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분체공학,유동층,고분자,재료(무기,유기) : 기/액 향류흐름 유동층에서 기포특성의 축방향 변화 및 분포
손성모 ( Son Seong Mo ),윤정호 ( Yun Jeong Ho ),김현태 ( Kim Hyeon Tae ),송평섭 ( Song Pyeong Seob ),강용 ( Kang Yong ),김상돈 ( Kim Sang Don ) 한국화학공학회 2004 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.42 No.2
Axial variation and distribution of bubble properties were investigated in a gas/liquid counter current fluidized beds(0.152m×2.5m) with relatively low-density particles. Chord length, rising velocity and frequency of rising bubbles in the beds were measured and determined by means of dual resistivity probe method. The axial variation and distribution of bubble properties were well visualized by probability number density function, by which the mean value of bubble properties were determined. The mean value and distribution of bubble chord length increased profoundly with increasing axial height above the distributor as well as gas and liquid velocities. The rising velocity and its distribution of bubble also increased considerably with increasing the axial height. The bubble properties such as bubble chord length, rising velocity and frequency were well correlated in terms of the axial position, gas and liquid velocities, and particle density within this experimental conditions.
액체-고체 유동층반응기에서 조작변수가 폐수로부터 회수되는 동분말의 크기에 미치는 영향
송평섭 ( Song Pyeong Seob ),김현태 ( Kim Hyeon Tae ),손성모 ( Son Seong Mo ),강용 ( Kang Yong ),김승재 ( Kim Seung Jae ),김상돈 ( Kim Sang Don ) 한국공업화학회 2003 공업화학 Vol.14 No.7
직경이 0.102 m이고 높이가 1.0 m인 액체-고체 유동층 반응기에서 액체유속(U_(L)), 전류밀도(I) 그리고 두 전극판간의 거리 (L_(AC))와 투입되는 유동 고체입자의 양(W) 등 실험변수가 폐수로부터 회수되는 동 입자의 평균입도크기에 미치는 영향을 고찰하였다. 또한, 반응기내부의 두 전극판(양전극과 음전극) 사이의 영역에서 다상흐름의 수력학적 거동을 설명하기 위해 압력요동을 측정하여 chaos 이론의 개념을 도입하여 해석하였다. 유동층 반응기에서 폐수로부터 회수되는 동 입자의 평균크기는 액체의 유속, 두 전극판 사이의 거리 그리고 유동층 반응기에 투입되는 고체유동입자의 양이 증가함에 따라 최소값이 존재하였으며, 두 전극판 사이의 전류밀도가 증가함에 따라서 회수되는 동 입자의 크기는 점점 감소하는 것으로 나타났다. 두 전극판 사이의 공간에서 측정된 압력요동의 위상공간투영 끌개(attractor)는 두 전극간의 전류밀도가 증가함에 따라 점점 더 분산되었으나, 두 전극판간의 거리(L_(AC))가 회수되는 동 입자의 크기가 최소일 때인 실험범위의 중간값을 가질 때 좀더 분산되고 복잡한 것으로 나타났다. 본 연구의 실험에서 폐수로부터 2~3 ㎛ 이하의 순수한 동 입자를 회수할 수 있었다. Effects of operating variables such as liquid velocity(U_(L)), current density(I) and distance(L_(AC)) between the two electrodes and amount of fluidized solid particles(W) on the mean size of copper powder recovered from the waste water were investigated in a liquid-solid fluidized-bed reactor whose diameter was 0.102m and 1.0 m in height. Pressure fluctuations in the area between the two electrodes(anode and cathode) were also measured and analyzed by adopting the concept of chaos theory, to explain the hydrodynamic behavior of multiphase flow in the area. It was found that the recovered mean size of copper powder showed minimum value with increasing liquid velocity, and with increasing distance between the two electrodes or amount of fluidized solid particle added in the reactor, but it decreased gradually with increasing the current density between two electrodes. The phase space portraits of pressure fluctuations measured in the area between the two electrodes became more scattered with increasing current density, but it was more scattered and complicated in the middle value of L_(AC), at which the mean value of D_(P) showed its minimum value. The copper powder whose mean diameter was less than 2∼3㎛ could be recovered by means of the technique employed in this experiment.