JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Online ISSN : 1881-1299
Print ISSN : 0021-9592
Search
Advanced search
OR
Browse
Search
Volume 12, Issue 5
Displaying 1-14 of 14 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • A NEW CORRELATION FOR PRESSURE DROP OF PACKED COLUMN
    TERUO TAKAHASHI, YASUHARU AKAGI, KATSUKI UEYAMA
    1979 Volume 12 Issue 5 Pages 341-346
    Published: October 20, 1979
    Released on J-STAGE: April 03, 2006
    DOIhttps://doi.org/10.1252/jcej.12.341
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    By the use of the experimental data of many previous studies, a new correlation for the pressure drop of a packed column was obtained in this work. The total pressure drop is expressed as the sum of the dry pressure drop and the wet pressure drop. The dry pressure drop originates mainly from the friction of gas rising through the void of the packed bed, and is expressed by the Fanning equation. The wet pressure drop originates from the increase in net gas velocity because of the smaller void of the packed bed owing to the liquid holdup, and therefore it is expressed as a function of liquid holdup, gas velocity, etc. The liquid holdup consists of static and dynamic holdups, and is correlated separately.
    View full abstract
    Download PDF (386K)
  • PHYSICAL MECHANISM OF HEAT TRANSFER FROM HEATED AND COOLED CYLINDER TO WATER IN ULTRASONIC STANDING WAVE FIELD
    TERUHIKO HOSHINO, HIROSHI YUKAWA
    1979 Volume 12 Issue 5 Pages 347-352
    Published: October 20, 1979
    Released on J-STAGE: April 03, 2006
    DOIhttps://doi.org/10.1252/jcej.12.347
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    It is well known that the heat transfer rate from a solid surface to a fluid is increased in an ultrasonic field, but the mechanism of enhancement of heat transfer with ultrasonics has not been elucidated sufficiently. To clarify the mechanism of heat transfer with ultrasonic irradiation, the effects of an ultrasonic standing wave of 28KHz on the free convective heat transfer from a heated or a cooled cylinder of diameter 17.5 mm to degassed water were investigated experimentally. In particular, temperature distribution near the node and the antinode of the ultrasonic standing wave were observed by the Schlieren method. The average and the local heat transfer coefficients between the node and the antinode of the standing wave from the heated cylinder to water were measured.
    In the case of heat transfer from the heated cylinder, the heated water near the cylinder is moved from the node to the antinode of the standing wave, whereas the cooled water near the cooled cylinder is moved from the antinode to the node. Therefore, the thermal boundary layer thickness around the cylinder is varied by movement of fluid and as a result it is considered that the local and the average heat transfer coefficient vary. An acoustic radiation pressure theory which explains the mechanism of heat transfer in an ultrasonic stnading wave field is proposed.
    View full abstract
    Download PDF (517K)
  • EXTRACTION EQUILIBRIUM OF ZINC CHLORIDE WITH LONG-CHAIN ALKYLAMINE
    KATSUTOSHI INOUE, TETSUO TSUJI, ISSEI NAKAMORI
    1979 Volume 12 Issue 5 Pages 353-357
    Published: October 20, 1979
    Released on J-STAGE: April 03, 2006
    DOIhttps://doi.org/10.1252/jcej.12.353
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    As a basic study of solvent extraction of metals with high molecular-weight amines, the measurement of the distribution equilibrium of zinc chloride between Amberlite LA-2, long-chain secondary alkylamine (n-lauryl trialkylmethylamine), dissolved in n-hexane and an aqueous solution of hydrochloric acid was carried out at 30°C over wide concentration ranges of amine, zinc chloride and hydrochloric acid.
    It was clarified that zinc chloride is extracted by the following reaction:
    ZnCl2(aq.)+(BH Cl)2(org.)→←(BH)2ZnCl4(org.)
    The equilibrium constant for this reaction and the stability constants of the chloro complexes of zinc were determined.
    View full abstract
    Download PDF (411K)
  • EXTRACTION KINETICS OF ZINC CHLORIDE WITH LONG-CHAIN ALKYLAMINE
    KATSUTOSHI INOUE, TETSUO TSUJI, ISSEI NAKAMORI
    1979 Volume 12 Issue 5 Pages 357-362
    Published: October 20, 1979
    Released on J-STAGE: April 03, 2006
    DOIhttps://doi.org/10.1252/jcej.12.357
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The solvent extraction of zinc chloride from aqueous hydrochloric acid solution with Amberlite LA-2, a long-chain secondary alkylamine, dissolved in n-hexane was carried out at 30°C by the single drop method.
