• Title/Summary/Keyword: 무밸브 펌프

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Simulation of Valveless Pump Using Pumping Chamber Connected to Elastic Tube (탄성 튜브가 연결된 펌핑 챔버를 이용한 무밸브 펌프의 수치해석)

  • Shin, Soo Jai;Chang, Cheong Bong;Sung, Hyung Jin
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.37 no.2
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    • pp.111-117
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    • 2013
  • A valveless pump consisting of a pumping chamber with an elastic tube was simulated using an immersed boundary method. The interaction between the motion of the elastic tube and the pumping chamber generated a net flow toward the outlet through a full cycle of the pump. The net flow rate of the valveless pump was examined by varying the stretching coefficient, bending coefficient, and aspect ratio of the elastic tube. Photographs of the fluid velocity vectors and the wave motions of the elastic tube were examined over one cycle of the pump to gain a better understanding of the mechanism underlying the valveless pump. The relationship between the gap in the elastic tube and the average flow rate of the pump was analyzed.

Development of Micropump using Circular Lightweitht Piezo-composite Actuator (원형 경량 압전 복합재료 작동기를 이용한 마이크로 펌프의 개발)

  • 구옌탄텅;구남서
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.34 no.6
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    • pp.35-41
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    • 2006
  • In this paper, we focus on improving the performance of the piezoelectric diaphragms of valveless micropumps. A circular lightweight piezoelectric composite actuator (LIPCA) with a high level of displacement and output force has been developed for piezoelectrically actuated micropumps. We used numerical and experimental methods to analyze the characteristics of the actuator to select optimal design. With the developed circular LIPCA, we fabricated a valveless micropump by photo-lithography and PDMS molding techniques. The displacement of the diaphragm, the flow rate and the back pressure of the micropump were evaluated and discussed. With a semi-empirical method, the flow rate with respect to driving frequency was predicted and compared with experimental one. The test results confirm that the circular LIPCA is a promising candidate for micropump application and can be used as a substitute for a conventional piezoelectric actuator diaphragm.

Electro-Fluid-Structural Interaction Simulation of a Valveless Micropump (시뮬레이션을 통한 무밸브 마이크로 펌프의 전기-유체-구조 상호작용에 대한 연구)

  • Li, Guang-Zhe;Goo, Nam-Seo;Han, Cheol-Heui
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.36 no.1
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    • pp.7-13
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    • 2008
  • In this paper, the pumping performance of a piezoelectric valveless micropump is simulated with a commercial finite element analysis software, COMSOL Multiphysics. The micropump developed in the previous work is composed of a 4-layer lightweight piezo-composite actuator (LIPCA), a polydimethylsiloxane (PDMS) pump chamber, and two diffusers. The piezoelectric domain, structural domain and fluid domain are coupled in the simulation. Water flow rates are numerically predicted for geometric parameters of the micropump. Based on this study, the micropump is optimally designed to obtain its highest pumping performance.

A Numerical Study on the Flow Characteristics of a Valveless Micropump (무밸브 마이크로 펌프의 유동 특성에 관한 수치해석)

  • Chin, Sang-Mun;Hur, Nahmkeon
    • 유체기계공업학회:학술대회논문집
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    • 2004.12a
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    • pp.748-753
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    • 2004
  • The performance of a valveless micropump driven by chamber wall oscillation was numerically investigated for various frequency and amplitude of the oscillation. The numerical study was performed in the range of oscillation frequency from 200Hz to 1000Hz and amplitude from $1{\mu}m$ to $15{\mu}m$. And optimal values for the parameters are found. At the oscillation frequency 600Hz, the net flow rate of micropump shows a maximum value. Also the results show good agreement with the experimental results. The total flow rate was increased with the oscillation amplitude. However, the net flow rate was found to be decreased over $7{\mu}m$.

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Three Dimensional Electro-Fluid-Structural Interaction Simulation for Pumping Performance Evaluation of a Valveless Micropump (무밸브 마이크로 펌프의 성능평가를 위한 3차원 전기-유체-구조 상호작용 해석)

  • Pham, My;Phan, Van Phuoc;Han, Cheol-Heui;Goo, Nam-Seo
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.37 no.8
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    • pp.744-750
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    • 2009
  • In this study, the pumping performance of a piezoelectric valveless micropump is simulated. The micropump, which was developed in the previous work, is composed of a four-layer lightweight piezocomposite actuator, a polydimethylsiloxane (PDMS) pump chamber, and two diffusers. The piezoelectric domain, the fluid domain and the structural domain are coupled in the three-dimensional simulation. We used ANSYS for the piezoelectric and structural domains and ANSYS CFX for the fluid domain. The effects of driven frequency on the flow rate have been investigated by simulating the flow characteristics for 10 Hz and 40 Hz driven frequencies. The flow rates with respect to driven frequencies up to 300 Hz have been calculated.

