• 제목/요약/키워드: Pumping Rate

검색결과 375건 처리시간 0.028초

먹는샘물 제조업체의 취수량 및 감시정 관리에 관한 고찰 (A Study on the Water Withdrawal Permit Rate and Monitoring Well Management of Bottled Water Manufacturers)

  • 손두기;박승혁;정교철
    • 지질공학
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    • 제29권3호
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    • pp.329-337
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    • 2019
  • 샘물개발허가의 유효기간은 5년이며, 연장허가를 위하여 만료 6개월 전까지 샘물환경영향조사 보고서를 첨부하여 기간 연장을 신청하여야 한다. 제출된 보고서의 심사과정에서 가장 큰 관심은 샘물 취수에 따른 지하수위 강하, 원수 수질분석 및 감시정의 모니터링 결과에 집중된다. 중생대 백악기 지역과 선캠브리아기 변성암 지역에 각각 위치하는 먹는샘물 제조업체의 취수정에 대하여 수중모터펌프의 양수능력과 양수시간을 조절하는 방법으로 수위강하량과의 상관성을 조사하였다. 양수능력을 감소시키는 방법이 매시간 동일하게 양수시간과 회복시간을 조정하는 방법보다 수위강하량을 줄이는데 효과적이었다. 또한 변성암 지역에 설치한 감시정에 대하여 pH센서의 계측자료를 분석한 결과, 설치 후 경과시간에 따라 계속 증가하여 일정한 값에 수렴하는 것으로 조사되어 관리가 어려운 pH항목을 감시정에서 제외하거나 사용자 친화적인 계측방법으로 보완이 필요할 것으로 판단된다.

박막펌핑을 이용한 Nano Fountain-Pen의 유동 특성에 관한 수치적 연구 (Numerical Analysis of the Flow Characteristics in the Nano Fountain-Pen Using Membrane Pumping)

  • 이진형;이영관;이석한;김훈모;김윤제
    • 한국유체기계학회 논문집
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    • 제9권2호
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    • pp.19-24
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    • 2006
  • Nano fountain-pen is a novel device to make the constant patterning in micro process using new designed probe. Fountain-pen nanolithography (FPN) is applied for constant supply of liquid in conjunction of patterns and surface variation in the micro process. In this study, nuo fountain-pen is composed with reservoir, micro channels, tip and scondary chamber. Instead of traditional method only using capillary force, liquid can be definitely and exactly injected with membrane pumping by the repulse force of tip. It is dfficult to perform experiments in the micro range so that we carried out a numerical analysis for internal flow, using a commercial code, FlUENT, The velocity, pressure and flow rate are obtained under laminar, unsteady, three-dimensional incompressible flow with no-slip condition, and results are graphically described.

전자기 저항을 이용한 열공압형 마이크로 펌프에서 통전유체의 유동 및 펌핑 특성에 관한 연구 (On the Flow and Pumping Characteristics of a Thermopneumatic Micropump with Electromagnetic Resistance for Electrically Conducting Fluids)

  • 오세홍;용정권;김창녕
    • 설비공학논문집
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    • 제23권1호
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    • pp.23-31
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    • 2011
  • An analysis has been conducted of the flow characteristics and pumping performance of a thermopneumatic micropump with electrically conducting fluid. In the present study, considered is a thermopneumatic micropump for electrically conducting fluids with electromagnetic resistance alternately exerted at the inlet and outlet by alternately applied magnetic fields. A model of Prescribed Deformation is used for the motion of the membrane. Here, the pumping performance of the micropump and flow characteristics of the electrically conducting fluid are investigated in the range of Hartmann number less than 30. The current numerical study shows that the net flow rate through the micropump is almost proportional to the strength of the applied magnetic field.

피지옴 모델을 이용한 심실의 전기활성시간 분포에 따른 심박출 성능평가 (Estimation of Cardiac Pumping Performance according to the Ventricular Electrical Activation Time Distribution by Using Physiome Model)

  • 김형균;임기무
    • 대한의용생체공학회:의공학회지
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    • 제36권5호
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    • pp.198-203
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    • 2015
  • The purpose of the study is to examine the effects of pacemaker location on cardiac pumping efficacy theoretically. We used a three-dimensional finite element cardiac electromechanical model of canine ventricles with models of the circulatory system. Electrical activation time for normal sinus rhythm and artificial pacing in apex, left ventricular free wall, and right ventricular free wall were obtained from electrophysiological model. We applied the electrical activation time maps to the mechanical contraction model and obtained cardiac mechanical responses such as myocardial contractile ATP consumption, stroke work, stroke volume, ejection fraction, and etc. Among three artificial pacing methods, left ventricle pacing showed best performance in ventricular pumping efficacy.

공기흡입에 의한 스크류식 원심펌프의 양수불능 특성에 관한 연구 (A Study on the Break-down Characteristics of a Screw-type Centrifugal Pump due to Air Entrainment)

  • 김유택
    • 한국유체기계학회 논문집
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    • 제6권3호
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    • pp.58-63
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    • 2003
  • The performance of turbo pump drops rapidly and it gets into break-down when the void fraction reaches above the threshold value because the impeller flow passage is choked up with air bubbles. Phenomenological understanding of break-down and pumping recovery mechanisms under air-water two-phase flow conditions are therefore important for pump designers and essential assignment for researchers. In this paper, we investigated the characteristics of break-down and pumping recovery due to entrained air occurring inside a screw-type centrifugal pump which has a wide flow passage mainly through the findings of suction and discharge pressures, rotational speed, flow rate measurements and visualization.

