• Title/Summary/Keyword: Oil Mist

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Analysis of Oil-Mist-Detector applied Capacitance Sensor (용량센서를 적용한 오일증기검출기 거동 해석)

  • Lee G.S.;Kim T.O.;Kim H.Y.;Ahn J.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.279-280
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    • 2006
  • This paper analysised Oil-Mist-Detector applied Capacitance Sensor which protects Diesel engine & human from explosion by detecting density of oil mist distribution. Assuming that distance between oil mists is same, Capacitance sensor plates & all oil mists could be analogized to capacitors. From equivalent circuit of Oil-Mist-Detector, variation of Capacitance which is related to Oil Mist's diameter & density of oil mist distribution is obtainable.

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Ecological Grinding Technology Using Compressed Cold Air and Oil Mist (압축냉각공기와 오일미스트를 이용한 환경친화 연삭가공기술)

  • 이석우;최헌종;허남환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.24-27
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    • 2002
  • The environmental problems by using coolant demanded the new cooling methods. As one of them, the studies on the finding with compressed cold air and oil mist have been done. The cooling method using compressed cold air was effective through going down the temperature of compressed air supplied below $-25^{\circ}$ and increasing the amount of compressed cold air, but had not enough cooling effect due to the low performance of lubrication. Therefore, the cooling methods using oil mist newly were suggested. This method can satisfy both cooling effect and lubrication with only small amount of coolant, also have the benefit in the point of decreasing the environmental pollution. This paper focused on analyzing the grinding characteristics of the cooling method using oil mist. The grinding test according to compressed cold air, oil mist spray pressure and oil mist supply direction were done.

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Determining Factors to Enhanced Oil Mist Filter Efficiency Using CFD Modeling (CFD모델링을 통한 오일 미스트필터효율 향상 결정요소에 관한 연구)

  • Shin, Hee-Jae
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.10
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    • pp.119-127
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    • 2021
  • Small drops in gas cause some problems for downstream equipments such as turbine, compressor and etc. In some cases, we are obliged to remove hazardous liquid mist from gas. In order to remove water or other liquids from the gas, there are some equipments like mesh mist eliminator and vane-plate mist eliminator. oil mist filter is a kind of liquid eliminator equipments used to remove the liquid with 1-10um droplet diameter from the gas. In this paper is determine the factors affecting the oil mist filter efficiency using CFD. length and angle of the filter were considered and the results and compare the results of the efficiency tests, showed error of less than 3%. optimum filter can remove more than 87.3% between 1 and 10um of oil mist.

Exposures to Oil Mist by Metal Machining Shop Workers and Analysis of Some Oils (일부 절삭유 제조 및 취급 사업장의 오일 미스트의 노출농도 및 성분에 관한 연구)

  • 정동인;변상훈;박승현;오세민;문영한
    • Journal of environmental and Sanitary engineering
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    • v.13 no.3
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    • pp.121-127
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    • 1998
  • This study investigated exposures to oil mist obtained from an cutting oil manufacture shop and 5 machining shops and also analysis of some oils. The results were that geometric average concentrations of oil mist were $0.29 mg/m^3$, which was less than current $TLV(5mg/m^3$) in Korea. The proper case of either type of system will ensure that atmospheric concentrations of oil mist in machine shops will be within the TLV. It should be remembered, however, that this TLV was established before there was any suggestion that in the inhalable of oil mist might rarely be carcinogenic, and so it seems prudent to keep atmospheric content as low as possible. The analysis of insoluble cutting oils with GC-MSD showed that considerable suspected PAHs were contained. But soluble cutting oil(KSM-W2) didn't almost contain PAHs.

