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Volume 20, Issue 1
Displaying 1-7 of 7 articles from this issue
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Tadao ISSIKI, Takayuki YAGINUMA1983 Volume 20 Issue 1 Pages 3-7
Published: January 10, 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe author derived a theoretical equation on the relationship between the pressure drop and the time when clossed-up Air flows out through Porous a Media
p-p0=(P0-p0)e-Kp0A/V0ht
Notation
p: pressure in vessel after t seconds
p0: atmospheric pressure
P0: initial pressure in vessel
V0: volume of air in vessel
K: permeability coefficient
A: sectional area of packed bed
h: thickness of packed bed
t: time
This equation agrees with the test data.View full abstractDownload PDF (453K) -
Shigehisa ENDOH, Jiro KOGA, Kenji YAMAGUCHI1983 Volume 20 Issue 1 Pages 8-14
Published: January 10, 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe effects of particle shape and operating conditions on the sieving process of cylinder particles were experimentally studied. A fixed. mass of cylinders of the same size and shape was placed on a reciprocating sieve. The retension on the sieve was measured, and the sieving rates were obtained.
When the cylinder diameter was of easily screenable particles, the retension exponentially decreased with time. For particles near the mesh, the sieving rate was initially influenced by the particle mass on the sieve. The sieving process deviated from the exponential decrease.
The rate coefficients of sieving of easily screenable particles were inversely proportional to the third power of the cylinder length. The probabilities of the cylinder passing through an opening were calculated and compared with those of the experimental results. The number of trials of passing per unit time was almost inversely proportional to the length.
The previous relationship for the optimum shifting conditions was applicable to the cylinder particles.View full abstractDownload PDF (682K) -
Kanji MATSUMOTO, S. OMENYI, C. E. CAPES1983 Volume 20 Issue 1 Pages 15-21
Published: January 10, 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA novel procedure, called the constant flow method (CF Method), is proposed for determining the wettability of particles. Experimentally, liquid is fed at a constant flow rate in to the measuring system in which the pressure required for the liquid to penetrate a bed of the particles is monitored. With hydrophobic particles the pressure increases until the liquid begins to penetrate the particle bed. With hydrophilic particles the pressure due to imbibition when the liquid level reaches the bottom of the bed. In both cases, however, the pressure remained nearly constant for a short time when the lipuid first penetrated the bed. This constant pressure is characteristic of the CF Method and can be interpreted in terms of the wettability of the particles.
The experimental results showed that the CF Method was effective in measuring the wettability of hydrophobic particles, but some problems existed in its application to hydrophilic particles.View full abstractDownload PDF (851K) -
Hirosuke HAYASHI, Toshihiko KASANO, Kiyoharu SUHARA1983 Volume 20 Issue 1 Pages 22-27
Published: January 10, 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSCoarser particles were mixed with other powders in order to make the powder suitable for dispensing and to improve its physical properties. The effect of the mixing ratio on the physical properties and on the uniformity were subsequently investigated.
The following result were obtained:
1. When crystals and granules with coarser particles were mixed with sodium bicarbonate powder (below 77μm) the angle of repose and the ratio of loss in the apparent specific volume decreased in proportion to the amount of the coarser particles added, and the dispersibility became larger.
2. The physical propeties of sodium bicarbonate were almost independent of the particle sizes and greatly varied with the mixing ratio of the large particles added.
3. If the mixing ratio of the coarser particles were the same, tha larger the particle size, the poorer the uniformity. If there was less than 50% of coaser particles the uniformity was nearly independent of the particle size in the range from 250μm and 840μm and became slightly poorer with the coarser particles. However, a particle size decrease to 840-1410μm made the uniformity very poor. If the coarser particles comprised 70% of the mixture, the uniformity became poorer with the coarser particles.View full abstractDownload PDF (655K) -
Hideharu HIROSUE, Masaharu TANII, Hiroshi IHARA1983 Volume 20 Issue 1 Pages 28-31
Published: January 10, 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe optimum dispersive condition for fine particles in water was determined from the measurements of the zeta potential, the mass and specific volume of sediments and the particle size distribution at concentrations of sodium-hexametaphosphate, Na-HMP showing strong dispersive power. As a result, it was recognized that the optimum dispersion was established at the concentration of Na-HMP giving the lowest specific volume of sediment which has already been known and also at the concentration of Na-HMP giving the lowest mass of sediment. Therefore, it seems that this method of finding a Na-HMP concentration to give the lowest mass of sediment could be adopted to conveniently determine the optimum concentration of a dispersant.View full abstractDownload PDF (459K) -
Takatoshi SHIMA1983 Volume 20 Issue 1 Pages 32-35
Published: January 10, 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2198K) -
Masakazu IKEDA1983 Volume 20 Issue 1 Pages 43-44
Published: January 10, 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1867K)
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