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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Chemical Engineering Research
Journal Basic Information
Journal DOI :
The Korean Institute of Chemical Engineers
Editor in Chief :
Volume & Issues
Volume 18, Issue 6 - Dec 1980
Volume 18, Issue 5 - Oct 1980
Volume 18, Issue 4 - Aug 1980
Volume 18, Issue 3 - Jun 1980
Volume 18, Issue 2 - Apr 1980
Volume 18, Issue 1 - Feb 1980
Selecting the target year
Gasohol and Diesohol: The State of the Art and Prospects (II)
Mok, Young-Il ;
Korean Chemical Engineering Research, volume 18, issue 4, 1980, Pages 203~203
The energy crisis of recent years is primarily a petroleum shortage. Thus because the depletion of world petroleum reserves can now be foreseen, a new form of portable energy will be needed to power gasoline and diesel engines. Alcohol is a portable, clean-burning form of energy that is already in limited use as a partial replacement for gasoline and diesel. The state of the art of gasohol (a blend containing, by volume,
anhydrous alcohol and
gasoline) and diesohol (a blend containing, by volume, 10% or more anhydrous alcohol and 90% or less diesel fuel) as conventional engine fuels is reviewed in two parts, the former in Part(I) and the letter in Part(II). Physico-chemical properties and performance characteristics of the blended fuels are discussed in conjunction with conventional engines. Alcohol-diesel blends exhibit, from one stand point, near interchangeability with, and from a different stand point, better performance characteristics than neat diesel fuels if some hardware modifications can be made. Necessity of product-oriented development work was stressed in order to arrive at "Engineered Fuel Formulations" encompassing as many different designs of engines and fuel compositions as possible. Also, economics aspects including that of producing ethyl alcohol from biomass are discussed.
A Study on Flashing Phenomena -Growth and Rising of a Single Bubble in the Superheated Liquid of a Flash Stage-
Lee, Chai-Sung ; Lee, Sung-Gyu ;
Korean Chemical Engineering Research, volume 18, issue 4, 1980, Pages 215~215
The behavior of a vapor bubble growing and rising simultaneously in a uniformly superheated water was formulated taking into account of liquid inertia, heat conduction in the liquid and nonequilibrium effects at the vapor-liquid interface. Neither experimental data nor overall solutions for the bubble behavior in flash stage have been available as yet. Some illustrative numerical solutions for the entire bubble history were obtained for various superheats. A comparison between our theory and other theoretical solutions was also presented and discussed.
Hydrodynamic Analysis of Viscous Incompressible Fluid Flow in Calendering Processes(I)
Lee, Jae-Wook ; Lee, Ki-Jun ;
Korean Chemical Engineering Research, volume 18, issue 4, 1980, Pages 227~227
Non-Newtonian fluid flow between a pair of rotating cylinders with non-equal size rolls and/or non-equal speed of the rolls is studied theoretically for the power-law fluids at the isothermal condition, using the bipolar cylindrical coordinates which could satisfy the exact boundary conditions. A theoretical analysis of the velocity-, pressure- and shear stress distributions in the flow field is given by solving equations of continuity and motion applying the lubrication approximation. The processing parameters such as volumetric flow rate and total power required to drive the rolls are calculated and presented in terms of the geometrical and kinematical parameters of the asymmetric calendering systems.
Fractional Rate of Surface Renewal and the Effective Interfacial Area of Packing Materials
Lee, Bong-Hee ; Lee, Won-Kook ;
Korean Chemical Engineering Research, volume 18, issue 4, 1980, Pages 239~239
In order to predict the performance of a packed column and the effect of the shape of various packing materials on the performance, a system, where carbon dioxide is absorbed chemically into the
buffer solution containing NaOCl as catalyst, was employed for the study. In this experiment, 1/4", 3/8", 1/2"-half Raschig ring and -half square made of poly-propylene were used as packing materials.
and a were determined from experimental data by Danckwerts-plot method. The empirical and semi-empirical equations for the fractional rate of surface renewal, height of transfer unit and effective interfacial area were obtained as;
is defined as
These equations were examined with the data from other investigators as well as this work, and found good agreements between them.
