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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 17, Issue 6 - Dec 1979
Volume 17, Issue 5 - Oct 1979
Volume 17, Issue 4 - Aug 1979
Volume 17, Issue 3 - Jun 1979
Volume 17, Issue 2 - Apr 1979
Volume 17, Issue 1 - Feb 1979
Selecting the target year
Heat Transfer between Gas Fluidized Bed and Vertical Tubes
Kim, Sang-Done ;
Korean Chemical Engineering Research, volume 17, issue 2, 1979, Pages 85~85
Overall heat transfer coefficient correlations are given for fluidized bed in which vertical tubes are immersed. Correlations available in the literature are surveyed and compared on a consistant basis. Effects of mass flow rate, particle size, solid concentration, solid and fluid thermophysical properties, immersed tube location, bed pressure and packing materials on heat transfer coefficients were summarized. In order to understand the fundamental mechanisms of heat transfer, wall to fluidized bed heat transfer is also reviwed. Those correlations on overall heat transfer coefficients are evaluated and find that the most appropriate one for predicting overall heat transfer coefficients between fluidized bed and vertically immersed tubes is one of Tamarin and Khasanov.
A Numerical Study of Unsteady non-Newtonian Fluid Flow into a Rectangular Cavity
Suh, Moon-Ho ; Lee, Ki-Jun ;
Korean Chemical Engineering Research, volume 17, issue 2, 1979, Pages 99~99
Unsteady free surface flow phenomena of a non-Newtonian fluid in a two-dimensional rectangular cavity are studied by numerically solving equations of continuity and momentum using the power-law fluid model. The marker and cell method and the DuFont-Frankel finite difference approximation are utilized in the present numerical experiment. The iniial condition is simply that the cavity is empty. A no slip boundary condition is applied at the walls, while at the free surface zero tangential stress is assumed. Physical properties of rigid PVC melt are used and computations are carried out for two different average inlet velocities. The numerical stability problem associated with high viscosity flows can be overcome by the use of the DuFont-Frankel finite difference method. The calculated results provide not only pressure and viscosity field but also a visual observation of the flow pattern by means of marker particles.
Temperature Effect on Solid Mixing in a Gas-Fluidized Bed
Kim, Hai-Sik ; Lee, Won-Kook ;
Korean Chemical Engineering Research, volume 17, issue 2, 1979, Pages 109~109
The effect of temperature on solids mixing rate was investigated quantitatively by measuring the residence time distribution (TRD) in a co-current gas-solid fluidized bed. The variables selected for this investigation were temperature, gas flow rate and aspect ratio which is ratio of the bed height to diameter. The experimental results showed that the onset of fluidization occurred earlier than the expected velocity as the temperature rise. The results also showed that the gas flow rate and aspect ratio had a marked effect on the mixing pattern of solids, but temperature elevation increased the mixing effect slightly.
The Oxygen Transport to the Membrane Covered-Electrode in Stagnation Flow
Lee, Chang-Woo ; Chang, Ho-Nam ;
Korean Chemical Engineering Research, volume 17, issue 2, 1979, Pages 117~117
The current response of a membrane covered-electrode with respect to the fluid motion in stagnation flow was investigated in this study. The mathematical model was set up to analyze oxygen transport in this flow regime. The current predicted by the model was compared with the results of the experiments performed using polyethylene film and platinum cathode. One dimensional model was in good agreement with the experimental results when the thickness of hydrodynamic boundary layer was smaller than or comparable to the radius of the electrode, but it did not agree well when the thickness exceeded the radius of the electrode. This may be due to the reason that the radial diffusion term neglected in one dimensional model becomes important as well as the axial diffusion term. It appeared that the current response became less sensitive to the hydrodynamics of the outside of membrane as the thickness of membrane increased.
Failure of a Process Waste Heat Boiler
Kim, Tae-Moon ;
Korean Chemical Engineering Research, volume 17, issue 2, 1979, Pages 125~125
The Feasibility of the Pneumatic Refuse Collection System in Korea
Suh, Dong-Soo ; Jun, Young-Min ;
Korean Chemical Engineering Research, volume 17, issue 2, 1979, Pages 133~133
Pneumatic Refuse Collection (PRC) system and it's machinery components are briefly introduced, which is new means of the city refuse collection, and two equations which can be used in estimation of required pump house power and total construction cost of the PRC system are shown. And the economic feasibility of the system is studied at high density residential area in Seoul. In this work the PRC system is compared with the compactor truck collection system which has more advantages than the common truck collection systems and it becomes clear that the PRC system is more economical than compactor truck system in Korea, too; with 20 % of annual wage increasing rate the break even point comes after 4 year; with 10 %, it comes after 6.6 years; the PRC system has 40 years life cycle. And the time when the break even point would be on the first year is estimated to be 9 years after from now under 10 % wage increasing rate.