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특별강연 : 한국액체미립화학회 창립 20주년과 학회의 발전
이창식 ( Chang Sik Lee ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
On the occasion of the 20th anniversary of the Institute of Liquid Atomization and Spray System-Korea (ILASSKorea), this article described the brief history and development process of the society. The ILASS-Korea has continued to prosper the development of an expert society since its foundation on September 30, 1995. The ILASS-Korea has been developed in term of the scientific activities and information exchange for liquid atomization and its application to industrial field during the last 20 years. In this context, the development processes such as an inaugural general meeting, society activities, international cooperation between ILASSKorea and ILASS-organizations, and development process of the society were described briefly.
2001년도 제1회 한국액체미립화학회 이사회 회의록 : 한구액체미립화학회지 투고 논문 작성 요령
김액체 한국액체미립화학회 2001 한국액체미립화학회지 Vol.6 No.1
아래의 원고 작성 요령은 한국액체미립화학회지에 논문을 투고하실 때 저자들께서 원고 작성의 용이함과 학회지 편집에 있어서 논문의 형식을 통일함으로써 보다 효율적이고 좋은 학회지 발간을 위하여 마련하였습니다.
나노유체 : 임계열유속 및 사고 저항성 증진을 위한 크로미아 나노유체 활용
손규민 ( Gyu Min Son ),서한 ( Han Seo ),문성보 ( Sung Bo Moon ),서석빈 ( Seok Bin Seo ),방인철 ( In Cheol Bang ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
Hydrogen explosion can threaten the safety of nuclear power plants as shown in Fukushima accident. When zircaloy (fuel cladding) is oxidized, it generates hydrogen and oxidation speeds up at high temperature. The concept of accident-tolerant-fuel (ATF) aims for enhanced safety response, mitigating oxidation of fuel claddings during accident and chrome coating on zircaloy surface shows promising results in this regard. By forming Cr2O3 (chromia or chrome oxide) layer on the outermost surface when oxidized, it prevents further oxidation inwards. However chrome coatings show some limitations since it forms hydrophobic surface and damages critical heat flux (CHF). Instead, direct coating of chromia layer is proposed in this study. Chromia coating on nichrome wire was done by boiling deposition of chromia nanofluid. Chrome coating with PVD was also prepared for comparison. Pool boiling experiment results show that chromia coated wire’s CHF is approximately twice of bare and chrome coated wires. For explanation of CHF enhancement, contact angle was compared showing chromia coating has hydrophilic surface. To ensure that direct coating of chromia has oxidation resistance, samples are oxidized in furnace and weight gain was compared.
나노유체 : 나노유체를 활용한 APR 1400 부수로 벤치마크 해석
이민호 ( Min Ho Lee ),방인철 ( In Cheol Bang ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
In case of pressurized water reactor, thermal conductivity of coolant is crucial factor for improvement of performance and safety of nuclear power plants. In this report, to enhance thermal conductivity of coolant, nanofluid was used. nanofluid is fluid having particles which have scale of nanometer, called nanoparticles. Silicon carbide, aluminum oxide, and graphene oxide have higher thermal conductivity than pure water. Moreover, they have not too big cross-section with neutron, especially thermal. Over 0.1 % of volume fraction of nanoparticle can make conspicuous difference with pure water. In the present study, three nanoparticles, such as SiC, aluminum oxide, and grapheme oxide, were used as nanofluid to show the effect of thermal conductivity. The volume fraction of nanoparticle was 0.2 % 0.5 %, 1.0 %, and 2.0 %. Thermal conductivity and viscosity of nanofluids were measured by KD2PRO and SV-10 respectively. The measurement data of thermal conductivity and viscosity was applied in the MATRA and CFD APR 1400 analysis. As anticipated, relative to pure water, thermal conductivity of nanofluid was increased and viscosity of nanofluid was also increased. But it was not effective as expectation. Due to lowered specific heat of nanofluid, overall coolant bulk temperature was increased and DNBR was decreased and these tendency was deepened with volume fraction of nanoparticle. CFD and MATRA show similar result
( Mohammed Mohammed ),김기성 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
The demand for a reliable particle cloud temperature measurements is increased in many industries and scientific researches. The particle cloud temperature measurements depends on radiation thermometry at two or more color bands. In this study, we developed a sensitive, fast response and compact online infrared twocolor probe to measure the temperatures of a particle cloud in a phase of two field flow (solid-gas). The probe employs a detector contained two InGaAs photodiodes with different spectral responses, and a largedynamic-gain-range, low-noise current preamplifier harmonized the signal intensities. A powerful and efficient system was constructed for data acquisition, and a LabVIEW based software was developed for consistent operation of all elements and displaying the measured temperature. The developed two-color probe is capable of detecting particle cloud temperatures as low as 300 °C, under dynamic conditions.
