• Title/Summary/Keyword: phase separator

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Study on the Effect of Design Parameters of the Vane Type Inertial Separator Using Commercial CFD Code (상용 CFD 프로그램을 사용한 베인형 관성분리기의 설계인자 영향 검토)

  • Lee, Dap-Yeon;Lew, Jae-Moon
    • Journal of the Society of Naval Architects of Korea
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    • v.54 no.6
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    • pp.470-475
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    • 2017
  • Since the intake air of gas turbine engine of marine purpose contains water particles, inertial separator for separating the air and water particles are provided. Saw type and wave type separator are now used to separate inflow water particle from the gas. In this paper, the design parameters of saw type separator are studied by numerical simulations. Using the commercial CFD program, Star-CCM+, Lagrangian-Eulerian method was used to perform the analysis of two phase flow of the mist in the air. This method solves Reynolds-Averaged Navier-Stokes equations in Eulerian framework for the continuous phase, while solves equation of motion for individual particles in Lagrangian framework. Lagrangian multiphase method was applied to monitor the particles of different sizes and shapes and to verify collision between particles by chasing particles. Water particles were injected through injectors located at the inlet of the separator and escape mode was used which assumes that the particles attached on the surface of inertial separator were removed from the simulation, effectively escaping the solution domain. Through the numerical computations with the inlet condition of constant water particle size in the wetness fraction of 85%, efficiency of eliminating the water particle and the pressure drop between the inlet and outlet were examined.

A Study on the Gas-liquid Multiphase Flow Characteristics of the In-line Type Separator (In-line형 세퍼레이터의 기-액 다상유동 특성에 관한 연구)

  • Sang-Mok Han;Young-Ju Kim;Nam-Sub Woo;Wang-Do Lee;Hae-Jin Jo
    • Journal of the Korean Society of Industry Convergence
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    • v.26 no.5
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    • pp.803-812
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    • 2023
  • The subsea separator of an offshore plant for offshore oil and gas development performs the process of separating oil and gas from crude oil produced in the subsea. The oil-gas subsea separator can be divided into a gravity type that separates fluids by gravity and an in-line type that separates fluids using centrifugal force of density. In the case of the deep sea, the development of a small in-line type separator is required due to manufacturing cost and safety problems caused by water pressure. Therefore, in this study, the gas-liquid phase separation efficiency of the subsea separator was identified through the study of the multiphase flow characteristics of the in-line type separator. For the optimal design of the in-line type separator, the shape of the internal swirl element(ISE) was selected first, and the separation efficiency results for each section of the in-line type separator were analyzed. This study was conducted in parallel with experiments and numerical analysis, and it is expected that the reliability and efficiency of the in-line type separator will be improved through the results.

Development of the Continuous and Instantaneous Light liquid-Heavy liquid Centrifugal Separator using Density Difference (밀도 차를 이용한 경액과 중액의 연속 순간 원심분리기 개발)

  • 김영환;윤지섭;정재후;홍동희;박기용
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.655-659
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    • 2001
  • Resident time of the continuous and Instantaneous centrifugal separator using that separates the light and heavy liquids by use of density difference is the orptical factor that affects significantly the chemical metial extraction and the productivity in the chemical and mechanical process. In this paper, the overflow of the device is investigated under consideration of the relationships between inclination angle of liquid feeding screw and the centrifugal force. From the design of the length of a centrifugal separator, the radiuses of rotor and housing, theoretical formulation on the contact radius of separation weir is established through the experiments. From the experiments, it is identified that how much the capacity of inlet impeller and the emulsion phenomenon depend on the screw angle of inlet impeller. Also, we investigate the separation condition and the resident times that are functions of the phase ratio and density.

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Development of centrifugal extractor for organic phase extraction using a height controlled separation weir and a divert plate (분리 웨어의 상하 조절과 전형판을 이용한 유기상 원심추출기 개발)

  • 김영환;윤지섭;정재후;홍동희;박기용
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.515-518
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    • 1997
  • Resident time of the centrifugal extractor for organic phase extraction using a height controlled separator weir and a divert plate is the important factor that affects significantly the chemical material extraction and the productivity in the chemical and mechanical processes. In this paper, it describes the design of the device for extraction of an organic phase from radioactive wastes, and considers phase separating weir and divert disk, both being designed to be adjustable in their positions, for effectively separating an organic phase. A height-adjustable separating weir unit used for separating the organic phase from the aqueous phase using a phase separating weir and designed to control the height of the separating weir as desired so as to allow the weir to be positioned at a boundary layer between two separated phases. The centrifugal extractor controls satisfactorily the mixed reaction time of two phases within the separator regardless of the variations of the mixing ratio of the two phases and the rotating speed of the extractor, is designed to be adjustable in its position in the vertical direction, thus allowing the user to appropriately select the mixed reaction time of the two phases within the extractor as desired. From development of a centrifugal extractor, it can effectively recover such usable elements, and preferably reducing the output quantity of radioactive wastes.

