• Title, Summary, Keyword: Inlet Part

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Separation characteristics of separation devices using inlet water mixed with exhalation gases without a compressor (날숨이 혼합된 물을 사용한 압축기없는 용존기체 분리기의 분리 특성)

  • Heo, Pil Woo
    • Journal of the Korean Society of Marine Engineering
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    • v.40 no.9
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    • pp.842-846
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    • 2016
  • It's possible for a human to breathe under water, but the amount of dissolved oxygen in the water is small and a large amount of water is necessary to obtain sufficient dissolved oxygen from water. So, large separation system with large water pumps, having large surface areas, and large battery sources are needed. Exhalation gases are used to solve this problem. Theses gases contain some oxygen, nitrogen, and carbon dioxide; they contain less oxygen and more carbon dioxide compared to air. Therefore, reduction of the amount of carbon dioxide is necessary. If exhalation gases are employed appropriately, the separation device can be made more compact. Inlet water mixed with exhalation gases is supplied into the separation device, and dissolved gases are separated from the mixed water as it passes through the device. The inlet part of a typical separation system with a water delivery pump before the membrane module has more than one atmosphere. Hence, a compressor is used to mix the exhalation gases. In this study, the pressure at the inlet due to the use of a suction pump after the membrane module was less than one atmosphere; hence, compressors were not required. Separation characteristics were studied using a separation device without a compressor. The use of exhalation gases led to an increase in the amount of dissolved gases being separated. As the amount of inlet exhalation gases was increased, the separation of dissolved gases was increased as well.

Distribution of Air-Water Two-Phase Flow in a Header of Aluminum Flat Tube Evaporator (알루미늄 평판관 증발기 헤더 내 공기-물 2상류 분지 실험)

  • Kim Nae-Hyun;Shin Tae-Ryong;Sim Yong-Sup
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.18 no.1
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    • pp.55-65
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    • 2006
  • The air and water flow distribution are experimentally studied for a round header - flat tube geometry simulating a parallel flow heat exchanger. The number of branch flat tube is thirty. The effects of tube outlet direction, tube protrusion depth as well as mass flux, and quality are investigated. The flow at the header inlet is identified as annular. For the downward flow configuration, the water flow distribution is significantly affected by the tube protrusion depth. For flush-mounted configuration, most of the water flows through frontal part of the header. As the protrusion depth increases, more water is forced to the rear part of the header. The effect of mass flux or quality is qualitatively the same as that of the protrusion depth. Increase of the mass flux or quality forces the water to rear part of the header. For the upward flow configuration, however, most of the water flows through rear part of the header. The protrusion depth, mass flux, or quality does not significantly alter the flow pattern. Possible explanations are provided based on the flow visualization results. Negligible difference on the water flow distribution was observed between the parallel and the reverse flow configuration.

Development of Chromatographic Downstream Processing for the Purification of Monoclonal Antibody from Ascites Fluid: Part II Use of Single Hydroxylapatite Chromatographic Step (생쥐 복수로부터의 단세포군 항체분리를 위한 크로마토그라피 분리정제 방법의 개발 Part II. 히드록실아파타이트 크로마토그라피 단일 단계만의 사용)

  • Ahn, I.S.;Park, C.Y.
    • Microbiology and Biotechnology Letters
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    • v.17 no.3
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    • pp.269-272
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    • 1989
  • In order to obtain monoclonal antibody from ascites fluid at sufficiently high purity using a single hydroxylapatite chromatography (HA) a further optimization on its operating variables was carried out. By adjusting the pH of the eluent, the sodium phosphate buffer, to 6.0 from 6.8 and adding CaCl$_2$to 1 mM at the column inlet, the elution molarities (M$_{elu}$) for the desired monoclonal antibody and contaminating proteins can be distinguished from each other with enough resolution. Previously these two groups of proteins co-eluted at the same time at pH 6.8 and without CaCl$_2$. This sin81e step hydroxylapatite chromatography yields the desired antibody pure enough for diagnostic use.

