• Title/Summary/Keyword: peristaltic motion

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Analysis for the Propulsion with Peristaltic Motion (Peristaltic 운동을 이용한 추진에 대한 연구)

  • 김문찬
    • Journal of the Society of Naval Architects of Korea
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    • v.39 no.4
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    • pp.11-16
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    • 2002
  • Flow mechanism of peristaltic motion is numerically and experimentally investigated to obtain a propulsive force in highly viscous fluid. Computing code for the analysis of the motions is developed with cell-centered unstructured grid scheme. The computed results by the developed code is compared with the experimental results which have been carried out to find out the propulsion mechanism in highly viscous fluid. The computed results shows good correlation with the experimental results and further the propulsive force can be obtained by sinusoidal motion which makes a pressure difference on waving surface. The more computation with variation of Reynolds number and parameters of motion is expected for finding a proper working range.

A Numerical Study on the Flow Characteristics of a Peristaltic Micropump (연동형 마이크로펌프의 유동에 대한 수치해석 연구)

  • Lee, Na-Ri;Lee, Sang-Hyuk;Hur, Nahm-Keon
    • The KSFM Journal of Fluid Machinery
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    • v.12 no.4
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    • pp.37-43
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    • 2009
  • In the present study, the flow characteristics of a peristaltic micropump were numerically analyzed. A channel wall motion of the micropump was simulated using a moving mesh technique. A sine wave pattern was assumed to simulate the peristaltic motion of wall. The present numerical method was verified by comparing the result with the available numerical data. The effects of the operating conditions which include the maximum displacement and frequency of the channel wall and the phase difference between top and bottom walls on the flow characteristics were investigated. From these numerical results, the pressure-flowrate characteristic curve was obtained for various maximum displacement and frequencies.

FLUID MASS STREAMING IN A CHANNEL UNDER STANDING WALLS VIBRATIONS

  • Lee, Kwi-Joo;Shugan, Igor;Kim, Kyoung-Hwa
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2003.10a
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    • pp.171-176
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    • 2003
  • Peristaltic mass transfer of fluid in a channel with standing wall oscillations is analyzed. Averaged nonlinear Navier-Stokes equations of motion are examined for a wide range of Reynolds numbers and external pressure drops. Nonpropogating wall oscillations with relatively big amplitudes essentially increase the liquid flow. Most effective intensifying of mass transfer occurred for low Reynolds numbers.

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Fabrication and Drive Test of a Peristaltic Thermopnumatic PDMS Micropump

  • Jeong Ok Chan;Park Sin Wook;Yang Sang Sik
    • Journal of Mechanical Science and Technology
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    • v.19 no.2
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    • pp.649-654
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    • 2005
  • This paper presents fabrication and drive test of a peristaltic PDMS micropump actuated by the thermopneumatic force. The micropump consists of the three peristaltic-type actuator chambers with microheaters on the glass substrate and a microchannel connecting the chambers and the inlet/outlet port. The micropump is fabricated by the spin-coating process, the two-step curing process, the JSR (negative PR) molding process, and etc. The diameter and the thickness of the actuator diaphragm are 2.5 mm and $30{\mu}m$, respectively. The meniscus motion in the capillary tube is observed with a video camera and the flow rate of the micro pump is calculated through the frame analysis of the recorded video data. The maximum flow rate of the micropump is about $0.36\;{\mu}L/sec$ at 2 Hz for the zero hydraulic pressure difference when the 3-phase input voltage is 20 V.

디스크형 진동자를 이용하는 새로운 형태의 밸브리스 마이크로 압전 펌프

  • O, Jin-Heon;Im, Jong-Nam;Jeong, Ui-Hwan;Im, Gi-Jo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.11a
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    • pp.91-91
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    • 2009
  • Piezoelectric micro-pump should contain the physical running parts like check valves for acquiring the unilateral motion of fluid from the alternating motion of actuators. But the check valves raise many problems such as abrasion or exhaustive destruction by the recursive mechanical displacement To solve these problems, we propose a novle type piezoelectric valveless micro-pump using peristaltic motion due to the traveling wave excitation. Proposed pump model is consisted of two piezoelectric ceramic plates, elastic metal body, caps for covering flow path, rubber rings for sealing tightly and disk springs for the pressurization of pump body.