Plate Type New Distributor Development for Hydraulic Motors and Pumps (유압모터 및 펌프용 판 형태의 새로운 분배기 개발)

  • Jin, Seong-Mu;Kim, Hyeong-Ui
    • 한국기계연구소 소보
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    • s.18
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    • pp.75-85
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    • 1988
  • The distributor for hydraulic pumps or motors, particularly radial piston motors, include rotary member which has equally both surface shape for dynamic balance and two fixed members, located in both side of rotary member, which have equal surface shape for dynamic balance and circular ring which use to retain predetermined clearance between two fixed members. Rotary member must have valve part for flow-distribution and can have hydrostatic bearing for excellently dynamic balance. At least two annular steps located on said pressure plate which use in compensation of bolt expansion.

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On the Performance Test of the Piezoelectric-Hydraulic Pump (압전유압펌프 성능실험에 대한 연구)

  • Joo, Yong-Hwi;Hwang, Jai-Hyuk;Yang, Ji-Youn;Bae, Jae-Sung;Lee, Jong-Hoon;Kwon, Jun-Yong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.43 no.9
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    • pp.822-829
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    • 2015
  • In this paper, the piezoelectric-hydraulic pump with a piezostack actuator as a driving source has been designed, fabricated, and evaluated for its application to UAV's brake system. The performance requirements of the piezoelectric-hydraulic pump were decided based on the requirements analysis of the target aircraft brake system. The geometric design of the piezoelectric-hydraulic pump to meet the performance requirements of the pump was conducted, and all components of the pump including the spring sheet type check valves were machined with close tolerance. By constructing a test apparatus for the performance check of the piezoelectric-hydraulic pump, the performance characteristics of the pump, such as the outlet flow rate for load-free condition and the outlet oil pressure for closed loop condition, have been evaluated. It has been found by the performance test result that the developed piezoelectric-hydraulic pump satisfies the design requirements effectively.

Characterization of Bi-directionally Oscillating Microflow and Flow Rectification Performance of Microdiffusers (마이크로 디퓨저 내의 양 방향 동적 유동과 펌프 구동 주파수에 따른 유동정류 특성 연구)

  • Lee, Yeong-Ho;Gang, Tae-Gu;Jo, Yeong-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.2
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    • pp.291-299
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    • 2002
  • This paper characterizes hi-directionally oscillating flow in planar microdiffusers in order to evaluate the frequency-dependent flow rectification performance of the microdiffusers. In the theoretical study, we analyze a hi-directionally oscillating flow in the planar microdiffuser. In the experimental study, we fabricate two different microdiffuser prototypes, having different neck widths of 100 ㎛ (D100) and 300 ㎛(D300), respectively. The experimental net flow rates are measured as 116.6 $\mu$ι/min. and 344.4 $\mu$ι/min. for D100 and D300, respectively. The experimental flow rate of D300 decreases at the oscillating flow frequencies higher than 90Hz, at which the net boundary layer thickness is reduced to the microdiffuser neck width. It is experimentally verified that the flow rectification performance and the net flow rate of the microdiffusers tend to decrease when the boundary layer thickness is smaller than the diffuser neck width.

A Study on Fire Extinguishing Performance of Closed Type Water Mist Nozzles for Ship's Accommodation (선박 거주구역의 방호를 위한 폐쇄형 미분무 노즐의 화재진압성능평가 연구)

  • Kwark, Ji-Hyun;Kim, Young-Han
    • Fire Science and Engineering
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    • v.26 no.1
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    • pp.1-9
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    • 2012
  • Since accommodation, public space and service areas where people stay for all day occupy about 70% of a huge cruise ship, they have to be protected from the fire. International Maritime Organization has resolved that a water mist system should be equipped in this cruise ship according to SOLAS II-2 Reg. 10.6 and FSS code Ch. 7. The water mist system consists of mist nozzles, pressure vessels, section valves and pump unit etc. In particular, the water mist nozzles should be recognized by fire tests in accordance with IMO Res. MSC 265(84). In this study, the fire tests for cabin, corridor, public space and storage area have been conducted to develop the water mist nozzles appropriate to the regulation. Totally 5 types of nozzles were developed and have satisfied the whole performance requirements.