Journal issue
Volume 8 (1975)
- Issue 6 Pages 435-
- Issue 5 Pages 347-
- Issue 4 Pages 261-
- Issue 3 Pages 175-
- Issue 2 Pages 89-
- Issue 1 Pages 1-
Volume 8
, Issue 5
Showing 1-21 articles out of 21 articles from the selected issue
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J. SIMONS, A. B. PONTER1975 Volume 8 Issue 5 Pages 347-350
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSDiffusion coefficients of carbon dioxide in aqueous ethanol solutions have been determined at 25°C and at atmospheric pressure, using a short wetted-wall column.
The diffusional behaviour is compared with both that predicted by equations containing a relationship between diffusivity and liquid viscosity and equations correlating diffusivities to the values for the pure components of a binary liquid.
The diffusional behaviour at low ethanol concentrations is compared with other physical changes occurring at these conditions such as the wetting properties, partial molal volumes, sound velocity etc., to provide some insight into the combined effect of relative molecular size and hydrogen bonding on the diffusional mechanism.View full abstractDownload PDF (736K) -
MAKOTO HARADA, MASATAKA TANIGAKI, YUICHI TOYOTA, WATARU EGUCHI1975 Volume 8 Issue 5 Pages 350-356
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSThe relaxation model previously proposed by the authors was applied to the self-diffusion process in liquid metals. A Lennard-Jones type pair potential function was used to evaluate the term related to the frequency of the oscillatory motion in liquids. The self-diffusivity of liquid metals can be calculated simply from the melting temperature, Tm, and the liquid density, ρ, with the use of the final formulae:
D=0.135z(kT)1/2m-1/6ρ0-1/3(T/Tm)1/2(1-ρ/ρ0)=0.555(kT)1/2m-1/6/ρm-1/3(T/Tm)1/2(1-ρ/1.068ρm)
The agreement of calculated values with observed ones is satisfactory, especially for temperature dependency. The physical meaning of the model parameters, z and ρo is also discussed.View full abstractDownload PDF (1305K) -
HIDEO NISHIUMI, SHOZABURO SAITO1975 Volume 8 Issue 5 Pages 356-360
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSA new equation of state applicable to lower reduced temperatures than the BWR equation of Starling and Han (BWRS equation) is proposed, adding four coefficients to their equation of eleven coefficients. Thermodynamic properties predicted by the two equations, such as density, enthalpy, isobaric heat capacity, f ngacity coefficient, vapor pressure, and vapor-liquid equilibrium, are compared to test the validity of the new equation of state. The ranges in which thermodynamic properties can be predicted, within about 10 % error, are extended down to 0.35 or below at reduced temperatures with the new equation. The limit for the prediction of saturated fugacity and vapor pressure for a pure substance, for instance, can be lowered from 0.47 with the BWRS equation to 0.32 with the new equation of state.View full abstractDownload PDF (856K) -
MANABU YAMAGUCHI, TAKASHI FUJIMOTO, TAKASHI KATAYAMA1975 Volume 8 Issue 5 Pages 361-366
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSMass transfer rate in the dispersed phase was measured on single drops falling or rising with oscillation of oblate-prolate type through stationary liquid fields. The two-liquid systems used were water and aqueous glycerine solution drops in benzene and in carbon tetrachloride, and water drops in toluene. The iodine was used as the solute which transferred from the drops to the organic solvents.
The moving behavior of the oscillating water drops during mass transfer was investigated in regard to frequencies, amplitudes and terminal velocities of the drops by use of a high-speed cine camera.
Experimental dispersed-phase Sherwood number is correlated with the dispersed-phase Schmidt number and the modified Reynolds number which is defined by use of diameter, frequency and kinetic viscosity of the dispersed phase. The extraction efficiency obtained is also compared with the model of Angelo et al., and it is found that the experimental results were explained satisfactorily by use of their model.
An empirical equation for the critical drop diameter of the oscillation onset is also obtained.View full abstractDownload PDF (1205K) -
KENJI HASHIMOTO, KOUICHI MIURA, SHINJI NAGATA1975 Volume 8 Issue 5 Pages 367-373
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSDiagrams showing concentration change in an agitated tank adsorber are presented to estimate intraparticle diffusivities under nonlinear isotherms, where either pore or surface diffusion is assumed to be controlling. The adsorption kinetics of DBS and phenol from dilute aqueous solutions onto two kinds of activated carbon are measured, and the intraparticle diffusivities are estimated with diagrams. An approximation method for the case where surface diffusion is controlling, which is a modification of the Dryden and Kay method, is also proposed. This method gives good agreement with the diagrams obtained numerically.View full abstractDownload PDF (1250K) -
YOSHIO NAKANO, MASARU ISHIDA, TAKASHI AKEHATA, TAKASHI SHIRAI1975 Volume 8 Issue 5 Pages 374-378
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSα-Hematite powder of 8.1 μm in average diameter was packed in a quartz tube and was reduced by feeding pure hydrogen toward the upper surface of the packed bed at 900°C and the pressure increase within the bed was measured. Midway through the reduction, hydrogen-inert gas mixtures were fed instead of pure hydrogen and the variation of the pressure increase ΔP within the bed with increasing mole fraction of inert gas in feed gas, xI, 0, was investigated. Nitrogen, argon, and helium were used as the inert gas and it was found that the relationship between ΔP and xI, a varied with each inert gas.
