입도가 탈 액체에 미치는 영향

車민煥 서울市立大學校 1995 論文集 Vol.29 No.-

Experiments were performed for finding the dependence of liquid content of solid particulate bed on the particle size, using glass beads as experimental material under centrifugal force field. At small centrifugal force the influence of particle size on the liquid content was potent, but the dependency on particle size decreased as centrifagal force increased. The saturation degree is constant as 8% when 2.2< 수식입력불가 <8.

입자충전층에서 평형포화도에 관한 연구

車岷煥 서울市立大學校 1989 論文集 Vol.23 No.-

With batchwise cylindrical centrifugal filter, using glass beads as packing material, undrainable residual water contained in a packed bed was studied and discussed. The particle size of the glass beads were 191, 475 530 ㎛ and the bed height 12, 24, 36 mm. The residual water of a higher packed bed is greater than that of a lower one at same Bo₁value. Near the Bo₁= 100 all the packed bed have approximately same residual water, S = 0.075∼0.085, without dependence on the partclie sizes and particle bed heights of the packed bed.

원심력을 이용한 고-액혼합물의 여과분리

차민환 서울市立大學校 1986 論文集 Vol.20 No.1

The object of the present work was to obtain a general correlation which predicts the residual saturation of the wetted porous media The correlation takes into account the depth of packed bed, liquid density, surface tension, contact angle, centrifugal force and particle size etc. A batch type cylindrical tube centrifuge was used in this study, The experiment was performed with 6 size glass beads that were wetted with distilled water and packed bed height of 12mm, 24mm, and 36mm. Operation time was varied to 240 seconds and centrifugal force to 800G. The influence of caillary rise on the residual saturation of the packed bed is negligible when ??? + Bo₂is greater than 2.2 And the residual saturation degree is constant as 8% when ??

연통식관반반응기의 불완전 혼합

차민환 忠北大學 1979 論文集 - 忠北大學校 Vol.17 No.-

-본문참고-

원심력장에서 모세관 액체상승 높이

차민환 서울市立大學校 1987 論文集 Vol.21 No.2

An experimental work on the capillary rise height of packed bed of glass beads in a centrifugal force field was fulfilled. The experiment was performed with 3 size glas beads and bed heght of 12mm, 24mm, 36mm. The capillary rise heights measured in the centrifugal force field was fulfilled. The experiment was performed with 3 size glas beads and bed heght of 12mm, 24mm, 36mm. The capillary rise heights measured in the centrifugal force agreed well with those in the gravitational forcefield. The relation between capillary rise height and particle size is hs=1. 34×10??dp.-15

중력장에서 입자층의 탈액체에 관한 연구

睦廷均,車岷煥 서울市立大學校 1990 論文集 Vol.24 No.-

To obtain a more simplified method for analyzing the dewatering mechanism of particulate beds in gravitational field the conventional equation for flow in capillaries is empirically modified in view of the existence of filmwise liquid. A simple equation for prediction the average saturation vs, the time is presented, by considering the beds as an assembleage of circular monosize capillaries determined from packed bed porosity and particle size. The progress of dewatering process can be followed using local saturation data measured throughout depth of the bed by means of the electrical conductivity, and good agreement has generally been found between computed and experimental data. It is obtained in terms of the average saturation and Zeitz number(Nzt). ??

반도체를 이용한 물의 광분해 : 콜로이드성 반도체촉매 ZnxCd₁-xS의 광활성

한명남,최석호,차민환 서울市立大學校 1997 論文集 Vol.31 No.-

Photosplitting of water based on the photocatalytic chemical reaction using ZnxCd1-xS, where x is 1, 0.5 and 0, was studied. DHP(dihexadecylphosphate)vesicle, HMP(hexametaphosphate)vesicle as stabilizer and benzyl alcohol as a donor were used respectively. The hydrogen volume generated on the several conditions by CdS was highest and decreased with x value. The rate of hydrogen generation increased with benzyl alcohol addition. Hydrogen generation experiment showed DHP is the better stabilizer than HMP and xenon lamp is the better light source than sun.

