Journal issue
Volume 15 (1982)
- Issue 6 Pages 421-
- Issue 5 Pages 335-
- Issue 4 Pages 249-
- Issue 3 Pages 167-
- Issue 2 Pages 85-
- Issue 1 Pages 1-
Volume 15
, Issue 5
Showing 1-15 articles out of 15 articles from the selected issue
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KOJIRO OGIWARA, YASUHIKO ARAI, SHOZABURO SAITO1982 Volume 15 Issue 5 Pages 335-342
Published: October 20, 1982
Released: April 04, 2006
JOURNALS FREE ACCESSThe thermal conductivities of ten pure liquid alcohols and four of their binary mixtures were measured by use of the relative horizontal parallel-plate method (steady-state type) under atmospheric pressures Measurements for pure alcohols were carried out at temperatures from 20 to 70°C and for binary mixtures at 25.0 and 50.0°C.
A previous correlation model developed for the thermal conductivities of nonpolar liquids on the basis of the lattice model coupled with the hole theory concept has been successfully extended to polar liquids such as alcohols by the introduction of a new empirical parameter to represent the polar effect. Reduced values of the potential parameters and the empirical parameter, needed in the calculation of thermal conductivities, could be correlated by quadratic functions of Pitzer''s acentric factor and Stiel''s polar factor. The present model is also extended to alcohol mixtures by use of binary interaction parameters.View full abstractDownload PDF (606K) -
TOSHIRO MARUYAMA, YUJI BAN, TOKURO MIZUSHINA1982 Volume 15 Issue 5 Pages 342-348
Published: October 20, 1982
Released: April 04, 2006
JOURNALS FREE ACCESSAn experimental investigation was made of the mixing of liquids in a tank where the liquid jet was injected through a nozzle. The mixing time was defined as the time required to reduce the concentration variation within 1% of the mixed mean value and was measured by an impulse response. The circulation time was also obtained from the response curve.
It was found that in the circulation flow regime of mixing (Re>3 ×104) there exists an optimum nozzle depth for rapid mixing. It ranges from the liquid surface level to three-quarters of the liquid depth when the liquid depth is equal to the tank diameter, and is the mid-depth of the liquid when the liquid depth is smaller than the tank diameter. When the nozzle height is within one-fourth of the tank diameter, it is efficient for rapid mixing to tilt the nozzle upwards enough to prevent the formation of a wall jet, which induces circulations of small variance of circulation time.View full abstractDownload PDF (551K) -
TORU TAKAMATSU, MANABU YAMAGUCHI, TAKASHI KATAYAMA1982 Volume 15 Issue 5 Pages 349-355
Published: October 20, 1982
Released: April 04, 2006
JOURNALS FREE ACCESSVolumes and charges of water drops formed in a uniform electric field (0-4 kV/cm) have been measured in cyclohexane, toluene, insulating oil and three kinds of silicone oils as continuous phase. Effects of nozzle length extended from an electrode, flow rate of dispersed phase and liquid viscosity of continuous phase on the volume and the charge are examined. Experimental values are compared with those calculated by equations presented.
It is clarified that experimental volumes of the drops formed in a liquid having viscosity up to ten centipoises can be predicted by the presented equation. The experimental drop charges at low flow rates of dispersed phase are also represented by the equation. In a range of high flow rates of dispersed phase, however, a sudden decrease of charge has been observed.View full abstractDownload PDF (563K) -
KUNIO KATO, ETSUO WATANABE, TAKASHI OGURA, TAMOTSU HANZAWA1982 Volume 15 Issue 5 Pages 355-361
Published: October 20, 1982
Released: April 04, 2006
JOURNALS FREE ACCESSThe temperature distribution was measured in a horizontal circular tube with a high uniform wall temperature in the case where gas flowed through the tube in the laminar flow range. The temperature in the upper portion of the cross section was higher than that in the lower portion. The isothermal lines estimated from the measured temperature distribution in the cross section were symmetrical to the vertical centerline of the cross section.
The heat transfer coefficient from the tube wall is affected by tube diameter, distance from tube inlet, wall temperature and Reynolds number. The empirical equation for the heat transfer coefficient from the tube wall is obtained.