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The Characteristic of Friction-Factor on Honeycomb Surfaces (Part I : Experimantal Tests and Friction-Factor Modeling) (허니콤 표면의 마찰계수 특성에 관한 연구 (Part 1 : 표면 마찰계수 측정 및 모델링))

  • 하태웅
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.6
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    • pp.1430-1438
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    • 1994
  • Friction-factors for honeycomb surfaces are measured with a flat plate tester. The flat plate test apparatus is described and method is discussed for determining the friction-factor experimentally. The friction-factor is calculated for the flat plate test based on the Fanno-line flow. The test parameters are honeycomb cell width, depth, clearance, inlet pressure, and Reynolds number(or Mach number). A new empirical friction-factor model for honeycomb surfaces are developed as a function of these parameters.

Hydrogen Absorption Behavior of Zr-2.5Nb Pressure Tubes in Wolsong Unit 1

  • Choo, Kee-Nam;Kwon, Sang-Chul;Kim, Young-Suk
    • Nuclear Engineering and Technology
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    • v.30 no.4
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    • pp.318-327
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    • 1998
  • The deuterium uptake behavior of Zr-2.5Nb pressure tubes in Wolsong Unit 1 was analyzed in terms of longitudinal location, operation time, and coolant temperature. The results were compared with those obtained from Canadian CANDU reactors. The amount of deuterium uptake was higher at the outlet part than at the inlet part and was also higher when subjected to a longer operation time and a higher coolant temperature. The hydrogen uptake of Zr-2.5Nb in a hydrogen gas atmosphere was dependent on the microstructure of the alloy. The aged Zr-2.5Nb consisting of $\alpha$-Zr and $\beta$-Nb phases showed higher hydrogen uptake than that consisting of $\alpha$-Zr and $\beta$-Zr phases. The hydrogen in the alloy decreased the rate of oxidation. This could be explained in terms of the cathodic controlled reaction of Zr-2.5Nb oxidation.

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Study on problems of the farmland and water management on the large scale plots (대구획 논의 경지기반 및 물관리 실태조사 분석)

  • Jeon, Jong-Gil;Lee, Sang-Bong;Yun, Jin-Ha;Gang, Chang-Ho
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • pp.215-218
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    • 2005
  • This study was carried out to find problems of the farmland according to the large scale land consolidation projects. Field ramp have problems such as steep slope, narrow width and the difficulty of entering into field and exiting from it. In case of the even ratio of the paddy plot, It showed that the difference of the maximum average level were 8.4cm for the general plots($0.3{\sim}0.4ha$), 12.6cm for the large scale plots($0.8{\sim}1.0ha$), and the level of outlet part was higher than the level of inlet part in some plots. Also, most of presently using inlets are closed and opened manually. It showed that farmers had difficult in the operating of the inlets or the outlets. So it is required the development of the suitable inlets and the suitable outlets.

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A New Model for Predicting Width Spread in a Roughing Mill - Part I: Application to Dog-bone Shaped Inlet Cross (조압연 공정의 판 폭 퍼짐 예측 모델 - Part I : 도그 본 형상에 적용)

  • Lee, D.H.;Lee, K.B.;Hwang, S.M.
    • Transactions of Materials Processing
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    • v.23 no.3
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    • pp.139-144
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    • 2014
  • In the current study, we present a new model for predicting width spread of a slab with a dog-bone shaped cross section during rolling in the roughing train of a hot strip mill. The approach is based on the extremum principle for a rigid plastic material and a three dimensional admissible velocity field. The upper bound theorem is used for calculating the width spread of the slab. The prediction accuracy of the proposed model is examined through comparison with the predictions from 3-D finite element (FE) process simulations.