포스터 전시회 : 규제기준에 따른 경유 중형트럭의 미량유해물질 배출특성 연구
홍희경 ( Heekyoung Hong ),정성운 ( Sungwoon Jung ),손지환 ( Jihwan Son ),이상은 ( Sangeun Lee ),문선희 ( Sunhee Moon ),성기재 ( Kijae Sung ),김정수 ( Jeongsoo Kim ),김정화 ( Jounghwa Kim ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
As pollutants have been diversified with the acceleration and enhancement of industrial development, an interest in the criteria air contaminants including nitrogen dioxide, sulfur dioxide and dust emitted from heating and industrial facilities, and vehicles has recently been expanded to hazardous air pollutants (HAPs). Although only trace amount of HAPs are released in vehicle exhaust emissions, they have toxic, carcinogenic, bio-accumulative, persisting and diffusing characteristics, and the direct and long-term exposure to them may lead to adverse effects in humans, animals and plants. Particularly, diesel vehicles emit more pollutants if they are lager and become battered. While the number of registered medium-duty trucks is relatively low compared to the overall registered vehicles, their ratio has been steadily increasing. This study was designed to investigate the emission characteristics of unregulated pollutants (Aldehyde and VOCs) as well as regulated pollutants (CO, HC, NOx and PM) from diesel medium-duty trucks. The emission characteristics of unregulated and regulated pollutants were assessed based on regulation standards (EURO 4 and EURO 5) and intake weight (2.5 ton and 5 ton). The results show that unregulated and regulated pollutants remained almost unchanged at higher speeds but decreased at below 23.5 km/h. Reduction in unregulated and regulated pollutants was noticeable in vehicles of recent regulation standards and light intake weight. The analysis of aldehyde using UPLC showed that formaldehyde and acetaldehyde of aldehyde were most dominant. The GC/MS analysis showed that benzene, toluene, ethylbenzene and xylene of VOCs were over 80% followed by toluene, xylene, ethylbenzene and benzene. The results of present study will be contributed to set up HAPs inventory.
포스터 전시회 : 파손된 HNS 탱크로부터의 근접역 유출 특성에 관한 수치연구
김대윤 ( Dae Yun Kim ),정찬호 ( Chan Ho Jeong ),이성혁 ( Seong Hyuk Lee ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
There are 545 HNS having those own unique physical and chemical behavior and they have been classified in 8 groups for each characteristic: dissolver, sinker, floater, evaporator, dissolver/evaporator, sinker/dissolver, floater/evaporator, floater/evaporator/dissolver. When the HNS-spill occurs in the ocean, it might be resulting in a serious risk of personal injury and environmental damage. Therefore, the investigation of leakage behavior is required along their characteristics to classify the hazard area and conduct the cleanup work. The main objective of present study is to numerically investigate the effect of initial hydraulic head on leakage characteristics in the near field from ruptured HNS tank. In particular, the leakage characteristics of styrene, which was typical floater HNS, were examined for different crack positions by using the commercial CFD code (ANSYS FLUENT V.16.1). From the numerical results, it was found that leakage velocity and HNS spill-volume was changed with respect to crack positions and initial hydraulic heads of HNS. When the crack position was getting closer to surface of the sea, the HNS-spill velocity increased. These numerical results would be useful in predicting maximum propagation length and evolution of HNS concentration on the sea surface.
포스터 전시회 : 연료첨가제 주입 전,후 승용차의 규제물질 배출현황
정성운 ( Sungwoon Jung ),손지환 ( Jihwan Son ),홍희경 ( Heekyoung Hong ),성기재 ( Kijae Sung ),김정수 ( Jeongsoo Kim ),김정화 ( Jounghwa Kim ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
This study was designed to investigate characterization of regulated pollutants (CO, HC, NOx and PM) emitted from 134 diesel and gasoline passenger cars based on emission standards according to fuel additives. The experiments using chassis dynamometer were conducted under NEDC and CVS-75 modes. Comparison for fuel additive management and test between Korea, USA, EU and Japan, Korea was more strict than others. For with/without fuel additives according to diesel emission standards, NOx of EURO 4 and EURO 5 showed a relatively similar tendency. In the case of PM reduction rate, EURO 5 was over 20% decreased than EURO 4. In the case of standard deviation/average ratio for gasoline vehicles, variation interval was big for LEV 23.3 ~ 58% and ULEV 31.6 ~ 56.4%. Following the imposition of stricter regulations (EURO 5 and ULEV), difference rate for standard deviation was big. Especially, in the case of diesel vehicles, difference rate for NOx 68% and PM 48% was the biggest. The results of present study will contribute to set up emission standards for Korean fuel additives.
나노유체 : 초기 직경 변화에 따른 Toluene 액적의 연소 특성
임영찬 ( Young Chan Lim ),서현규 ( Hyun Kyu Suh ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
The main purpose of this study is to provide the information of soot generation of toluene fuel droplet. To achieve this, this paper provides the experimental results on the different initial diameter of toluene droplet combustion characteristics conducted under equivalent ambient pressure(P(amb)) and oxygen concentration(O2) conditions. Visualization of single fuel droplet was performed with high resolution CCD camera and visualization system. At the same time, ambient pressure(P(amb)) and oxygen concentration(O2) was maintained by ambient condition control system. Soot volume fraction(f(v)) was analyzed and compared on the basis of intensity ratio(I/I0) of background image. The result of soot generation was almost the same regardless of initial droplet diameter since thermophoretic flux is not much changed under the same ambient conditions. Soot standoff ratio(SSR) of 2mm diameter showed unstable variation characteristics due to the short available measuring time.