All issues
Volume 13 (1980)
- Issue 6 Pages 433-
- Issue 5 Pages 343-
- Issue 4 Pages 257-
- Issue 3 Pages 173-
- Issue 2 Pages 87-
- Issue 1 Pages 1-
Volume 13, Issue 3
Displaying 1-18 of 18 articles from this issue
- |<
- <
- 1
- >
- >|
-
HAJIME UNNO, TAKASHI AKEHATA1980 Volume 13 Issue 3 Pages 173-177
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSA method of correlating data in terms of non-dimensional variable groups is discussed. The method is based on Group Method of Data Handling (GMDH). An algorithm for the method is developed and an example of the algorithm''s application is discussed. The algorithm developed is convenient for correlating experimental data of complicated systems. It should be stressed that the application of the method necessitates many kind of heuristics through which the method shows the versatility in the application.View full abstractDownload PDF (402K) -
HIDEO NISHIUMI1980 Volume 13 Issue 3 Pages 178-183
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSAn equation of state, applicable to polar substances over vapor and liquid regions, can be obtained by the addition of three polar parameters to the generalized BWR equation of state previously proposed for non-polar or slightly polar substances. The polar parameters are determined for 39 polar substances from vapor pressures and the second virial coefficients, and for 53 polar substances from vapor pressures and their dipole moments. The new equation of state is found to be valid for prediction of various thermodynamic properties, such as vapor pressures, the second virial coefficients, saturated liquid and vapor densities, vaporization entropies, enthalpies, and PVT properties, over wide vapor and liquid regions except near the critical point, i. e., the 1 017 Tr < 1.3 and 1<Pr<3 region.View full abstractDownload PDF (437K) -
KOHEI OGAWA, SHIRO ITO, CHIAKI KURODA1980 Volume 13 Issue 3 Pages 183-188
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSA method to predict the time-smoothed velocity profiles in the laminar-turbulent transitional region for incompressible fluid flows in smooth concentric annuli and pipes and between parallel plates is presented.
Under the assumption that the apparent viscosity is affected only by the surrounding solid wall and is expressed as a function of the n-th power of the distance between wall and noticed point and the apparent wall length, the velocity profiles are calculated numerically for various values of exponent, n, and are expressed in values relative to the cross-sectional average velocity. For each conduit flow, the relationships between exponent, n, and Reynolds number, Re, are determined by comparing the numerically calculated profiles with the experimental results.
By making use of these relationships between Re and n, the relative distribution of apparent viscosity and the relative time-smoothed velocity profile for an arbitrary Reynolds number can be predicted.View full abstractDownload PDF (471K) -
KOICHI FUJIE, MASAMI TAKAINE, HIROSHI KUBOTA, YUSHO MIYAJI1980 Volume 13 Issue 3 Pages 188-193
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSThe flow scheme and oxygen transfer were quantitatively investigated for the gas-liquid downflow system. Experiments were carried out on a pilot-scale column, 45 cm in inner diameter and 6 m high. The slip velocity of gas bubble swarm against liquid phase was correlated with gas holdup and bubble diameter, and thus conditions giving stable downward flow of completely segregated gas bubbles were specified.
The fraction of oxygen absorbed into liquid phase was observed under stable bubble flow conditions. Much higher volumetric oxygen transfer coefficients in the present system than those in the conventional upflow system were obtained. This was attributed to the high values of gas holdup, even up to 20%, in the present system. It is suggested that the present system could be applied as a promising aeration device utilizing enriched oxygen gas.View full abstractDownload PDF (541K) -
MASANOBU MAEDA, KOHICHIRO OHMORI1980 Volume 13 Issue 3 Pages 194-198
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSThe local heat transfer coefficients of a V-shape inverse wedge were experimentally investigated for an impinging jet, as a model of a system heating a polyethylene laminated paper with hot air jet and cooling to make it adhere by a cold roller. A clear peak of heat transfer coefficient was found at a position downwards along the wall for small wedge angle (θ<90°), and the peak position shifted downwards for smaller angles. The peak values of heat transfer coefficients were of the same order of magnitude for the angles and for a given distance of nozzle. The investigated peak values of heat transfer coefficients amounted to about 75 % of those in the stagnant region.View full abstractDownload PDF (361K) -
KATSUTOSHI INOUE1980 Volume 13 Issue 3 Pages 198-204
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSTheoretical analysis of mass transfer accompanied by heterogeneous reaction at the drop surface during drop formation was made for several kinds of reactions.
To interpret the relation between the extent of extraction during drop formation and operational variables such as drop formation time, the concentration of the reactant in both phases and the interfacial reaction rate constant, influences of the interfacial reaction on the overall mass transfer rate were investigated and were expressed by the relation between the reaction factor and the Damköhler number. The reaction factor for the instantaneous mass flux based on penetration theory was approximately expressed by that based on film theory.
It became clear that the extent of extraction is proportional to the drop formation time for a slow interfacial reaction rate but is proportional to the square root of the drop formation time for an instantaneous reaction.View full abstractDownload PDF (563K) -
ISAO KOMASAWA, TSUTAO OTAKE, TOSHIKAZU MURAOKA1980 Volume 13 Issue 3 Pages 204-208
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSThe kinetics of the extraction of copper from sulphate media with a hydroxyoxime chelating extractant was studied using a single-drop technique. A simple kinetic scheme involving the species adsorbed at the aqueous-organic interface was proposed. Assuming the extreme conditions of chemical reaction control to apply, the extraction rates were found to be directly proportional to both copper (II) ion and monomeric oxime concentrations and inversely proportional to hydrogen ion concentration. These results support the reaction scheme proposed.