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A study on the peristaltic waveform of valveless PZT pump using disk type multi PZTs (다수 개 디스크 PZT 를 이용한 밸브리스 압전펌프의 연동구동 파형에 관한 연구)

  • Ham Y.B.;Park J.H.;Yun D.H.;Kim H.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.1824-1827
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    • 2005
  • For application to micro fluid control systems such as ${\mu}TAS$ (Micro Total Analysis Systems) and DDS (Drug Delivery Systems), it is very significant to handle precise and minute flow rates with low pressure pulsation. In this study, a novel valveless piezoelectric pump using peristaltic motion with three disk type PZT actuators is presented. The newly devised pump with an effective size of $70mm{\times}60mm{\times}55mm$ has three actuator layers connected in series from inlet to outlet. The PZT actuator has a maximum displacement of 240 ${\mu}m$ and a maximum force of 1.6 N. When the driving voltage for PZT actuators is sequentially applied with a certain phase shift, the pumping is performed by peristaltic motion of liquid volume. The working fluid is shut off without the driving voltage. Three methods for sequential driving are proposed and experimentally investigated. First and second methods utilize an intermittent sinusoidal waveform with phase shift of $90{\circ}\;and\;120^{\circ}$, respectively. Third method uses a rectangular waveform with phase shift of $90^{\circ}$. A controller with multi-phase shifter is designed and fabricated. Then, frequency and voltage-flow rate characteristics and load pressure-flow rate characteristics are experimentally investigated to verify the validity of the developed pump.

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Performance Improvement of Peristaltic Micropump Using Various Actuating Signal (다양한 동작신호의 사용에 따른 연동형 마이크로 펌프의 성능 향상)

  • Hong, Pyo-Hwan;Jung, Dong-Geon;Pyo, Dae-Seong;Lee, Jong-Hyun;Cho, Chan-Seob;Kim, Bonghwan
    • Journal of Sensor Science and Technology
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    • v.22 no.6
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    • pp.428-432
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    • 2013
  • This paper described the development of electrostatically driven peristaltic micropump. The proposed micropump consists of a flexible membrane and a single chamber which electrodes are inserted. The single chamber is divided into smaller cells by the electrodes. The fabricated micropump was operated with four electrodes in the membrane and a various phase sequencing actuation. We studied the changes in the flow rate corresponding to the actuating signal applied to the micropump under the zero hydraulic pressure difference between lnlet port and outlet port. The pump was operated from 60 to 130 V. Whereas the maximum flow rate in basic actuating signal is about 83 ${\mu}1/min$ at 15 Hz, the maximum flow rate in optimized actuating signal is about 114 ${\mu}l/min$ at 10 Hz.

Valveless piezoelectric micro-pump exploiting two sided disk type vibrator (디스크형 진동자의 연동 운동을 이용하는 밸브리스 마이크로 압전 펌프)

  • Oh, Jin-Heon;Lim, Jong-Nam;Jeong, Eui-Hwan;Lim, Kee-Joe
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.06a
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    • pp.159-159
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    • 2009
  • Existence of physical moving parts (ex. check valve) produces several problems (mechanical abrasion, deterioration of reliability, limited temperature performances etc.) in driving pumps. To overcome such problems, we proposed a valveless piezoelectric micro-pump which has new type volume transferring mechanism. The proposed micro-pump has a double faced disk type vibrator that can generate peristaltic motion formed by traveling wave in each surface of a disk. This type of micro-pump is able to apply to a fluid supply system that provides two different kinds of fluid simultaneously. In this paper, we propose a simple and novel design of piezoelectric micro-pump that is peristaltically by piezoelectric actuators and allows the removal of the need for valves of other physically moving parts. The finite elements analysis on the proposed pump model was carried out to verify its operation principle using the commercial analysis software.

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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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    • v.11 no.2
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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.

Electromagnetic Actuators for Drug Delivery Mini-Pump (약물 공급 미니펌프용 전자기 액츄에이터)

  • Cho, Doo-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.06a
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    • pp.533-534
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    • 2006
  • In this paper we propose a new model of a mini-pump with peristaltic motion and present the results of the finite element analysis of an electromagnetic micro actuator. The mini-pump consists of three diaphrams made of PDMS, three permanent magnets in cylinders, printed copper coils on glass substrates, and input and output port. The size of the mini-pump is $14\;{\times}\;40\;{\times}\;5.4$ mm3 and the permanent magnet diameter 6.2 mm $\times$ thickness 2 mm. The electromagnetic force applied on the magnet was about 0.84 N when the current of coils was 1 A, then the maximum displacement of the PDMS diaphram was about 2mm.

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