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Volume 7 (1974 - 1975･･･
- Issue 6 Pages 407-
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Volume 7, Issue 6
Displaying 1-20 of 20 articles from this issue
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MAKOTO HARADA, MASATAKA TANIGAKI, AKIRA NISHIMURA, WATARU EGUCHI1975 Volume 7 Issue 6 Pages 407-413
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSA relaxation model is proposed taking both the oscillatory and dissipative modes of motion into consideration. The resultant velocity auto-correlation function is of the damped oscillatory pattern. Self-diffusivity and shear viscosity of a simple saturated liquid can be predicted from the equations derived from the model with the configurational internal energy and a parametric density which is characteristic to the substance. This density determines the probability of dissipative mode of motion. A simple relation of corresponding states holds for several liquids by employing the reduced density, which is the ratio of liquid density to the parametric density.View full abstractDownload PDF (1184K) -
HISAHIKO WATANABE, TERUKATSU MIYAUCHI1975 Volume 7 Issue 6 Pages 413-416
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSA set of simple equations has been proposed previously which correlate the diffusivities of non-polymeric and polymeric molecules in polymeric medium to easily measurable quantities such as viscosity, temperature and molecular weight. These equations are further examined in this work by the use of literature data. The literature data of polydimethylsiloxane system and polystyrene system of various molecular weights show good agreement with theory. It is also shown that the constants which appear in the equation for the two-component system and those for the one-component system are the same in order of magnitude.View full abstractDownload PDF (641K) -
SHINJI TAKAHASHI1975 Volume 7 Issue 6 Pages 417-420
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSA new generalized chart analogous to that of Slattery and Bird (SB chart) was prepared from the observed values of the self- and binary-diffusion coefficients of gases at high pressures. The deviation of the values produced by the new chart from those observed is 4.1% on the average, whereas that of the values produced by the SB chart is 7.9%. In addition the new chart gives the average of the values observed, whereas the SB chart gives lower values for most of the systems.View full abstractDownload PDF (695K) -
Em SARASHINA, YASUHIKO ARAI, SHOZABURO SAITO1975 Volume 7 Issue 6 Pages 421-425
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe empirical molecular shape factors for ammonia relative to methane as a reference were correlated for 0.7≤Tr≤, 1.4 and 0<Pr≤30. They could well represent the compressibility factors and the fugacity coefficients of ammonia.
On the basis of the corresponding-states principle, the vapor-liquid equilibria of binary systems containing ammonia were predicted by using pseudo-potential parameters, obtained by the van der Waals one-fluid theory coupled with molecular shape factors. Good results were obtained except in high pressure ranges.View full abstractDownload PDF (776K) -
SHIGERU MATSUMOTO, MICHIO KARA, SHOZABURO SAITO, SIRO MAEDA1975 Volume 7 Issue 6 Pages 425-430
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe minimum transport velocity, that is, the mean air velocity required to prevent the settling of particles on the bottom of a horizontal pipe, was experimentally studied for granular particles. Two pipe sizes were used, 26 mm and 49 mm diameter, and 14 groups of solid particles ranging from 0.3 mm to 2 mm diameter were used. A general correlation for minimum transport velocity was obtained including density and size of solid particles and pipe diameter. The saltation point, at which the flow pattern changed from suspension flow to sliding flow, was also correlated on the basis of a simple theoretical consideration.View full abstractDownload PDF (1016K) -
MACRO- AND MICRO-PORE SERIES DIFFUSION MODELKUNITARO KAWAZOE, YASUSHI TAKEUCHI1975 Volume 7 Issue 6 Pages 431-437
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSConsidering pore size distribution of adsorbent particles to be bidispersed and assuming diffusion within the particles in series from macro- to micro-pores and vice versa, theoretical equations of fixed-bed breakthrough curves for a linear adsorption isotherm system are derived and intraparticle diffusion resistance for two cases is given.
Adsorption of Kr-85 on activated carbon of several particle sizes with different amounts of FeCl3 deposition was studied to assertain the applicability of the derived equations and resistances of both macro- and micro-pore diffusion were also evaluated.