The ratio of the rate constant for the n-heptane diluent system to that for the toluene diluent system was found to be as large as 20. This effect is thought to occur owing to the interfacial population density of adsorbed species and the free monomeric oxime content in the organic phase.View full abstractDownload PDF (443K) -
ISAO KOMASAWA, TSUTAO OTAKE, AKIRA YAMADA1980 Volume 13 Issue 3 Pages 209-213
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSThe extraction of copper from sulphate media with a hydroxyoxime chelating extractant was carried out using a stirred transfer cell. Simple physical extraction studies of iodine or acetic acid were also carried out. From a comparison of the results, the extraction mechanism for copper was found to be expressed simply by a series of diffusional processes into the interface for the reactive species and the succeeding interfacial reaction, at least at the initial stages of extraction.View full abstractDownload PDF (402K) -
KUNIO KATO, KENJI MATSUURA, YOSHINORI SAWAMURA, HIROYUKI MORI, TAMOTSU ...1980 Volume 13 Issue 3 Pages 214-219
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSSpent activated carbon loaded with methylene blue or phenol was regenerated in a nitrogen atmosphere and a steam-nitrogen atmosphere at a constant regeneration temperature. The relation between weight loss of the regenerated carbon and its adsorption capacity was investigated. Adsorption capacity was estimated by Iodine number and the decolorizing capacity of methylene blue.
In the regeneration of spent carbon in a nitrogen atmosphere, the residual material was more or less deposited on the carbon surface and the adsorption capacity of the regenerated carbon decreased.
In the regeneration of spent carbon in a steam-nitrogen atmosphere, the weight of spent activated carbon decreased with regeneration time. The weight loss rate of spent carbon was affected by the partial pressure of steam in the gas and the regeneration temperature. An empirical equation for the weight loss rate was obtained. A good correlation between Iodine number of the regenerated carbon and its weight loss was obtained.View full abstractDownload PDF (477K) -
SATOSHI OKUDA, Woo SIK CHOI1980 Volume 13 Issue 3 Pages 219-225
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSThis paper deals with the grinding characteristics of a target type fluid-energy mill, in which flying particles are ground by repeated impact on a target. The increase of specific surface area ΔSw and the distribution of particle size were investigated with respect to the following parameters: the target distance from nozzle outlet to target surface L, the target angle between air flow axis and target surface, the mixing ratio m of particles to air by weight, and the initial air pressure.
It was found that there were optimum L and m values for grinding, estimated to be 70±10 mm for L and 0.7-1.0 for m over almost all the experimental range. The energy efficiency ΔSw/Ef, defined as ΔSw per energy Ef in adiabatic expansion of air, was proportional to 1.0-1.2 power of m to m=0.7.
On the other hand, the input energy per unit products was inversely proportional to the particle size of products in the region of fine particle size, while it was independent of the particle size of products in the region of large particle size.View full abstractDownload PDF (597K) -
IKUO TAMORI, NOBUYUKI KOGURE, KAZUNARI IMAGAMI1980 Volume 13 Issue 3 Pages 225-230
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSA new balance-type isokinetic sampler for measuring stack dust has been developed, incorporating a thimble filter with the nozzle. The nozzle diameter is enlarged at the tapping for the inside static pressure. Since the pressure loss in front of the nozzle is compensated by measuring the inside static pressure at the point where the velocity decreases, measurements can be carried out isokinetically without the need for any other compensation. The theoretical basis for the design of the nozzle is described and is compared with experimental data.
This method provides a way for automatic sampling based on gravimetric measurement of the stack dust.View full abstractDownload PDF (477K) -
ISAO ENDO, TERUYUKI NAGAMUNE, ICHIRO INOUE1980 Volume 13 Issue 3 Pages 231-236
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSThe aim of this paper is to describe simple optimization problems of aerobic batch ethanol fermentation by yeast organisms (Saccharomyces cerevisiae) and to give a planning map for ethanol production.
The initial concentrations of glucose and of cell mass were considered to be decision variables, yield of ethanol for glucose and amount of ethanol produced were assumed to be the performance criteria of importance. The parameters, related to the physiological properties of the cells, which are necessary to optimize the performance criteria were elucidated. Calculations and experiments showed that one optimum performance point occurs when ethanol yield for glucose reaches its maximum value of 46% and amount of ethanol produced is 92 mg/ml; this occurred under the condition where the initial concentration of cell mass was 1.9 mg/ml and that of glucose was 200 mg/ml. Another optimum performance point was obtained with initial concentrations of cell mass and of glucose 2.0 mg/ml and 140 mg/ml, respectively, which gave a minimum fermentation time of 11 hours and a maximum ethanol yield of 46%.View full abstractDownload PDF (439K) -
KATSUTOSHI INOUE, YOSHIMASA OGAWA1980 Volume 13 Issue 3 Pages 237-239
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSDownload PDF (228K) -
KAZUO KONDO, TERUO TSUNEYUKI, FUMIYUKI NAKASHIO1980 Volume 13 Issue 3 Pages 240-242
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSDownload PDF (251K) -
S. C. GUPTA1980 Volume 13 Issue 3 Pages 242-246
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSDownload PDF (407K) -
KAZUO TAKEUCHI, OSAMU KURIHARA, RYOHEI NAKANE1980 Volume 13 Issue 3 Pages 246-248
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSDownload PDF (245K) -
KAZUYUKI CHIHARA, J. M. SMITH, MOTOYUKI SUZUKI1980 Volume 13 Issue 3 Pages 249-250
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSDownload PDF (140K) -
HIROSHI OAKI, MASARU ISHIDA, TAKASHI SHIRAI1980 Volume 13 Issue 3 Pages 251-252
Published: June 20, 1980
Released on J-STAGE: April 03, 2006
JOURNAL FREE ACCESSDownload PDF (133K)
- |<
- <
- 1
- >
- >|