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Experimental and Numerical Investigation of the Effect of Load and Speed of T-GDI Engine on the Particle Size of Blow-by Gas and Performance of Oil Mist Separator (T-GDI 엔진의 속도 및 하중이 블로우바이 가스의 오일입자 크기와 오일분리기 성능에 미치는 영향에 대한 실험 및 수치적 연구)

  • Jeong, Soo-Jin;Oh, Kwangho
    • Journal of ILASS-Korea
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    • v.25 no.4
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    • pp.162-169
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    • 2020
  • The worldwide focus on reducing the emissions, fuel and lubricant consumption in T-GDI engines is leading engineers to consider the crankcase ventilation and oil mist separation system as an important means of control. In today's passenger cars, the oil mist separation systems mainly use the inertia effect (e.g. labyrinth, cyclone etc.). Therefore, this study has investigated high efficiency cylinder head-integrated oil-mist separator by using a compact multi-impactor type oil mist separator system to ensure adequate oil mist separation performance. For this purpose, engine dynamometer testing with oil particle efficiency measurement equipment and 3D two-phase flow simulation have been performed for various engine operating conditions. Tests with an actual engine on a dynamometer showed oil aerosol particle size distributions varied depending on operating conditions. For instance, high rpm and load increases bot only blow-by gases but the amount of small size oil droplets. Submicron-sized particles (less than 0.5 ㎛) were also observed. It is also found that the impactor type separator is able to separate nearly no droplets of diameter lower than 3 ㎛. CFD results showed that the complex aerodynamics processes that lead to strong impingement and break-up can strip out large droplets and generate more small size droplets.

Fundamental Design of Cyclone Collector for Oil Mist (오일미스트용 사이클론 집진기에 관한 기초 설계 -오일미스트 및 슬러지 입자 융합연구-)

  • Jang, Sung-Cheol;Ahn, Hwi-Woong;Lee, Chan-Kyu
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.22 no.2
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    • pp.223-227
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    • 2013
  • Dust collecting performance of cyclone collector for oil mist was alalyzed in the study. The purposes of using cutting fluid during cutting have been colling, lubricating, chip washing and anti-corroding. However, the present manufactaring industry restricts the use of cutting fluid because cutting fluid confains poisonous substances which are harmful to the human body. Also, the optimum design oil-mist collector. The new oil mist collector was designed. In the near future, this device must be tested in the real machining center and CNC machine. Cutting using oil-mist showed better cutting characteristics than dry, air and fluid cutting with respect to by cutting force, tool wear and surface roughness. The model(A, B Type cyclone) of the set of fixture and alveolus are made by using a CAE software. Finally, we have obtained a model A Type solution by using orthogonal array. Therefore, it could be confirmed that as the model-A was increased and model-B was decreased, cut diameter was decreased.

A Study on the Grinding Characteristics according to Oil Mist Supply Method (오일 미스트 분사 방법에 따른 연삭특성)

  • 허남환;이석우;최헌종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.254-257
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    • 2002
  • As the large Coolant amount used of a machine holds mass serious trouble recently, an environment pollution is increased, and a machine is conquering large specific gravity in an empty cost plane. It is the stage that must reexamine the parts washing that processing is later with this current way or a problem of a liquid waste treatment back. The environmental problems by using coolant demanded the new cooling methods. As one of them, the studies on the grinding with compressed cold air and oil mist have been done. The cooling method using compressed cold air was effective through going down the temperature of compressed air supplied below -$25^{\circ}C$ and increasing the amount of compressed cold air, but had not enough cooling effect due to the low performance of lubrication. Therefore, the cooling methods using oil mist newly were suggested. This method can satisfy both cooling effect and lubrication with only small amount of coolant, also have the benefit in the point of decreasing the environmental pollution. This paper focused on analyzing the grinding characteristics of the cooling method using oil mist. The grinding test according to compressed cold air and oil mist supply direction were done.