To interpret those phenomena, the concept of the multicomponent dynamic effective diffusivity is proposed. It will make the nonisobaric analysis of solid-multicomponent gas reactions possible.View full abstractDownload PDF (902K) -
MOTOYUKI SUZUKI, KUNITARO KAWAZOE1975 Volume 8 Issue 5 Pages 379-382
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSAdsorption of fifteen kinds of volatile organics on activated carbon from aqueous solution was carried out in a batch system. It was assumed that the rate of adsorption was controlled by intraparticle surface diffusion, and the effective surface diffusion coefficient for each organic was determined by applying the concentration-time diagrams appropriated for Freundlich isotherms. The effective surface diffusion coefficients, Dε, thus obtained, are successfully correlated to the ratio of the boiling point of adsorbate to adsorption temperature as
Dε=1.1×10-4exp(-5.32Tb/T) [cm2/sec]View full abstractDownload PDF (640K) -
LAMBERT OTTEN, G. ALAN TURNER1975 Volume 8 Issue 5 Pages 383-387
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSThe process involved in the transference of heat or matter between phases may embrace convective, diffusive, or conductive transport. The experimental determination of values of such transfer and diffusion coefficients, or of thermal conductivity, is often conveniently done by means of frequency response. This involves a knowledge of the relation between the flux between phases and the concentration (of heat or matter) in one of them. This relation between complex vectors has been called the shunt admittance by analogy with other systems. Specification of this admittance requires that the geometry and structure of the system be defined.
One important system comprises a fluid phase flowing adjacent to a stationary system. The latter may be continuous, or a collection of discrete solids. The estimation of parameters requires two things: the experimental measurement of the cyclic perturbation in the flowing phase and the above mentioned shunt admittance of the stationary phase.
Equations are presented giving the shunt admittance of a homogeneous spherical shell with radial symmetry. This is of interest because it occurs in a number of processes; e.g., in a "shrinking core" chemical or metallurgical reaction, or a faulty sintered sphere.
Numerical values of the admittance are plotted with dimensionless coordinates and parameters.
A discussion is presented of the extension of the method to microscopically inhomogeneous shells of porous solids.View full abstractDownload PDF (811K) -
TSUTAO OTAKE, SETSUJI TONE, MASAO KAWASHIMA, TOSHIO SHIBATA1975 Volume 8 Issue 5 Pages 388-392
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSBubble size and the rise velocity of bubbles in fluidized beds at high temperature were measured by the electric capacitance method using an injection tube and a sintered-plate distributor. The bubble frequency increased with rise in temperature and the bubble size was rearranged as a function of bubble frequency and gas flow rate. The rise velocity of bubbles in swarms was divided into two terms, i.e., the rise velocity of isolated bubbles and the accelerated quantity due to bubble coalescence. The latter was correlated as a function of the ratio of distance between two successive bubbles to bubble radius. A model of bubble shape was proposed and effectively used to estimate the empirical coefficients included in the correlation for bubble size and rise velocity of bubbles.View full abstractDownload PDF (903K) -
TOKURO MIZUSHINA, HIROMOTO USUI1975 Volume 8 Issue 5 Pages 393-398
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSThe dynamic equation with the generalized Maxwell model is solved numerically in moderate Reynolds number range. The results of calculation reveal the effect of elasticity in cross flow around a circular cylinder. The electrochemical method is used for the measurement of Sherwood number in cross flow of dilute polymer solutions. Comparison of calculated values with the experimental results shows good agreement.View full abstractDownload PDF (987K) -
ISAMU NAGATA, SHUHEI YASUDA1975 Volume 8 Issue 5 Pages 398-400
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSDownload PDF (473K) -
S. RAMACHANDRAN, A. BARADARAJAN, M. SATYANARAYANA1975 Volume 8 Issue 5 Pages 400-402
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSDownload PDF (469K) -
ATSUSHI IKARI, KIMIKO MURATA, SHIGERU MATSUSHITA1975 Volume 8 Issue 5 Pages 402-403
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSDownload PDF (279K) -
TAKESHI TSUBOKA, TAKASHI KATAYAMA1975 Volume 8 Issue 5 Pages 404-406
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSDownload PDF (488K) -
ISAMU NAGATA, MASATAKA NAGASHIMA, MICHIO OGURA1975 Volume 8 Issue 5 Pages 406-408
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSDownload PDF (478K) -
E. RIOLO, X. B. REED, S. HARTLAND1975 Volume 8 Issue 5 Pages 409-411
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSDownload PDF (488K) -
HARUO HIKITA, HIROSHI KIKUKAWA1975 Volume 8 Issue 5 Pages 412-413
Published: October 31, 1975
Released: March 28, 2006
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S. N. UPADHYAY, B. K. D. AGRAWAL, D. R. SINGH1975 Volume 8 Issue 5 Pages 413-415
Published: October 31, 1975
Released: March 28, 2006
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MANABU YAMAGUCHI, SUMIO WATANABE, TAKASHI KATAYAMA1975 Volume 8 Issue 5 Pages 415-417
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSDownload PDF (530K) -
KUNIO YOSHIDA, DAIZO KUNII, FUJIO SHIMIZU1975 Volume 8 Issue 5 Pages 417-419
Published: October 31, 1975
Released: March 28, 2006
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ON THE EXTENSION OF THE SUCCESSIVE CONTACT MODEL TO FIRST ORDER REVERSIBLE AND CONSECUTIVE REACTIONSMASAO YAMAZAKI1975 Volume 8 Issue 5 Pages 420-422
Published: October 31, 1975
Released: March 28, 2006
JOURNALS FREE ACCESSDownload PDF (381K)
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