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Volume 35 (1981 - 198･･･
- Issue 6 Pages 317-
- Issue 5 Pages 255-
- Issue 4 Pages 183-
- Issue 3 Pages 123-
- Issue 2 Pages 58-
- Issue 1 Pages 3-
Volume 35, Issue 6
Displaying 1-6 of 6 articles from this issue
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Kazuhiko SUGASAKA, Shunsaku KATOH1982 Volume 35 Issue 6 Pages 317-325
Published: 1982
Released on J-STAGE: February 19, 2013
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Totaro GOTO, Yoshihiro NAKASHIMA1982 Volume 35 Issue 6 Pages 326-338
Published: 1982
Released on J-STAGE: February 19, 2013
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Hirofumi MIYOSHI, Tsugio FUKUMOTO1982 Volume 35 Issue 6 Pages 339-343
Published: 1982
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSA spacer is usually mounted in an ion exchange compartment of an electrodialytic equipment. When a very thin spacer commercially available is used, the thickness of the spacer is thinner than that of the gasket of the ion exchange compartment, and some space arises on both sides of the spacer.
The equations on the distributions of the flow velocity inside and outside the spacer in the above case were derived from the modification of the Brickman's equation.
To study the validity of these equations, the velocity distributions outside the spacer under a variety of spacers and flow rates were measured by the tracer-photographic method. The velocity distributions obtained experimentally were in fair agreement with the theoretical results obtained by the equations. The pressure drop and flow rates in the compartment in the presence of some space on both sides of spacer were also measured experimentally by altering the thickness of the gasket of the ion exchange compartment and the thickness of the spacer. The permeability calculatedby substituting these values in the theoretical equation in the case where some space was present on both sides of spacer was in good agreement with the one obtained when the ion exchangecompartment was filled with spacers. These results proved that the velocity distributionsin the ion exchange compartment were represented by the theoretical equation derived in the presentpaper. Further, the equation for estimating the dimensionless parameter in these velocity distributions was also obtained.View full abstractDownload PDF (3104K) -
Kyunosuke MAJIMA, Kazuko KATSUKI, Shumpei OKA1982 Volume 35 Issue 6 Pages 344-348
Published: 1982
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSIn the previous paper [this journal, 34, 263 (1980)], the authors reported the results of the study that they carried out on the determination of the isotherms of the ternary system NaCl-CaCl2-H2O, KCl-CaCl2-H2O and the quaternary system NaCl-KCl-CaCl2-H2O at 110°C.
In this paper, the isotherms of the ternary system NaCl-MgCl2-H2O and the quaternary system NaCl-MgCl2-CaCl2-H2O at 110°C were studied.
The results of this study were as follows: 1) The isotherms and invariant points of the ternary system NaCl-MgCl2-H2O and the quaternary system NaCl-MgCl2-CaCl2-H2O were determined at 110°C.2) The systems NaCl-MgCl2-H2O and NaCl-MgCl2-CaCl2-H2O at the temperature ranging from 75 to 110°C were characterized by the increased solubility of sodium chloride.View full abstractDownload PDF (2915K) -
Kyoichi SAITO, Terukatsu MIYAUCHI1982 Volume 35 Issue 6 Pages 349-354
Published: 1982
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThe diffusivity of each constituent was analyzed from the relationship between the total molar flux and the total concentration gradient in artificial sea-water containing uranium.The effect of the electroneutrality on the diffusivity was examined. It was found that the Coulomb force had little effect on the diffusivities of the minor constituents as compared with the major constituents, Na, Mg, Cl and SO4.View full abstractDownload PDF (3109K) -
Kenkichi IZUMI, Akira YAMADA1982 Volume 35 Issue 6 Pages 355-360
Published: 1982
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThe thermal conductivity and density of the alkaline scale formed on the surface of the heat transfer tubes in the distillation-type desalination plant were experimentally examined. The alkaline scale was the mixture of two kinds of salt, calcium carbonates and magnesium hydroxide, and the composition of the scale was affected by its precipitation temperature in the solution.
By the experimental measurements, the densities of the mixtures of two salts were lower than the ones of each single salt. This was thought to mean that the alkaline scale was composed of the porous substances. Therefore, the model of scale structure was assumed as the mixture of the small particles of two salts. The porosity of the scale reached to 40% at the relative proportion of two salts, X=0.55, that corresponded to the porosity for the roughest packing condition of theuniform spheres.
The overall heat transfer coefficients for the test tubes were measured by using a double-tubetype heat exchanger. From the difference of the overall heat transfer coefficients for the tube with and without the scale, the thermal resistance of the scale was calculated. And the thermal conductivities of two salts were experimentally obtained. The thermal resistance of the model scale was given by connecting the resistances of two salts and vacant spaces in series. And the value, 0.63W/m·K, was obtained as the thermal conductivity of the vacant spaces. This value was in good agreement with the one of the water that filled up the vacant spaces in the scale, and thus indicated the appropriateness of the model for the scale structure.View full abstractDownload PDF (4135K)
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