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Exposure assessment of Polynuclear aromatichydrocarbons(PAHs) for heat treat workers using Metalworking fluids (금속가공유 취급 근로자의 다핵방향족탄화수소 노출 평가)

  • Joo, Kui Don;Kim, Eun A;Choi, Seong Bong;Kim, Myeong Ock
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.17 no.1
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    • pp.71-80
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    • 2007
  • The purpose of this study was to assess the ambient level of Polynuclear aromatic hydrocarbons(PAHs), oil mist of the metalworking fluids(MWFs), especially in heat treat industry and non heat treat industry. And we assessed the relationship of the pattern of exposed PAHs with oil mist during survey day. The study population of heat treat industries contained 98 workers, non-heat treat industry contained 40 workers. Personal samples were taken for ambient monitoring of PAHs and oil mist. PAHs was to analyze the relationship of airborne oil mist. The geometric mean of airborne total PAHs was $3.44{\mu}g/m^3$ in heat treat industry and $0.13{\mu}g/m^3$ in non heat treat industry, Pyrene and Benzo(a)pyrene was detected from heat treat industry and Naphthalene in heat treat industry was significantly detected higher than in non heat treat industry. The geometric mean of airborne oil mist was $0.19{\mu}g/m^3$ in heat treat industry and $0.70{\mu}g/m^3$ in non-heat treat industry. The correlation between oil mist and total PAHs was shown below, total PAHs in workers of non heat treat industry and heat treat industry were not significantly correlated with oil mist

Development of an Oil Mist Collector Equipped with Centrifugal De-oiling System (원심력 필터 재생기능을 갖춘 오일 미스트 여과 집진장치 개발)

  • Kim, Tae-Hyeung;Seo, Jeoung-Yoon;Ha, Hyun-Chul;Kim, Jong-Cheul;Cho, Jin-Ho
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.15 no.3
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    • pp.166-175
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    • 2005
  • Health effects associated with metal working fluid (MWF) exposures include dermatitis, respiratory disease, hypersensitive pneumonitis, and asthma. Frequently, occupational exposures to MWFs are controlled by ventilating an enclosure with an air cleaning unit that includes a fan preceded by various kinds of filtration. There are several kinds of air cleaning units used in machining centers. But the associated troubles have hindered from efficiently using these devices. The main problem is the relatively short period of filter replacement. The reason is that the air cleaning units usually do not have the de-oiling systems, thus leading the earlier clogging of filters and reducing the flow rate of hood. Thus, the first stage of study was conducted to overcome this problem by developing the new oil mist collector equipped with the easy de-oiling system. The principle of de-oiling is that the centrifugal force generated by spinning the drum covered by filter fabric separates oils from the filter fabric. It would be very similar to the spin-dry laundry. By adopting this de-oiling technique, the problems associated with the conventional oil mist collectors could be solved. Several tests/analyses were performed to make the lab-scale oil mist collector. The collection efficiencies and the de-oiling efficiencies of commercially available filter fabrics were tested. Subsequently, the endurance test were conducted by observing SEM photos of filter fabrics and measuring tensile strength/expansion coefficient after spinning the filter drum for 20 minutes at the different rotation speeds. By doing these experiments, the most appropriate filter fabric and rotation speed/duration were selected. Finally, the new oil mist collector was designed. In the near future, this device must be tested in the real machining center.

Numerical Analysis of Flow Characteristics of the Filter for Separating Oil Mist from Blow-by Gas (블로바이 가스 내 오일입자들을 제거하기 위한 필터의 유동특성 수치해석)

  • Yun, Jeong-Eui;Chae, Kangseog;Kang, Hyukjin;Chung, Doyoung
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.5
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    • pp.549-555
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    • 2016
  • This research was performed to determine the oil separation characteristics of the specially designed oil filter installed in a PCV cylinder head passage. The oil filter was specially designed with fleece for separating oil mist from blow-by gas. The fleece, made of fiber fabric material, is placed in the oil filter case to absorb oil mist with a small pressure drop during blow-by gas through the filter. To do this, 3-D CFD analysis was simulated for the simplified PCV system with the oil filter using the commercial code, Ansys CFX. Results showed that the oil filter's efficiency with fleece sharply increased as oil droplet size increased.