degree of deagglomeration increased with increasing dispersing main gas flow. Tests were also carried out with three pharmaceutical powder blends. The deagglomeration potential of any powder with sufficient flowability in any adequate gas can be tested with the presented apparatus.
Original languageEnglish
Pages (from-to)164 - 171
Number of pages8
JournalPowder Technology
Volume180
Issue number1 - 2
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

Fingerprint

Powders
Flow of gases
Particle size analysis
Flow rate
Silicon Dioxide
Drug products
Particles (particulate matter)
Reynolds number
Turbulence
Gases
Silica
Glass
Air
Pharmaceutical Preparations

Keywords

  • Particles
  • Deagglomeration
  • Powder feeder
  • Aerosols
  • Adhesion
  • Turbulent flow

Cite this

Kurkela, J., Brown, D. P., Raula, J., & Kauppinen, E. I. (2008). New apparatus for studying powder deagglomeration. Powder Technology, 180(1 - 2), 164 - 171. https://doi.org/10.1016/j.powtec.2006.10.032
Kurkela, Juha ; Brown, David P. ; Raula, Janne ; Kauppinen, Esko I. / New apparatus for studying powder deagglomeration. In: Powder Technology. 2008 ; Vol. 180, No. 1 - 2. pp. 164 - 171.
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Kurkela, J, Brown, DP, Raula, J & Kauppinen, EI 2008, 'New apparatus for studying powder deagglomeration', Powder Technology, vol. 180, no. 1 - 2, pp. 164 - 171. https://doi.org/10.1016/j.powtec.2006.10.032

New apparatus for studying powder deagglomeration. / Kurkela, Juha; Brown, David P.; Raula, Janne; Kauppinen, Esko I.

In: Powder Technology, Vol. 180, No. 1 - 2, 2008, p. 164 - 171.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - New apparatus for studying powder deagglomeration

AU - Kurkela, Juha

AU - Brown, David P.

AU - Raula, Janne

AU - Kauppinen, Esko I.

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N2 - A new apparatus for studying deagglomeration of powders is presented. In many powder technology applications, it is important to know how strongly particles are adhered to each other and to what degree the particle agglomerates break up in different gas flows. In the new apparatus powders are fed in a controlled way, using a low, continuous feeding rate, into a deagglomeration zone in the apparatus. In the deagglomeration zone the powder agglomerates meet a dispersing main gas flow such that all the agglomerates experience a controllable level of turbulence. The degree of deagglomeration is determined by measuring the particle size distribution downstream of the deagglomeration zone. Particle deposition in the system is minimized by feeding sheath air through porous walls into the deagglomeration zone. When a powder is tested with various dispersing main gas flow rates, the particle size distribution as a function of a flow rate characteristics, e.g. flow Reynolds number, can be obtained. Deagglomeration tests were carried out with a powder blend consisting of 140 μm glass spheres as carrier particles and 2.5 μm silica spheres attached to the carrier spheres. The feeding with the blend was constant (typically less than ± 5%). The degree of deagglomeration increased with increasing dispersing main gas flow. Tests were also carried out with three pharmaceutical powder blends. The deagglomeration potential of any powder with sufficient flowability in any adequate gas can be tested with the presented apparatus.

AB - A new apparatus for studying deagglomeration of powders is presented. In many powder technology applications, it is important to know how strongly particles are adhered to each other and to what degree the particle agglomerates break up in different gas flows. In the new apparatus powders are fed in a controlled way, using a low, continuous feeding rate, into a deagglomeration zone in the apparatus. In the deagglomeration zone the powder agglomerates meet a dispersing main gas flow such that all the agglomerates experience a controllable level of turbulence. The degree of deagglomeration is determined by measuring the particle size distribution downstream of the deagglomeration zone. Particle deposition in the system is minimized by feeding sheath air through porous walls into the deagglomeration zone. When a powder is tested with various dispersing main gas flow rates, the particle size distribution as a function of a flow rate characteristics, e.g. flow Reynolds number, can be obtained. Deagglomeration tests were carried out with a powder blend consisting of 140 μm glass spheres as carrier particles and 2.5 μm silica spheres attached to the carrier spheres. The feeding with the blend was constant (typically less than ± 5%). The degree of deagglomeration increased with increasing dispersing main gas flow. Tests were also carried out with three pharmaceutical powder blends. The deagglomeration potential of any powder with sufficient flowability in any adequate gas can be tested with the presented apparatus.

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KW - Deagglomeration

KW - Powder feeder

KW - Aerosols

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DO - 10.1016/j.powtec.2006.10.032

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JO - Powder Technology

JF - Powder Technology

SN - 0032-5910

IS - 1 - 2

ER -

Kurkela J, Brown DP, Raula J, Kauppinen EI. New apparatus for studying powder deagglomeration. Powder Technology. 2008;180(1 - 2):164 - 171. https://doi.org/10.1016/j.powtec.2006.10.032