The difference of diffusion resistances from steady-state and from dynamic method is discussed.View full abstractDownload PDF (1070K) -
NORIAKI WAKAO, YOSHIHIRO IIDA, SHIGEHARU TANISHO1975 Volume 7 Issue 6 Pages 438-440
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe axial fluid dispersion coefficients in packed beds were found to be Dax/Dv=0.65 at Reynolds numbers 0.0022-1.8 for particle sizes 0.066-4.6 mm. In evaluating the dispersion coefficients, transfer function evaluation method looked better than either moment method or Fourier analysis.View full abstractDownload PDF (375K) -
TSUNEO SEKIZAWA, HIROSHI KUBOTA1975 Volume 7 Issue 6 Pages 441-446
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSLongitudinal liquid mixing in a concurrent multistage bubble column partitioned by perforated plates was observed by means of the thermal tracer technique. The mixing characteristic was expressed by combining the backflow through the plate and the dispersion in each stage. The backflow ratio of liquid through plate κ, which was defined by the ratio of backflow rate to the net flow rate of liquid, was independent of plate spacing and column diameter, and was affected by gas velocity uG, liquid velocity uL, free area of plate Ar, hole diameter of plate d0, plate thickness δ and liquid viscosity μ. The values of κ are empirically correlated with uG, UL, Ar, do, δ and μ. The dispersion coefficient in stage was smaller than that in the bubble column without partition plate.View full abstractDownload PDF (893K) -
EXPERIMENTAL RESULTSRYOZO TOEI, RYUICHI MATSUNO, MORIHIRO OICHI, KATSUNOBU YAMAMOTO1975 Volume 7 Issue 6 Pages 447-450
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe behavior of deformations and splittings of a single bubble was studied experimentally in a two-dimensional fluidized bed. It was found that small downward cusps were generated at the bubble surface near the stagnation point and that they grew and necessarily caused bubble deformations and, frequently, bubble splittings. The authors call these cusps "disturbances".
The frequencies of disturbances and splittings were observed and the following results were found. 1) About 4-8 disturbances were generated per second almost near the stagnation point, and they ran along the edge of a bubble to be lost near the wake; 2) about 14-30 percent of the disturbances also caused bubble splittings; 3) there were two types of splittings; 4) the frequencies of distrubances and splittings decreased with increase of particle diameter; and 5) neither frequency depended much on bubble diameter.View full abstractDownload PDF (642K) -
THEORETICAL CALCULATIONSRYOZO TOEI, RYUICHI MATSUNO, MORIHIRO OICHI, KATSUNOBU YAMAMOTO1975 Volume 7 Issue 6 Pages 451-455
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSTo explain experimental results of bubble deformations and splittings, a model assuming that these phenomena come from the growing of a disturbance generated at the bubble surface near the stagnation point is proposed. The motion of particles is expressed by the velocity potential around a steadily rising bubble. Under the condition of constant pressure within a bubble, the differential equations for the bubble deformation were derived from the velocity potential and were solved with the initial condition that the disturbance was generated at time 7=0. It was assumed that the disturbance is presented as the centripetal velocity of particles superposed on the normal velocity at the bubble surface. The bubble splitting was also calculated by the same model for the case of stronger intensity of disturbance. Calculated results agree qualitatively with experimental values of bubble deformations and splittings.View full abstractDownload PDF (876K) -
KAZUYUKI HOTTA, NOBORU YAMAMURO, KOICHI IINOYA1975 Volume 7 Issue 6 Pages 455-461
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSDamping characteristics of a pulse-wise temperature peak along a naturally cooled hot gas duct is studied experimentally with possible applications to bag filter systems in mind. In face of changes in gas properties, due to the temperature change, a linear model is found useful for approximate prediction of the transient. Charts for estimating the peak height of the outlet gas temperature are contrived to be readily used by design and operation engineers.View full abstractDownload PDF (1138K) -
SHIRO ITO, SHOJI URUSHIYAMA, KOHEI OGAWA1975 Volume 7 Issue 6 Pages 462-466
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSFor measuring three-dimensional turbulence velocities, a new technique based on electrochemical reaction controlled by mass transfer rate is developed. The measuring probe for this method consists of a plastic sphere in which more than three polarized electrodes are plugged, their surfaces flush with the sphere surface. By making use of this measuring probe threedimensional turbulence properties can be measured more correctly. An example of the application of this method for measurement of flow in a stirred vessel is shown.View full abstractDownload PDF (798K) -
TAKAO KOKUGAN, NOBUYUKI ISHIZAKA, MASARU SHIMIZU1975 Volume 7 Issue 6 Pages 467-469
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSDownload PDF (454K) -
TAKEHIKO FURUSAWA, J. M. SMITH1975 Volume 7 Issue 6 Pages 470-472
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
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NORIAKI WAKAO, KENJI TANAKA1975 Volume 7 Issue 6 Pages 472-473
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSDownload PDF (269K) -
THE CASE OF LARGE INITIAL CONCENTRATION OF FINESISAMU TANAKA, HISASHI SHINOHARA1975 Volume 7 Issue 6 Pages 474-475
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSDownload PDF (305K) -
TATSUO TANAKA1975 Volume 7 Issue 6 Pages 475-477
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSDownload PDF (489K) -
EUI NAKANISHI, HIROAKI YASUOKA, EIICHI KUNUGITA1975 Volume 7 Issue 6 Pages 477-479
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSDownload PDF (499K) -
TOYOHIKO HAYAKAWA, MASAKUNI MATSUOKA1975 Volume 7 Issue 6 Pages 480
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
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MASARU ISHIDA, YOSHIO NAKANO, TAKASHI SHIRAI1975 Volume 7 Issue 6 Pages 481-482
Published: January 31, 1975
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSDownload PDF (385K)
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