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미립자공학,유동층,고분자,재료 : 무기, 유기 ; 점성슬러리 기포탑에서 작은 기포의 체류량 특성
진해룡 ( Hae Ryong Jin ),송양호 ( Yang Ho Song ),강용 ( Yong Kang ),정헌 ( Heon Jung ),이호태 ( Ho Tae Lee ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.1
Holdup characteristics of small bubbles were investigated in a viscous slurry bubble column. The phase holdup of small bubbles was obtained from the knowledge of total bubble{gas) holdup and large bubble holdup, which were measured by mean of static pressure drop method and dual resistivity probe method, respectively. Effects of gas velocity, viscosity of continuous liquid phase and solid fraction in the slurry phase on the small bubble holdup as well as holdups of total bubble{gas) and large bubble in a viscous slurry bubble column. The small bubble holdup increased with increasing gas velocity but decreased with increasing liquid viscosity or solid fraction in the slurry phase. In addition the fraction of small bubble in the total bubble(gas) holdup increased with increasing gas velocity but decreased with increasing liquid viscosity or solid fraction in the slurry phase. It was revealed that the rising velocity of large bubble did not related to the holdup of small bubble in a viscous slurry bubble column.
서명재 ( Myung Jae Seo ),진해룡 ( Hae Ryong Jin ),임대호 ( Dae Ho Lim ),임호 ( Ho Lim ),강용 ( Yong Kang ),전기원 ( Ki Won Jun ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.2
Size verification of small and large bubbles in a bubble column was investigated by employing the dynamic gas disengagement (DGD) method and dual electrical resistivity probe (DRP) method, simultancously. The holdups of large and small bubbles in the bubble column in a given operating condition were obtained by means of the DGD method by measuring the pressure drop variation in the column with a variation of time after stopping the gas input into the column. The size and frequency of bubbles were measured by the DRP method in the same operating condition, from which the bubble holdup of each range of size was obtained. The verification of size in determining the large or small bubbles was decided by comparing the holdups of large or small bubbles measured by the DGD method with that measured by the DRP method. Filtered compressed air and tap water were used as a gas and a continuous liquid medium. The diameter and height of the bubble column were 0.102 m and 1.5 m, respectively. The demarcation size between the large and the small bubbles in the bubble column was 4.0~5.0 mm; the demarcation size was about 5.0 mm when the gas velocity was in the relatively low range, but about 4.0 mm when the gas velocity was in the relatively high range, within this experimental conditions.
박지희(Ji-Hui Park),진종환(Jong-Hwan Jin),김현진(Hyun-Jin Kim),박해룡(Hae-Ryong Park),이승철(Seung-Cheol Lee) 한국식품영양과학회 2005 한국식품영양과학회지 Vol.34 No.1
왕겨에 80, 90, 100, 110, 120, 130, 140℃에서 각각 10, 20, 30, 40, 50 그리고 60분 동안 원적외선을 조사한 후, 메탄올 추출물을 제조하여 총 페놀함량과 DPPH 라디칼 소거능의 변화를 측정하였다. 총 페놀함량의 경우 무처리구에서는 51.6μM이며, 원적외선을 110℃에서 60분간 처리한 왕겨의 추출물에서는 104.3 μM이었다. 또한, DPPH 라디칼 소거능의 경우 무처리구에서는 16.23%이며, 원적외선을 120℃에서 60분간 처리한 왕겨의 추출물에서는 69.40%로 관찰되었다. 이상의 결과는 적당한 조건에서의 원적외선 조사가 왕겨에 존재하는 페놀 화합물의 추출을 촉진하며 항산화능을 향상시킴을 의미한다. The effect of far-infrared (FIR) irradiation on the antioxidant activity of extracts from rice hulls was evaluated. Rice hulls (9 g) were placed in Pyrex petri dishes (8.0 ㎝ diameter) and irradiated at 80, 90, 100, 110, 120, 130 or 140℃ for 10, 20, 30, 40, 50 or 60 min with a FIR heater, respectively. After FIR irradiation, methanol extract of rice hulls was prepared, and total phenol contents (TPC) and radical scavenging activity (RSA) of the extracts were determined. FIR irradiation of rice hulls at 110℃ for 60 min increased TPC of the methanol extract from 51.6 μM to 104.3 μM compared to those of non-irradiated control. The irradiation at 120℃ for 60 min also increased RSA of the extract from 16.23% to 69.40%. These results indicated that appropriate FIR irradiation onto rice hulls could liberate the covalently bound phenolic compounds that have antioxidant activities.
삼상슬러리 기포탑에서 액상의 표면장력이 열전달 계수에 미치는 영향
임호 ( Ho Lim ),임대호 ( Dae Ho Lim ),진해룡 ( Hae Ryong Jin ),강용 ( Yong Kang ),정헌 ( Heon Jung ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.3
Characteristics of overall heat transfer were investigated in a three-phase slurry bubble column with relatively low surface tension media, which has been frequently encountered in the fields of industry. The heat transfer phenomena was examined in the system which was composed of a coaxial vertical heater and a proper of bubble column. The heat transfer coefficient was estimated from the measured mean value of temperature difference between the heater surface and the column proper at the steady state condition. Effects of gas velocity (UG), solid fraction in the slurry phase (CS) and surface tension (σ L) of continuous liquid media on the overall heat transfer coefficient (h) in the bubble column were determined. The mean value of temperature difference was estimated from the data of temperature difference fluctuations with a variation of time. The amplitude and mean value of temperature difference fluctuations with respect to the elasped time appeared to decrease with decreasing the surface tension of liquid phase. The overall heat transfer coefficient between the immersed heated and the bubble column increased with an increase in the gas velocity or solid fraction in the slurry phase, but it decreased with an increase in the surface tension of continuous liquid media, The overall heat coefficient in the slurry bubble column with relatively low surface tension media was well correlated in term of operating variables and dimensionless groups within this experimental conditions.
GIS를 활용한 도로의 종단경사 분석 및 위험구간 평가
서은수(Seo, Eun Su),최세휴(Choi, Se Hyu),김형일(Kim, Hyung Il),진해룡(Jin, Hae Ryong) 대한공간정보학회 2011 한국공간정보학회 학술대회 Vol.2011 No.10
우리나라는 국토의 70%가 산으로 되어 있으며 이는 도로 설계 시 잦은 종단 및 평면선형구간을 유발하게 된다. 종단 및 평면 선형구간은 특성상 교통사고 발생률이 높으며, 특히 규정과 맞지 않게 설계된 구간은 사고 발생률을 더욱 높아지게 하여 운전자의 안전을 위협할 뿐만 아니라, 원활한 도로소통에도 부정적인 영향을 미치게 된다. 따라서 본 연구에서는 이러한 문제점들을 해결하기 위해 GIS를 활용하여 종단경사 분석 및 위험도로의 평가를 하고자 한다. 본 연구에서는 국립지리정보원에서 제공하는 1:1000 수치지형도에서 ESRI사의 ArcGIS를 통해 도로가 도로의 종류, 위치 및 설계속도에 따른 최대종단경사 규정에 적합한지 분석함으로써 위험도로 구간을 찾아내는 인터페이스를 설계ㆍ구현하였으며, 분석 결과를 Google Earth의 위성사진과 중첩하여 시각화하였다.