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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 :
KIM JAE JEONG
Volume & Issues
Volume 19, Issue 6 - Dec 1981
Volume 19, Issue 5 - Oct 1981
Volume 19, Issue 4 - Aug 1981
Volume 19, Issue 3 - Jun 1981
Volume 19, Issue 2 - Apr 1981
Volume 19, Issue 1 - Feb 1981
Selecting the target year
Electrochemical Engineering a Science of Its Own
Sigrist, Lukas ;
Korean Chemical Engineering Research, volume 19, issue 4, 1981, Pages 245~245
A glance at the historical development shows that electrochemical engineering became a technical science of its own through the last decades. Principles of optimization and economic evaluation are involved reducing the physical laws to a common denominator, money, un order to perform a quantitative analysis of alternative and optimal routes. Scientific investigations open a window on future techniques of metalplating by pulsating current. Developments in cell design made electrochemical processing quite attractive and competitive to conventional routes, e.g. for waste water treatment.
The Kinetics of Ferrous lon Oxidation by Thiobacillus ferrooxidans
Kim, Seung-Sup ; Kang, Woong-Ki ;
Korean Chemical Engineering Research, volume 19, issue 4, 1981, Pages 251~251
The kinetic nature of
by Thiobacillus ferrooxidans was studied. An irreversible autocatalytic model was proposed and compared with other models. The experiments were carried out to verify the proposed model. The duration of a single experimental run was ranged from 50 hrs to 100 hrs (c.f. previously less than 3 hrs). Both the integral and the initial rate methods were used in analyzing the experimental results. The analysis shows that the proposed irreversible auto-catalytic mechanism is best fitted to the experimental results among the various models.
A Model Study for Combustion of Spherical Anthracite Briquette
Lee, In-Chul ; Rhee, Hyun-Ku ; Park, Won-Hoon ; Park, Won-Hee ;
Korean Chemical Engineering Research, volume 19, issue 4, 1981, Pages 259~259
An experimental study was performed for the combustion of coal mixture having the same composition as the anthracite briquette in domestic use. A mathematical model was also proposed and the results of theoretical analysis were compared to the experimental results. The purpose here is to investigate the combustion characteristics of the anthracite briquette and to develop a relevant mathematical model. Using a spherical sample, we measured the weight change as a function of reaction time by virtue of a spring thermo-balance. Examined and discussed here are the effects of major parameters on the combustion characteristics such as reaction temperature, flow rate of air, and sample size. A shrinking core model was established by taking into account the generation of carbon monoxide on the surface of unreacted core, the oxidation of carbon monoxide in the ash layer and the diffusional resistance through the ash layer as well as the external mass transfer resistance. The result of model analysis reveals that, although the overall trend is in agreement with the experimental observations, it would be necessary toe improve the model by considering the non-isothermal aspect of the combustion system.
Gas Hold-up and Axial Dispersion in a Bubble Column of Electrolyte Solutions
Hahm, Yeong-Min ; Choi, Cheong-Song ; Doh, Dong-Sup ;
Korean Chemical Engineering Research, volume 19, issue 4, 1981, Pages 269~269
Gas hold-up and liquid phase axial dispersion coefficient have been measured in a bubble column of 5.4cm diameter in which ionic solutions (in the range of concentration of 0.001 N to 0.1N) were employed in order to determine the effects of ionic strength on the objective parameters. The gas velocity corresponding to minimum relative velocity is important in determining the ultimate bubbly flow regime, which is transited to turbulent flow. This transition gas velocity,
, is correlated with ionic strength of electrolytes. Effects of gas velocity
, liquid velocity
and especially ionic strength on axial dispersion of liquid and gas phase hold-up are determined. In the turbulent flow regime, the dispersion coefficient was found to be strongly affected by gas and liquid velocity, however, in the case of bubbly flow regime, the coefficient was not much affected by fluid velocities.
A Numerical Simulation of Transient Natural Convection between Horizontal Concentric Cylinders
Lee, Hyung-Mann ; Suh, Moon-Ho ; Lee, Ki-Jun ;
Korean Chemical Engineering Research, volume 19, issue 4, 1981, Pages 281~281
Transient natural convection phenomena in an annulus between horizontal concentric cylinders were studied numerically for the axisymmetric cases using the finite difference schemes. Boussinesq approximation was applied to the equations of motion describing the buoyant circulation of air, and the vorticity-stream function approach was adopted for the solution of the problems. the simulations of temperature distribution, streamline and vorticity variations were performed under the prescribed conditions such that the outside cylinder was maintained at a variable temperature of vertical stratification condition and the inner cylinder was either thermally insulated to be adiabatic or its surface temperature was kept constant.
