• 제목/요약/키워드: LIM Pump

검색결과 271건 처리시간 0.036초

MHD 기기의 전자기적 특성 고찰 (Electromagnetic Characteristics of MHD Machine)

  • 장석명;김형규
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 하계학술대회 논문집 A
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    • pp.266-268
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    • 1998
  • The linear MHD(magnetohydro-dynamic) machine obtains the linear motion by replacing the solid conducting secondary of LIM with the ionized gas, plasma or the liquid metal. The electromagnetic pump which is a kind of MHD machine is divided into induction pump and conduction pump. This paper shows the classification and development trends of MHD machines and the characteristics of double sided flat linear induction pump (DFLIP).

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진행파 여진에 의한 굴곡 신축진동을 이용하는 압전 펌프 (A piezoelectric pump using extensional vibration of lateral surface by traveling wave)

  • 오진헌;임기조
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2010년도 하계학술대회 논문집
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    • pp.322-322
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    • 2010
  • In this paper, we propose a novel type valveless micro-pump that uses extensional vibration mode of traveling wave as a volume transporting means for solving some problems about check valves, essential parts of usual pumps. The proposed pump consists of two piezoelectric ceramic rings and a metal body located in the middle of them respectively. Because the drift of bended surface that results from the traveling wave excitation controls the fluid flow, check valves are not needed in this pump model. In accordance with the variation of the pump body dimension, we analyzed the vibration displacement characteristics of pump model, determined the optimal design condition, fabricated the prototype pump from the analysis results and evaluated its efficiency.

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다중 흡수정을 갖는 펌프장 모델의 유동균일성 해석 (Numerical Analysis on the Flow Uniformity in a Pump Sump Model with Multi Pump Intake)

  • 최종웅;최영도;임우섭;이영호
    • 한국유체기계학회 논문집
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    • 제12권4호
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    • pp.14-22
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    • 2009
  • The head-capacity curves for pumps developed by the pump manufacturer are based on tests of a single pump operating in a semi-infinite basin with no close walls or floors and with no stray currents. Therefore, flow into the pump intake is with no vortices or swirling. However, pump station designers relying on these curves to define the operating conditions for the pump selected sometimes meet the reductions of capacity and efficiency, as well as the increase of vibration and additional noise, which were caused by air-entered flow in the pump station. From this background, the authors are carrying out a systematic study on the flow characteristics of intakes within a sump of pump station model. Multi-intake sump model with anti-submerged vortex device basin is designed and the characteristics of submerged vortex is investigated in the flow field by numerical simulation. In this study, a commercial CFD code is used to predict the vortex generation in the pump station accurately. The analysed results by CFD show that the vortex structure and effect of anti-submerged vortex device are different at each pump intake channel.

VALVELSS 압전펌프 진동 해석 및 특성 (Vibration analysis of characteristics and valveless Type Piezoelectric micro-pump)

  • 임종남;오진헌;임기조;김현후
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2009년도 하계학술대회 논문집
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    • pp.185-185
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    • 2009
  • Micropump is very useful component in micro/nano fluidics and bioMEMS applications. Using the flexural vibration mode of PZT bar, a piezopump is successfully made. The PZT bar is polarized with thickness direction. The proposed structure for the piezo-pump consists of an input and an output port, piezoelectric ceramic actuator, actuator support, diaphragm. The traveling flexural wave along the bar is obtained by dividing two standing waves which are temporally and spatially phase shifted by 90 degrees from each other. Fluid is drawn into a forming chamber, eventually the forming chamber closes trapping the fluid therein. The finite elements analysis on the proposed pump model is carried out to verify its operation principle and design by the commercial FEM software. Components of piezopump were made, assembled, and tested to validate the concepts of the proposed pump and confirm the simulation results. The performance of the proposed piezopump the highest pressure level of 83.4kHz.

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유전알고리즘을 이용한 전자기 펌프용 선형유도전동기의 최적설계 (Optimum Design of a Linear Induction Motor for Electromagnetic Pump using Genetic Algorithm)

  • 김창업;홍성옥
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2000년도 하계학술대회 논문집 B
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    • pp.744-746
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    • 2000
  • This paper presents an optimum design of a linear induction motor(LIM) using genetic algorithm(GA). Sequential unconstrained minimization technique(SUMT) is used to transform the nonlinear optimization with constraints to a simple unconstrained problem. The objective functions of LIM such as trust, weight are optimized and the result was applied to the design of linear induction pump.

