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Screen Blade Turbine Impeller 의 소요동력 및 혼합특성
도동섭 한국화학공학회 1970 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.8 No.4
The power consumption and the mixing time in a 6 inch diameter stirred vessel, equipped with a 6 blade screen blade turbine impeller in its center, have been measured by means of turn-table and conductivity cells, and compared with the results of a 6 blade flat blade turbine impeller. The rotational speeds of the impeller ranged from 150 to 650 r. p. m. and the liquid viscosities ranged from 0.79 to 164 centipoises. The screen blade turbine consumed much less power than the flat blade turbine for performing the same degree of mixing in the range of the experiment though there was a decreasing tendency of the mixing efficiency for the screen blade turbine as the liquid viscosity increased. The mixing time has also been measured in a two impeller system and the results have proved that the screen blade turbine may be a promising equipment, especially for some continuous multi-stage mass transfer operations, performing better local mixing with less backmixing.
도동섭,강웅기,서영갑,손명환 고려대학교 공학기술연구소 1970 고려대학교 생산기술연구소 연구보고 Vol.1 No.1
The treatment of waste water containing nicotine was studied by the methods of air oxidation, exposure to sun-light, UV decomposition, precipitation, adsorption with active carbon, and adsorption with activated clay. Of these, only the last three methods appeared to separate the nicotine to a satisfactory level. These methods were compared from an economic point of view and the method of adsorption with activated clay appeared the most feasible. The equipments for a continuous treatment system were also designed.
현탁기포탑에서 고체입자가 기체 체류량과 물질전달에 미치는 영향에 관한 연구
도동섭,박찬진,정병훈,홍성범 고려대학교 공학기술연구소 1987 고려대학교 생산기술연구소 생기연논문집 Vol.23 No.1
The influence of suspended inert solid particles on the gas holdup and mass transfer was investigated by measuring expansion of height and CO₂ concentration at a solid suspended bubble column in the presence of 0-6% by volume of particles and 47.50-135.48 ㎛ by particle diameters. It was found that at a given superficial gas velocity the gas hold up and mass transfer was smaller than those without solid particles and this decrease was greater at high solid concentration and large particle size. An energy balance method and eddy cell model was proposed to explain this behavior.
도동섭 한국화학공학회 1970 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.8 No.1
The movements of silica-alumina particles in a gas fluidized bed of 28 cm I. D. were studied with a modified thermistor probe. The probe developed in this study was found to be able to measure the mass velocity and direction of particle flow in a fluidized bed. Pasticles moved upwards near the center of the bed and downwards near the wall. The magnitude of the mass velocity and the cross-sectional area through which the particles move upwards increased with increasing air velocity and position from the bed support. The profiles of heat transfer coefficient between the surface of a small heating element and the bed were found to be very similar to those of particle velocity, which explains that the heat is transfered mainly by the movements of solid particles and the effect of fluid is minor.
" 현탁입자가 물질전달속도증진에 미치는 영향의 차원해석적 연구 "
도동섭,박찬진 고려대학교 공학기술연구소 1986 고려대학교 생산기술연구소 생기연논문집 Vol.22 No.1
In order to investigate the influence of suspended inert solid on the enhancement of mass transfer rate, multiple regression analysis was done for correlative equation derived from dimensional analysis of variables using limiting current density for the reduction of ferric cyanide obtained from a rotating disk electrode system. Multiple regression analysis was conducted with eight different particle surface to disk surface ratios, with Reynolds numbers in the range of 17,800-89,200 and with volume fraction of particles in the range of 0.05-0.25. It was found that the limiting current density increased with rise of Reynolds numbers and with that of volume fraction of particles, but it decreased with rise of particle surface to disk surface ratio in the range of large particle size and increased with rise of particle surface to disk surface ratio in the range of small particle size.
충전 기포탑에서 유속 및 점도가 축방향 혼합에 미치는 영향
도동섭,한균석 한국화학공학회 1976 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.14 No.6
기포탑에 원통형 금망을 충전시켜 액체의 점도와 기체 및 액체의 유속에 따른 축방향 분산 계수를 tracer 기법으로 측정하였다. 연구 결과에 의하면 축방향 분산 계수는 기체 및 액체의 유속이 증가함에 따라 증가하고 액체의 점도가 증가함에 따라 감소하며 그 관계는 다음과 같은 실험식으로 표시 할 수 있다. D=24.4U^(0.81)_l U^(0.26)_g μ^(-0.30) Dispersion coefficients of liquid were measured in a bubble column packed with screen cylinders. Impulse response technique was applied to measure the dispersion coefficient as a function of the gas and liquid flow rates and the liquid viscosity. The axial dispersion coefficient was found to increase with increasing gas and liquid velocities and with decreasing liquid viscosity within the range of experimental conditions. The relationship could be expressed by the following correlation: D=24.4U^(0.81)_l U^(0.26)_l μ^(-0.30)