technology particle.ppt
TRANSCRIPT
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Yenni Listiana 120405008Hilde Rosa Tampubolon 120405109
Size distribution measurement of floating particles in the Allen regionby a buoyancy weighing-bar method
By: Rondang Tambun, Takumi Motoi, Masamitsu Shimadzu, Yuichi Ohira, Eiji ObataRondang Tambun, Takumi Motoi, Masamitsu Shimadzu, Yuichi Ohira, Eiji Obata
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What is the background of this
research ?
Stokes diameter, Andreasen pipette method, Sedimentation balance method, Centrifugal sedimentation method
Laser diffraction/scattering method ,and Coulter counter method
Time consuming and require special skills
The equipment is extremely expensive
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What is BWM?
BWM measures the change in suspension density due to particle migration by weighing the buoyancy against a weighing-tool hung in the suspension, and subsequently calculating the particle size distribution using the length of the weighing-tool and the time-course change in the apparent mass of the weighing-tool
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What’s the purpose of this research?
Theoretically, a buoyancy weighing-bar method should be applicable to measurethe particle size distribution in both the Stokes and Allen regions
Particle size x is given by the Allen formula
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How they do this research?
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1. To prepare a suspension, 1000 ml liquid and the particles to be tested were mixed in a graduated cylinder..
2. The weighing-tool was hung from an electronic precision weighing balance using a hanging wire, which did not extend due to the weight of the weighing-tool.
3. After thoroughly stirring the suspension using an agitator, the weighing-tool was set with the balance, and this was recorded as t = 0 s.
4. The measuring data, which consisted of time t and the corresponding mass of the weighing-tool, were recorded on a personal computer.
5. After the measurements, we calculated the particle size distribution of the tested particles based on the above-described theory.
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What is the materials?
The initial volume concentration of the suspension was set to 0.01, and the temperature during the experiment was maintained at 298 K. Measurements lasted 150 s.
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Spherical ParticlesSpherical ParticlesWhat is the result?
Apparent mass of the weighing-tool as a function of time
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Particle size distributions of spherical particle
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Cylindrical particleCylindrical particle
Apparent mass of the weighing-tool as a function of time
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Particle size distributions of cylindrical particle
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conclusionsconclusions
1. Although particles in the Allen region migrate, the floating particle size distributions of solid particles can be measured by the buoyancy weighing-bar method.
2. The precision of the particle size distribution is comparable to that obtained by a laser diffraction/scattering method or a sieving method.
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ありがとうございます