Gas Mixing in an Annular Fluidized Bed
Kang, Yong ; Yoo, Young-Tai ; Kim, Sang-Done ;
Korean Chemical Engineering Research, volume 19, issue 4, 1981, Pages 291~291
Lateral and axial gas phase mixing have been measured in the annular section of an annular fluidized bed which was constructed from two pieces of 7.6cm-diameter plexiglass cylinder. Effects of gas velocity, particle size and weight percent of added inert particles on gas phase mixing have determined. For lateral mixing, a diffusion type model was proposed to analyze the present system and Schugerl model H was employed to calculate the axial gas mixing coefficients. Both gas mixing coefficients increased exponentially with gas flow rate. Lateral gas mixing decreased with particle size. The addition of inert particles increased lateral gas mixing however, the reverse trend was observed for axial gas mixing with the addition of inert particles. Axial and lateral gas mixing coefficients were correlated in terms of gas flow rate and particle size in an annular fluidized bed.
Hydrodunamic Analysis of Viscous Incomproessible Fluid Flow in Calendering Processes (II) -Viscous heating Effects for Nip flow-
Lee, Jae-Wook ; Lee, Ki-Jun ;
Korean Chemical Engineering Research, volume 19, issue 4, 1981, Pages 303~303
A numerical solution has been developed for the steady state partial differential equations which discribe the flow of non-Newtonian fluids into geometrically and kinematically asymmetric calenders with viscous heating effects. The solution technique combines the equation of motion at the isothermal condition. the asymmetric calendering system is simplified by use of bicylindrical coordinates which establishes uniform size network for each variable. the initial condition is simply that the calender gap is filled completely with certain fluid whose initial temperature is uniformly constant. Viscous heating is shown to drastically change in the velocity and pressure field near the entrance and exit zone. The temperature distribution exhibits two local maxima and a minimum in the direction of flow, and the maximum temperature rise is about
near the roll surface. Numerically stability problem of the steady state equations associated with high viscosity fluid flow is treated and solved by the use of the successive under relaxation method.
Recovery of Nickel from Fuel Oil Ash
Choi, Cheong-Song ; Lee, Won-Hong ; Kang, Woong-Ki ;
Korean Chemical Engineering Research, volume 19, issue 4, 1981, Pages 313~313
The nickel values from the fuel oil ash could be efficiently recovered as double salt, nickel ammonium sulfate hexahydrated crystal (NAS), by the addition of ammonium sulfate to the nickel pregnant liquor from the vanadium recovery process. The amount of ammonium sulfate added has little effect on the crystal size characteristics, but the yield of crystalline precipitate was greatly increased by the addition of ammonium sulfate in excess because of the sharp decrease in solubility of NAS. The recovery of nickel values as NAS was ranged 220 to 230 kg per ton of the fuel oil ash. The nucleation rate was studied in a mixed suspension-mixed product removal cooling crystallizer, which was found to correlate with power-law kinetics of the form
The constant k is a function of operation conditions that include temperature, degree of agitation and fluid characteristics. The value of k was
under the experimental conditions in this investigation.
Computer Calculation of Complex Chemical quilibrium Compositions and Thermodynamic Properties
Yim, Yoo-Jin ; Yoon, Yo-Kil ; Lee, Sung-Moo ;
Korean Chemical Engineering Research, volume 19, issue 4, 1981, Pages 327~327
Considerable numerical calculations are necessary to obtain equilibrium compositions for complex chemical systems. this requires a computer program to do the calculation and the numerical method for this program is described in detail. the complex chemical equilibrium compositions are calculated by a free-energy mininization technique. The program calculations of chemical equilibrium compostios are calculated by a free-energy mininization technique. The program calculations of chemical equilibrium compositions for assigned thermodynamic states such as (T,P) (H,P), (S,P), (T,V), (U,V), or (S,V), The program considers condensed species ans well as gaseous species and permits calculations of other thermodynamic properties
for any chemical system. These results can be applied to the fundamental design and analysis of analysis of equipment such as compressors, turbines, nozzles, engines, shock tubes, heat exchangers, and chemical processing equipment.
An Optimization of the Coal Blending Plon For Cokemaking
Kim, Hark-Ryeoung ;
Korean Chemical Engineering Research, volume 19, issue 4, 1981, Pages 339~339
The Coal Blending Plan for metallurgical cokemaking was optimized with the application of linear programming due to G.B. Dantzig. In this case, it was necessary to take discrimi nation in the selection of the number of the Constraints imposed upon the system, because the number of independent variables of the optimal solution should be restricted by the characteristies of the plant facility. It was found that the optimization method was highly efficient after a series of in-plant experiments.