Dynamics of Flat Blade Stirred Bed Reactors
Park, Myung-Hae ; Lee, Chang-Woo ; Lee, Chul-Soo ;
Korean Chemical Engineering Research, volume 18, issue 4, 1980, Pages 249~249
Dynamics of flat blade stirred bed reactors was studied. The average axial velocity and the axial dispersion coefficient were obtained by the pulse response technique and were correlated using such variables as rotating speed of blade(RPM), slope of reactor(
), feed rate (FR), air velocity(
) and the reactor diameter (D). The dispersion model was found satisfactory and a single parameter
was found to play an important role for the correlations.
Bubble Characteristics in Three Phase Fluidized Beds
Ha, Chang-Sik ; Kim, Sang-Done ;
Korean Chemical Engineering Research, volume 18, issue 4, 1980, Pages 255~255
Measurements of two-dimensional bubble properties in three phase fluidized beds were made using an electroresistivity probe. The effects of fluid flow rates, particle size and the vertical height over the distributor on bubble size, frequency and bubble rising velocity were determined. The bubble frequency decreased and the frequency distribution widened with the bed height. In the present systems, the bubble breakup may be attributed to the increased disturbance of wave length which led to more unstable interface of bubbles in the beds of large particles mixed with small particles. The bubble size increased inversely with particle diameter. Since the Davies and Taylor equation for single bubble and the modelling equation in gas-solid systems were not hold due to bubble coalescence, the empirical correlation for bubble rising velocity was developed as a function of bubble size, fluid velocities and particle sizes.
A Study on Chlorination of Methane
Kim, Seong-Jae ; Park, Jang-Jin ; Lee, Euo-Soo ; Lee, Won-Kyoo ;
Korean Chemical Engineering Research, volume 18, issue 4, 1980, Pages 263~263
Chorination of methane was studied in a 5.08 cm-diameter thermal fluidized bed with silica gel particles in the range of
. The data are expressed in the form of second order irreversible rate equation. The rate constant were determined by plug flow model and experimental data, and plug flow model yielded product distribution in a good agreement with experimental results within the range of experimental conditions. The effect of temperature
, feed mole ratio
, and reaction time
on conversion and product distribution were experimentally investigated to determine the optimum reaction conditions for each chlorinated methane. The optimum reaction temperature was found to be in the range of
for all chlorinated methanes.
Relation between Isothermal and Isobaric Vapor-Liquid Equilibrium
Im, Jin-Nam ; Gwak, Cheol ;
Korean Chemical Engineering Research, volume 18, issue 4, 1980, Pages 273~273
Isothermal vapor-liquid equilibria were measured for the binary systems, 1,2 dichloroethane-n-heptane, 1,2 dichloroethane-n-butanol, and n-heptane-n-butanol, at
using the total pressure method. Vapor compositions were obtained by the Wilson equation and the Redlich-Kister equation. For these binary systems, isobaric vapor-liquid equilibria were estimated by cross plotting isothermal vapor-liquid equilibria data which were obtained from the total pressure method. Also isobaric vapor-liquid equilibria in the ternary system of 1,2 dichloroethane-n-heptane-n-butanol were estimated from the results for the corresponding binary systems by using one parameter Wilson equation. The predicted data were found to be in a good agreement with experimental data.
Coal Utilization and Conversion Technologies
Park, Won-Hun ;
Korean Chemical Engineering Research, volume 18, issue 4, 1980, Pages 285~285
Effective utilization and development of economical conversion technology of coal, which is regarded as one of the most probable alternative energy resources, has been carried out worldwide, and the state of arts for this technology is reviewed to provide a stimulant for similar efforts in energy importing Korea. Fluidized-bed combustion, coal gasification and liquefaction processes are reviewed here extensively.
Present and Future Aspect of Solar Energy Applications
Auh, Paul Chung-Moo ;
Korean Chemical Engineering Research, volume 18, issue 4, 1980, Pages 301~301
Due to the uncertain situation of the future energy supply, Korea must develop her own renewable energy sources such as, especially, the solar energy as alternatives to the conventional energy sources. Extensive R&D efforts are being made to effectively utilize this renewable energy source. A variety of different technologies for utilizing solar energy have been proven to be technically feasible. Here, some of the promising technologies and their applications are briefly described and their potentials are discussed. In addition, this paper defines the technical terminologies and the concepts of the solar heating and cooling systems. Also discussed are the advantages & disadvantages, the initial investment, and the commercialization plan(by the Korean government) of the solar heating systems. Finally, the brief recommendations were made on the practical applicability of each technology according to its priority.