Operating Characteristics Study of a Small Gas/Steam Turbine Combined System Using Biogas (바이오가스 연료를 사용하는 소형 가스/증기터빈 복합 발전 시스템의 성능특성 해석)

  • Kang, Do-Won;Shin, Hyun-Dong;Kim, Tong-Seop;Hur, Kwang-Beom;Park, Jung-Keuk
    • The KSFM Journal of Fluid Machinery
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    • v.15 no.3
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    • pp.51-56
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    • 2012
  • This study analyzed the influence of firing biogas on the performance and operation of a gas/steam turbine combined system. A reference gas/steam turbine combined system, designed with biogas fuel(57% volumetric methane) was set up and off-design simulation was made to investigate operating characteristics when a couple of operating schemes to mitigate turbine blade overheating were applied. Performance at base-load operation using each scheme was compared and part load operation using the variable inlet guide vane was analysed. Also, differences in operating characteristics and performance caused by changes in the methane content of biogas and ambient temperature were examined.

Performance Simulation of a Turboprop Engine for Basic Trainer

  • Kong, Changduk;Ki, Jayoung;Chung, Sukchoo
    • Journal of Mechanical Science and Technology
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    • v.16 no.6
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    • pp.839-850
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    • 2002
  • A performance simulation program for the turboprop engine (PT6A-62), which is the power plant of the first Korean indigenous basic trainer KT-1, was developed for performance prediction, development of an EHMS (Engine Health Monitoring System) and the flight simulator. Characteristics of components including compressors, turbines, power turbines and the constant speed propeller were required for the steady state and transient performance analysis with on and off design point analysis. In most cases, these were substituted for what scaled from similar engine components'characteristics with the scaling law. The developed program was evaluated with the performance data provided by the engine manufacturer and with analysis results of GASTURB program, which is well known for the performance simulation of gas turbines. Performance parameters such as mass flow rate, compressor pressure ratio, fuel flow rate, specific fuel consumption and turbine inlet temperature were discussed to evaluate validity of the developed program at various cases. The first case was the sea level static standard condition and other cases were considered with various altitudes, flight velocities and part loads with the range between idle and 105% rotational speed of the gas generator. In the transient analysis, the Continuity of Mass Flow Method was utilized under the condition that mass stored between components is ignored and the flow compatibility is satisfied, and the Modified Euler Method was used for integration of the surplus torque. The transient performance analysis for various fuel schedules was performed. When the fuel step increase was considered, the overshoot of the turbine inlet temperature occurred. However, in case of ramp increase of the fuel longer than step increase of the fuel, the overshoot of the turbine inlet temperature was effectively reduced.

An Experimental Study for the Improvement of Ventilation Conditions and Effectiveness in the Manufacturing Industry by Increasing the Mixing Factor (K-Factor) (혼합계수(K-Factor) 증가에 따른 사업장의 환기 조건 및 효율 개선에 관한 연구)

  • Lee, Yun-ho;Lee, Seokwon;Lee, Kyoungho;Kim, Hyunwook
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.29 no.3
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    • pp.343-350
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    • 2019
  • Objectives: This study aims to identify whether ventilation conditions and their effectiveness can be significantly improved in an experimental chamber by increasing the mixing factor (K-Factor). Methods: In a chamber with a volume of $1m^3$, air velocity was measured at six different points with four roof fans in the upper part of the chamber being operated in order. The impact of the ventilation conditions was analyzed when the flow rates were increasing and the first inlet of the chamber was either open or closed. Smoke patterns were also observed at four corner points where ventilation was limited. Kruskal Wallis and Mann-Whitney tests were performed to compare air velocities measured in the chamber. Results: The air velocities measured at only the third point increased significantly from $0.03{\pm}0.03m/s$ (door open) and $0.05{\pm}0.06m/s$ (door closed) with two fans, $0.08{\pm}0.08m/s$ with three fans, and $0.09{\pm}0.09m/s$ with four fans operating (p<0.05). However, air velocities at the four corner points did not significantly increase. Smoke patters also showed that the open inlet of the chamber had no effect on improvement of ventilation conditions and effectiveness. Conclusions: In this study, the air velocities at six points in the chamber did not significantly increase despite the increase in the mixing factor and flow rates of ventilation in the controlled environment. Therefore, the inflow of outdoor air throughout an open inlet and installation of a forced ventilation system can potentially increase the indoor air velocity and improve ventilation condition without an increase in the mixing factor.