계면활성제 DHP(dihexadecylphosphate)와 HMP(hexametaphosphate) vesicle 분산계에서 콜로이드성 반도체 ?? 의 광특성

최성희,한명남,차민환 서울市立大學校 1996 論文集 Vol.30 No.-

The photoactivities of colloidal semiconductors ?? which are good photocatalysts for H2 production by visible light radiation were studied. Using DHP(dihexadecylphosphate) and HMP(hexametaphosphate) vesicles as colloidal stabilizer various ?? were in situ generated on the vesicle surface. The photoactivities of the systems approached to that of CdS with Cd2+ increasing and that of ZnS with ?? decreasing. HMP showed better absorbance than DHP but DHP was better than HMP in relative fluorescence intensity. The wavelength showing maximum peaks of fluorescence intensity were 490nm for CdS and 350, 400nm for ZnS.

噴霧乾燥機設計를 爲한 重要因子의 特性

柳萬馨,金榮泰,車岷煥 울산대학교 1976 연구논문집 Vol.7 No.1

본 연구는 분무건조기의 설계에 있어서 Atomizer의 조작조건에 따른 여러인자를 연구하였다. Slurry 상으로된 용액을 건조열공기과 접촉시켜서 짧은 시간에 입자로서 건조시키는 것이었다. 건조속도 및 온도분포, 분무기의 분사속도 등을 한정입자로 하여 실험하였다. This study was carried out to correlate the very important factors and derive an equation for design of spray drying chamber in general form including operating conditions of atomizer. Taking the largest frop among spray particles as a limiting particle correlate the trajectory equation, drying time of the particle and the parameters which determine the volume of a drying chamber. Temperature difference between the dry bulb and wet bulb at various local points was measured and compared with over-all temperature difference between inlet and outlet of the chamber.

현장 미생물을 이용한 생물학적 복합토양정화공정에 관한 연구

차민환(Cha Minwhan),이한욱(Lee Hanuk),박재우(Park Jaewoo) 한국지반환경공학회 2010 한국지반환경공학회논문집 Vol.11 No.5

본 연구는 생물학적 지상처리 토양정화공정을 기본으로 생물반응기, 롤형 접촉산화장치(rolled pipe type of contact oxidation system, RPS), 화학처리장치의 처리과정을 통해 유류, 중금속, 영양염류로 오염된 토양 및 지하수를 동시에 정화ㆍ복원할 수 있는 생물학적 복합토양정화공정을 개발·검증하고자 실시하였다. 실험을 통해 현장 토양 중에 있는 토양정화효율이 우수한 5종의 미생물을 분리ㆍ선발하였고, 토양으로부터 유류를 효과적으로 분리하기 위한 계면활성제로는 Anion과 Nonion계 복합제가 가장 우수한 것으로 확인되었는데, 오염된 토양에 계면활성제를 처리한 후 선발된 미생물을 혼합해 적용하는 것이 가장 효율적인 것으로 나타났다. 토양정화조를 이용해 석유계총탄화수소(Total Petroleum hydrocarbon, TPH)로 오염된 토양을 처리한 결과, 5,000㎎/L 내외의 저농도 오염시 28일간 90.0%, 10,000㎎/L 이상의 고농도 오염시 81일간 90.7%의 처리효율을 나타냈으며, 토양정화조에서 배출된 침출수를 생물반응기로 1차 처리하고 롤형 접촉산화장치로 2차 처리한 결과, BOD 90.6%, CODMn 73.0%, SS 91.9%, T-N 73.8%, T-P 65.7%의 평균 처리효율을 얻을 수 있었다. 이후 응집제를 통한 화학처리장치를 적용하여 중금속을 99.0% 이상 제거하였다. The research is intended to develop and verify a biological complex soil treatment process to treat and restore soil and groundwater which is contaminated with oil, heavy metals, and nutrients through experiments with the series of treatment process such as bioreactor, rolled pipe type of contact oxidation system(RPS), and chemical processing system. 5 microbial strains were separated and selected through experiment, whose soil purification efficiency was excellent, and it was noted that anion- and nonion-series of complex agent was most excellent as a surfactant for effectively separating oils from soils. Method to mix and apply selected microbes after treating the surfactant in the contaminated soil was most effective. The removal efficiencies of total petroleum hydrocarbon (TPH)-contaminated soil about 5,000㎎/L and above 10,000㎎/L were approximatly 90.0% for 28 days and 90.7% for 81 days by soil remediation system and the average removal efficiencies of BOD, CODMn, SS, T-N, and T-P in leachate were 90.6, 73.0, 91.9, 73.8, 65.7% by the bioreactor and RPS. The removal efficiency was above 99.0% by chemical processing system into cohesive agents.