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DME를 연료로 하는 고압펌프의 성능 및 내열 특성 평가 (Performance and Thermal Endurance Tests of a High Pressure Pump Fueled with DME)

  • 백범기;임옥택
    • 한국수소및신에너지학회논문집
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    • 제31권1호
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    • pp.89-95
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    • 2020
  • The main scope of this paper is to see if the conventional pump can be properly used for a specific fuel, Di-methyl Ether (DME) despite of its low lubricity and high reactivity in the experimental conditions. A wobble plate type fuel pump was connected to the common rail to verify that the pump could deliver the fuel at the required pressure and resultantly DME could be used as fuel without modifying the original pump. At each required pressure (30 Mpa, 35 Mpa, 40 Mpa, 45 Mpa, and 50 Mpa), the pump met the pressure required by the common rail. In addition, pump performance experiments tended to follow the usual performance curve while the flow rate decreased as the pressure increased. The maximum flow rate of the pump was 470 kg/h at 30 Mpa and all measurements were taken with keeping DME temperature below 60℃.

Design of a Valveless Type Piezoelectric Pump for Micro-Fluid Devices

  • Kim, Hyun-Hoo;Oh, Jin-Heon;Yoon, Jae-Hun;Jeong, Eui-Hwan;Lim, Kee-Joe
    • Transactions on Electrical and Electronic Materials
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    • 제11권2호
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    • pp.65-68
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    • 2010
  • The operation principle of a traveling wave rotary type ultrasonic motor can be successfully applied to the fluidic transfer mechanism of the micro-pump. This paper proposes an innovative valveless micro-pump type that uses an extensional vibration mode of a traveling wave as a volume transportation means. The proposed pump consists of coaxial cylindrical shells that join the piezoelectric ceramic ring and metal body, respectively. In order to confirm the actuation mechanism of the proposed pump model, a numerical simulation analysis was implemented. In accordance with the variations in the exciting wave mode and pump body dimension, we analyzed the vibration displacement characteristics of the proposed model, determined the optimal design condition, fabricated the prototype pump from the analysis results and evaluated its performance. The maximum flow rate was approximately $595\;{\mu}L/min$ and the highest back pressure was 0.88 kPa at an input voltage of $130\;V_{rms}$. We confirmed that the peristaltic motion of the piezoelectric actuator was effectively applied to the fluid transfer mechanism of the valveless type micro pump throughout this research.

A Multi-Stage CMOS Charge Pump for Low-Voltage Memories

  • Lim, Gyu-Ho;Yoo, Sung-Han;Kim, Young-Hee
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 2002년도 춘계종합학술대회
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    • pp.283-287
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    • 2002
  • To remedy both the degradation and saturation of the output voltages in the modified Dickson pump. a new multi-stage charge pump circuit is presented in this paper. Here using PMOS charge-transfer switches instead of NMOS ones eliminates the necessity of diode-configured output stage in the modified-Dickson pump, achieving the improved voltage pumping gain and its output voltages proportional to the stage numbers. Measurement indicates that VOUT/3VDD of this new pump circuit with two stages reaches to a value as high as 0.94 even with low VDD=1.0 V, strongly addressing that this scheme is very favorable at low-voltage memory applications.

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밸브레스 연동(連動) 압전펌프의 설계 및 특성 (Design of valveless type peristaltic micro-pump)

  • 오진헌;정의환;임종남;임기조;송재성
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 제40회 하계학술대회
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    • pp.1301_1302
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    • 2009
  • Recently, there has been increased incessantly an interest in research area on micro-fluidic pump for electronic and biological applications. The proposed pump takes an unobtrusive operation into the simple displacing mechanism using peristaltic traveling waves without the physical moving valves. And, this piezopump makes up a panel type design. The ATILA simulation was performed to estimate the operating frequency of the vibrating wave mode, to optimize the design conditions of piezopump such as structure, elastic body material, piezoelectric ceramics, and to analyze the distribution of vibration displacement. The best measured value of the pumping rate is about $118{\mu}l$/min under the following parameters : 4-wave mode, 50kHz operating frequency, $200V_p$.

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워터펌트 내에 있는 임펠러의 침식.부식에 관한 연구 (Study on the erosion-corrosion damages of pump impeller)

  • 김재욱;임희창;임우조
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2007년도 춘계학술대회A
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    • pp.102-107
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    • 2007
  • The steel impeller placed in a water pump has been studied with the aim to understand corrosion phenomena on the surface responsible for reducing the pumping efficiency of water inside cooling system. This preliminary experiment includes a period (around 1 month) observation with a powered microscope and weight measurements. The experiments are carried out at different conditions of water and mixtures of water and coolants, based on the water contents of 25%, 50%, 75%, and 100% water (pure tap water). From the visual results of microscopy, most of the steel surface is fitted and clear rusty or corrosion phenomena are noticeable as time goes. In addition, the weight loss of the sample specimen submerged in the water is linearly increased, whereas those in the mixtures of water initially gain weight and become almost constant.

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