    The extraction rate mechanism was fairly well explained by the Handlos-Baron model, taking account of the interfacial reaction at the drop surface as a rate-determining step.
    Furthermore, it was found that the diffusion of zinc around a droplet is very rapid compared both to that inside a droplet and to the interfacial reaction under this experimental condition. Zinc in the continuous phase is extracted into the dispersed phase as a neutral species, ZnCl2.
    View full abstract
    Download PDF (437K)
  • EFFECTIVENESS FACTOR OF CATALYST PARTICLE INVOLVING BOTH INTRAPARTICLE AND INTERPHASE TRANSPORT
    METHANATION OF CARBON MONOXIDE
    NORIYOSHI MORITA, MAKOTO UI
    1979 Volume 12 Issue 5 Pages 363-368
    Published: October 20, 1979
    Released on J-STAGE: April 03, 2006
    DOIhttps://doi.org/10.1252/jcej.12.363
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    To establish an explicit method of estimating the effectiveness factor of a nonisothermal catalyst particle including intraparticle and interphase transport effects, the mass and heat transfer coefficients at gas-solid interphase are expressed as functions of temperature, composition, and mass velocity of the gas phase, taking the CO-H2-CH4-H2O system as a typical example. The system equations at steady state of the catalytic methanation of carbon monoxide with Langmuir-Hinshelwood kinetics are solved by the orthogonal collocation method. Effects of temperature, particle size, and the number of collocation points on the precision of the solution are studied in detail. The results are confirmed in comparison with those obtained by Weisz and Hicks'' method.
    View full abstract
    Download PDF (487K)
  • AN APPROXIMATE THEORY FOR DYNAMIC PRES-SURE OF SOLIDS ON MASS-FLOW BINS
    HIROSHI TAKAHASHI, HIROSHI YANAI, TATSUO TANAKA
    1979 Volume 12 Issue 5 Pages 369-375
    Published: October 20, 1979
    Released on J-STAGE: April 03, 2006
    DOIhttps://doi.org/10.1252/jcej.12.369
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The present paper deals firstly with the criterion concerning the hopper included angle which guarantees that solids behave in a mass-flow state in a bin, and secondly with an approximate theory for the dynamic pressures acting on mass-flow bins during emptying. Referring to the profile of failure planes observed within solids flowing in model hoppers, the critical hopper angle for mass flow was theoretically determined as a function of frictional angles. The dynamic pressures on bin walls and the concentrated pressure acting at the transition from a vertical section of a bin to a hopper of converging walls were predicted assuming that the stress patterns which exist within the bin are characteristic of mass flow conditions. The results obtained are compared with recent theoretical and experimental work.
    View full abstract
    Download PDF (735K)
  • AN APPROXIMATE THEORY FOR DYNAMIC PRES-SURE OF SOLIDS ON FUNNEL-FLOW BINS
    HIROSHI TAKAHASHI, HIROSHI YANAI, TATSUO TANAKA
    1979 Volume 12 Issue 5 Pages 376-382
    Published: October 20, 1979
    Released on J-STAGE: April 03, 2006
    DOIhttps://doi.org/10.1252/jcej.12.376
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A simple analysis is carried out to represent the stress pattern set up during emptying of a funnel-flow bin. In the first section of this analysis, so called "funnel flow" of solids in a bin is classified into four different types for characterizing the flow pattern and the stress pattern in the funnel-flow bin. An approximate theory for the dynamic wall pressure is then presented. The wall-pressure distribution is predicted from information on bin geometry and the frictional properties of the system alone. This analysis also reveals that under a particular condition a considerably high overpressure develops on the bin wall. A method for finding an optimum design condition is illustrated, with examples.
    View full abstract
    Download PDF (620K)
  • FRACTURE CHARACTERISTICS OF SINGLE PARTICLE OF POLYMERIC MATERIALS UNDER IMPACT LOADING
    SATOSHI OKUDA, Woo Sik CHOI
    1979 Volume 12 Issue 5 Pages 383-388
    Published: October 20, 1979
    Released on J-STAGE: April 03, 2006
    DOIhttps://doi.org/10.1252/jcej.12.383
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The subject of this paper is the fracture characteristics of single particles of polymethylmethacrylate (PMMA) or polystyrene (PS) when they were impacted on a target by using an air gun. As a result of experiments a new method of measuring the specific fracture-surface energy was also obtained.