직결식 변속펌프의 운전 방안에 대한 연구 (A Study on the Operating Characteristics of Variable Speed Pump for In-Line Booster Pumping Station)

  • 박종문;최성일;노형운;서상호;김상균
    • 유체기계공업학회:학술대회논문집
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    • 유체기계공업학회 2001년도 유체기계 연구개발 발표회 논문집
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    • pp.191-196
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    • 2001
  • In the systems with largely pipe head loss, variable speed pumps are generally used because substantial energy saving can be expected from such systems by controlling pump speed and also they offer simpler maintenance and operational ease even in conditions where abrupt changes In flow rate and head can occur. The invertor or the fluid coupling system are mainly adopted to control the rotating speed. In this paper, operating conditions at Migum pressing pump station(5 stage), where the fluid coupling system was the first installed for KOWACO, are investigated and analysed so that information thus gained can be usefully employed in the efficient operation of variable speed pump in new installations of in-line booster pumping station.

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다공성 유리 슬릿 EO펌프 기초 성능 측정 연구 (Study on Basic Performance Test of Electroosmotic Pump with Porous Glass Slit.)

  • 서상태;박철우
    • 한국가시화정보학회:학술대회논문집
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    • 한국가시화정보학회 2007년도 추계학술대회
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    • pp.59-62
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    • 2007
  • The basic concept and preliminary performance results of a miniaturized electroosmotic (EO) pump with diaphragms were included in the present study. The separation of an electroosmotic pumping liquid from a drug using diaphragms is mainly to have a freedom in choosing an electroosmotic pumping liquid and to achieve the optimal drug delivery, and, preferably its precise control. We performed maximum flow rate, maximum pressure, and maximum current measurements with and without diaphragm designs. As a result, the effect of diaphragms on pump performance at the maximum condition is small. However, the presence of diaphragms does not allow indefinite continuous pumping.

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Effect of constraint severity in optimal design of groundwater remediation

  • Ko, Nak-Youl;Lee, Kang-Kun
    • 한국지하수토양환경학회:학술대회논문집
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    • 한국지하수토양환경학회 2003년도 추계학술발표회
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    • pp.217-221
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    • 2003
  • Variation of decision variables for optimal remediation using the pump-and-treat method is examined to estimate the effect of the degree of concentration constraint. Simulation-optimization method using genetic algorithm is applied to minimize the total pumping volume. In total volume minimization strategy, the remediation time increases rapidly prior to significant increase in pumping rates. When the concentration constraint is set severer, the more wells are required and the well on the down-gradient direction from the plume hot-spot gives more efficient remediation performance than that on the hot-spot position. These results show that the more profitable strategy for remediation can be achieved by increasing the required remediation time than raising the pumping rate until the time reaches a certain limitation level. So, the remediation time has to be considered as one of the essential decision variables fer optimal remediation design.

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장주기 변광성의 SiO 메이저 선 세기 변화 연구 : 메이저 펌핑 기작 (INTENSITY VARIATION OF THE SiO MASER LINE OF LONG PERIOD VARIABLES : MASER PUMPING MECHANISM)

  • 김은혁;이상각
    • 천문학논총
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    • 제8권1호
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    • pp.83-104
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    • 1993
  • In principle, both radiation and collision are capable of pumping the SiO masers. In order to check which pumping mechanism is more efficient, we calculated the rate equation for our model including the 3 vibrational slates with 7 rotational states of each vibrational slate. Through solving the radiative transfer equation with the Sovolev approximation, we estimated the line profiles from an expanding envelope for several transitions. It is found that the collision works more efficiently than the radiation for the inversion in excited vibrational stales. However in an expanding envelope model we could not get the strong line intensity as observed one because the population inversion is possible only in a small restricted region. For the enough population inversion to get type observed maser intensity. the number density of SiO and hydrogen molecules should be up to about $2{\times}10^5\;cm^{-3}$ and $1{\times}10^9\;cm^{-3}$, respectively, and the inversion should be occured in the region of no Jess than 11014cm.

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두 대의 펌프가 병렬로 설치되는 계통에서의 유량 특성 (Flow Rate Characteristics of Two Parallel Pumping System)

  • 박용철;지대영;서경우;윤현기;박정근
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2011년 춘계학술대회논문집
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    • pp.579-586
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    • 2011
  • During a reactor normal operation, a primary coolant was designed to remove the fission reaction heat of the reactor. When one pump is failure and the other pump shall supply the cooling water to cool the reduced power, it is necessary to estimate how much flow will be supplied to cool the reactor. We carried a flow net work analysis for two parallel pumping system as based on the piping net work of the primary cooling system in HANARO. As result, it is estimated that the flow of one pump increased than the rated flow of the pump below the cavitation critical flow.

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