To analyze the heat transfer in the tube the fundamental equations are derived under suitable assumptions based upon observation of the flow pattern in the tube and are solved numerically. The calculated temperature distribution and the calculated heat transfer coefficient from the tube wall agree approximately with the experimental findings.View full abstractDownload PDF (480K) -
MUTSUO AOKI, HIROYUKI TANAKA, HIROSHI KOMIYAMA, HAKUAI INOUE1982 Volume 15 Issue 5 Pages 362-367
Published: October 20, 1982
Released: April 04, 2006
JOURNALS FREE ACCESSSimultaneous absorption of NO2 and NO into alkaline solutions was studied in a wide range of gaseous concentrations, NO2 from 5 to 2000 ppm and NO from 0.066 to 1.2%. The absorption rate was not dependent on the concentration of hydroxide ion in the solution, if the alkalinity in the vicinity of the interface was maintained. In the presence of NO in excess of NO2, the stoichiometry of the absorption is expressed by the reaction NO+NO2+2OH-→2NO2-+H2O and the rate is proportional to the product of the interfacial concentrations of NO2 and NO. The predominant mechanism is considered to be the solution of N2O3 in equilibrium with NO and NO2 at the interface followed by its rapid hydration. The absorption rate is expressed by H√k2D [N2O3]G, H√k2D being 2.55 m•s-1, which is about two orders of magnitude greater than the corresponding value for the absorption of N2O4.View full abstractDownload PDF (467K) -
KEN-ICHI OKAMOTO, FUMIAKI HONDO, AKIRA ITAYA, SHIGEKAZU KUSABAYASHI1982 Volume 15 Issue 5 Pages 368-375
Published: October 20, 1982
Released: April 04, 2006
JOURNALS FREE ACCESSThe dye-sensitized photodegradation of aqueous phenol using rose bengal was carried out batchwise in the chemical region by using an annular bubble-column photoreactor, to evaluate the use of sunlight in wastewater treatment. Effects of both the partial pressure of oxygen and the initial concentration of phenol, [A]0, on the initial reaction rate were analyzed according to the reaction scheme including the quenching reaction of triplet dye 3D* with phenol, in order to determine the kinetic parameters. The reaction rate constant of phenol with singlet oxygen increased with increasing pH and was 2.66 ×108 dm3/mol-s at pH 10.3. The reaction quantum yield at pH 10.3 was limited to a maximum of 0.29 at [A]0=3 ×10-3 mol/dm3 for O2-bubbling and 0.13 at [A]0=1.4 ×10-3 mol/dm3 for air-bubbling by the quenching reaction of 3D* with phenol, of which the rate constant was 4.0×108 dm3/mol• s. p-Benzoquinone, the primary main product, underwent further degradation with both alkaline and ground-state oxygen to yield final products such as carboxylic acids. The reaction curves were simulated closely up to high conversions by taking account of the quenching effect of both phenol and the quinone-type intermediate products on 3D*.View full abstractDownload PDF (630K) -
YASUO KATO, AKIO NISHIWAKI, SHIGENOBU TANAKA, TAKASHI FUKUDA1982 Volume 15 Issue 5 Pages 376-382
Published: October 20, 1982
Released: April 04, 2006
JOURNALS FREE ACCESSThe longitudinal concentration distribution of solid particles in 0.122- and 0.214-m i.d. multistage bubble columns was measured and analyzed by using a sedimentation-diffusion model with back-flow and the previously proposed empirical equations for single-stage bubble columns containing suspended solid particles and multi-stage bubble columns.
The mean settling velocity of solid particles through the partition plates was correlated with dimensionless groups. The values of concentration of solid particles in multi-stage bubble columns calculated from the proposed correlation and the previously proposed ones agreed with the observed values within ±30%.View full abstractDownload PDF (525K) -
CORRELATION OF VELOCITY DISTRIBUTIONS IN AN ANCHOR-AGITATED VESSEL USING A BICUBIC B-SPLINE FUNCTIONKUNIO ARAI, KOJI TAKAHASHI, SHOZABURO SAITO1982 Volume 15 Issue 5 Pages 383-389
Published: October 20, 1982
Released: April 04, 2006
JOURNALS FREE ACCESSA surface-fitting method has been developed for the velocity data scattered on a given surface by using a bicubic B-spline function and is applied to data obtained from the analysis of the path lines of tracer particles in an anchor-agitated vessel.
This method has been proved to be of great use for expression of the velocity distributions throughout an agitated vessel if sufficient data for path lines are available.View full abstractDownload PDF (564K) -
MASARU ISHIDA, HITOSHI TANAKA1982 Volume 15 Issue 5 Pages 389-391
Published: October 20, 1982
Released: April 04, 2006
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TOSHIRO MIYAHARA, YORISHIGE MATSUBA, SATORU KASENO, TERUO TAKAHASHI1982 Volume 15 Issue 5 Pages 391-393
Published: October 20, 1982
Released: April 04, 2006
JOURNALS FREE ACCESSDownload PDF (214K) -
NAOHIRO SHIRAGAMI, ICHIRO INOUE1982 Volume 15 Issue 5 Pages 394-396
Published: October 20, 1982
Released: April 04, 2006
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KATSUYUKI NAKANO, YOSHIHIDE FUEDA, TERUMI UCHINO, KOICHIRO KUSUNOKI1982 Volume 15 Issue 5 Pages 397-399
Published: October 20, 1982
Released: April 04, 2006
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SHINJI OGAWA, YOKO SHIMIZU, SETSUJI TONE, TSUTAO OTAKE1982 Volume 15 Issue 5 Pages 400-402
Published: October 20, 1982
Released: April 04, 2006
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YOSHITERU KANDA, MASAHIRO HASEGAWA, TORAJIRO HONMA1982 Volume 15 Issue 5 Pages 402-404
Published: October 20, 1982
Released: April 04, 2006
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HITOSHI TAKASE, HAJIME UNNO, TAKASHI AKEHATA1982 Volume 15 Issue 5 Pages 405-408
Published: October 20, 1982
Released: April 04, 2006
JOURNALS FREE ACCESSDownload PDF (352K)
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