    From the total energy balance of the impacted particle and the target, the specific fracture energy for PMMA and PS was calculated from four kinds of measured values, namely impact velocity, rebound velocity, deformation, and impact force of a collided particle. The specific fracture energy was formulated as a function of the impact velocity of a particle.
    The specific fracture-surface energy was also calculated from the values of the specific fracture energy and the increase of specific surface area. The values of the specific fracture-surface energy at the optimum impact velocity were estimated to be 1.5-2.0 kJ/m2 for PMMA and 3.0-3.4 kJ/m2 for PS.
    View full abstract
    Download PDF (563K)
  • GASIFICATION OF COAL CHAR IN A TWO-STAGE PRESSURIZED FLUIDIZED BED
    JUN-ICHI KAWABATA, MIDORI YUMIYAMA, YONESHIRO TAZAKI, SENJI HONMA, SHO ...
    1979 Volume 12 Issue 5 Pages 389-393
    Published: October 20, 1979
    Released on J-STAGE: April 03, 2006
    DOIhttps://doi.org/10.1252/jcej.12.389
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A two-stage pressurized fluidized bed coal char gasification process has been developed. This process is one of the activities conducted under the "Sunshine Project" to provide coal conversion technology.
    A partition disc was used to divide the fluidized bed into two stages, the first used as a combuster and the second as a gasifier. Coal char in the ash and sand bed was gasified by air and steam to produce low-heating value gases. Experimental data on carbon efficiency, exit gas composition, particle size distribution, etc. are reported in the present paper.
    View full abstract
    Download PDF (312K)
  • SEPARATION OF OILY WATER BY BUBBLE COLUMN
    TERUO TAKAHASHI, TOSHIRO MIYAHARA, YOSHINORI NISHIZAKI
    1979 Volume 12 Issue 5 Pages 394-399
    Published: October 20, 1979
    Released on J-STAGE: April 03, 2006
    DOIhttps://doi.org/10.1252/jcej.12.394
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Experiments for removing emulsified oil from oily water by use of a bubble column were carried out in oil-in-water emulsion of dilute suspension and minute oil particles. The hydrodynamic performance of bubble layer in a column is evaluated approximately by the results obtained by authors. The removal rate of emulsified oil from oily water is influenced by many factors, and the fastest removal rate is obtained when pH is about 4. The mechanism of the removal of emulsified oil follows the first-order kinetics proposed by Imaizumi et al. under the assumption that the rate constant has a distribution expressed as the gamma distribution function.
    View full abstract
    Download PDF (419K)
  • SOME SOLUTIONS OF A NONLINEAR DIFFUSION PROBLEM
    MUTSUMI SUZUKI
    1979 Volume 12 Issue 5 Pages 400-403
    Published: October 20, 1979
    Released on J-STAGE: April 03, 2006
    DOIhttps://doi.org/10.1252/jcej.12.400
    JOURNAL FREE ACCESS
    Download PDF (276K)
  • GAS-PARTICLE HEAT TRANSFER IN A PACKED FLUIDIZED BED
    KUNIO KATO, HIROYUKI ITO, SHINJI OMURA
    1979 Volume 12 Issue 5 Pages 403-405
    Published: October 20, 1979
    Released on J-STAGE: April 03, 2006
    DOIhttps://doi.org/10.1252/jcej.12.403
    JOURNAL FREE ACCESS
    Download PDF (192K)
  • MICROSTRUCTURE AND PERMEABILITY OF DRIED PRODUCT FOR FROZEN AQUEOUS SOLUTION
    HIDEO SHINAGAWA, YUJI KAWAMURA
    1979 Volume 12 Issue 5 Pages 406-408
    Published: October 20, 1979
    Released on J-STAGE: April 03, 2006
    DOIhttps://doi.org/10.1252/jcej.12.406
    JOURNAL FREE ACCESS
    Download PDF (296K)
  • RELATION BETWEEN INTENSITY OF SEGREGATION AND DEGREE OF SEGREGATION IN STIRRED TANK REACTOR
    MASAHARU TAKAO, OSAMU NOMOTO, YASUHIRO MURAKAMI, YUJI SATO
    1979 Volume 12 Issue 5 Pages 408-410
    Published: October 20, 1979
    Released on J-STAGE: April 03, 2006
    DOIhttps://doi.org/10.1252/jcej.12.408
    JOURNAL FREE ACCESS
    Download PDF (196K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top