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A Study on the Characteristics of Refrigeration System Installed with Precooler, and Liquid-Vapor Separator after Expansion Device (과냉각기와 팽창장치 후 액기분리기를 적용한 냉동시스템 성능특성 연구)

  • Yun, Sang-Kook
    • Journal of Advanced Marine Engineering and Technology
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    • v.35 no.1
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    • pp.40-45
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    • 2011
  • The purpose of research is to understand the characteristics of refrigeration system having a liquid-vapor phase separator after expansion device and precooling heat exchanger. After expansion process of typical refrigerant of freezer, R134a, the cold vapor of the expanded refrigerant mixture is separated in the liquid-vapor separator and introduced in the precooling heat exchanger to enable the liquid refrigerant to be subcooled. The analysis results showed that the increasing rate of refrigeration capacity and COP can be 8.6% and 1.4%, each. The cause of these performance improvements is due to the difference of the slope of saturated vapor and saturated liquid lines in Mollier diagram of refrigerant.

Redesign and Evaluation of a Chickpea Harvester

  • Golpira, H.
    • Journal of Biosystems Engineering
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    • v.40 no.2
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    • pp.102-109
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    • 2015
  • Purpose: Slow manual harvesting of rain-fed chickpeas cultivated in fallow fields in developing countries have encouraged the design of a mechanical harvester. Methods: A tractor-pulled harvester was built, in which a modified stripper header detached pods from an anchored plant and a chain conveyor transferred material. The stripper harvester was redesigned to use: 1) the maneuverability of tractor-mounted frames, 2) the adaptability of floating headers, and 3) the flexibility of pneumatic conveyors. Results: A mobile vacuum conveyor, which was an innovator open system, was designed for the dilute phase transferring mode for both grain and material other than grain. A centrifugal fan transferred harvested material to a cyclone separator that settled harvested material in a grain tank 1 m high. The machine at the spot work rate of $0.42ha{\cdot}h^{-1}$ harvested chickpea pods equal to the output of 16.6 farm laborers. Conclusion: The low cost and reasonable projected purchase price are the advantages of the concept. Additionally, the shattering loss reduction confirms the feasibility of the prototype chickpea harvester for commercialization.

Preparation and Analysis of Cu Nanopowder by Wire Explosion in Distilled Water (증류수 중 전기폭발에 의한 Cu 나노분말 제조 및 분석)

  • Cho, Chu-Hyun;Jin, Yun-Sik;Kang, Chung-Il;Lee, Gyung-Ja;Rhee, Chang-Kyu
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.7
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    • pp.1272-1275
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    • 2010
  • The Cu powder was prepared in distilled water. It has a wide range of size distribution. The submicron-sized particles in the Cu powder were removed by using continuous type centrifugal separator. The average particle size after classification was approximately 50nm. The XRD analysis showed that pure Cu phase and oxide phase ($Cu_2O$)weremixedinthepowderpreparedbythismethod.

Evaluation of removal performance of a novel two-stage cylinder type cyclone against water and oil droplets (2단 실린더형 싸이클론의 물 및 오일 액적 제거 성능 분석 연구)

  • Kim, Sumin;Kim, Hak-Joon;Kim, Myungjoon;Han, Bangwoo;Woo, Chang Gyu;Kim, Yong-Jin
    • Particle and aerosol research
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    • v.13 no.3
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    • pp.119-125
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    • 2017
  • A novel two stage cylindrical cyclone was developed for a 3 phase separator in shale oil production industry. The cyclone performance was compared with a cone type cyclone and multi cyclone at the same experimental condition using water and oil mists generated by a humidifier and atomizer at the flow rate 1 to $2m^3/min$. The removal efficiency of total suspended water droplets by the novel cyclone, calculated using inlet and outlet concentrations measured by an optical particle counter, was 99% which is higher than 90% of oil droplet removal efficiency at $2m^3/min$. It might be due to the evaporation of small water droplets during the tests. The water and oil droplet removal performance of the novel cyclone based on the quality factor which is a function of pressure drop and removal efficiency was the highest among three cyclones. The results indicate that the cyclone could be an economical device to remove water and oil mists from shale gas generation processes where a huge three phase separator is commonly used.

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.

Preparation of Porous Separators for Zn Air Batteries Through Phase Inversions of Polyethersulfone-PVP Solutions (Polyethersulfone-PVP 용액의 상전이를 통한 아연공기전지의 다공성 분리막 제조)

  • Cho, Yu Song;Koo, Ja-Kyung
    • Membrane Journal
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    • v.24 no.1
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    • pp.10-19
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    • 2014
  • Porous flat sheet membranes for separators in Zn air batteries were prepared with polyethersulfone (PES) solutions by immersion precipitation phase inversion method. PES/polyvinylpyrrolidone(PVP)/N-methylpyrrolidone(NMP) mixtures were used for casting solutions and water was used for coagulant. With the separators, Zn air batteries were fabricated. The separators were characterized by means of stress-strain test, impedance test and SEM. The Zn air batteries were tested by current interrupt method (CIM) and galvanostatic discharge method. The tensile strength increased with increasing PES content in the casting solution while the ionic conductivity decreased. On the other hand, the ionic conductivity increased while the tensile strength decreased with increasing PVP content. The effect of ionic conductivity trend of the separator in the Zn air battery was confirmed through current interrupt method and galvanostatic discharge method experiments. The battery with the separator from casting solution with higher PES content showed higher IR drop and lower discharge capacity. And the battery with the separator from casting solution with higher PVP content showed lower IR drop and higher discharge capacity.