• Title, Summary, Keyword: Peristaltic flow

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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.

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.

Numerical Study of the Magnetohydrodynamic Heat Transfer Peristaltic Flow in Tube Against High Reynolds Number

  • Hamid, A.H.;Javed, Tariq;Ali, N.
    • Journal of the Korean Physical Society
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    • v.73 no.9
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    • pp.1295-1302
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    • 2018
  • In the present investigation, we have studied the magnetohydrodynamic (MHD) heat transfer of peristaltic flow in a tube. The analysis is made without imposing any assumption to obtain the streamline and isothermal line directly. Galerkin's finite element method has been used on the governing Navier-Stoke's equation in the form of ${\psi}-{\omega}$. The graphs of the computed longitudinal velocity, temperature and pressure are plotted against different value of the emerging parameter by using the stream function and vorticity. The results are valid beyond the long wavelength and the low Reynolds number limits. We conclude that higher values of the parameters are not independent of the time mean flow rate.

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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    • 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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Development of a Peristaltic Micropump with Lightweight Piezo-Composite Actuator Membrane Valves

  • Pham, My;Goo, Nam-Seo
    • International Journal of Aeronautical and Space Sciences
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    • v.12 no.1
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    • pp.69-77
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    • 2011
  • A peristaltic micropump with lightweight piezo-composite actuator (LIPCA) membrane valves is presented. The micropump contained three cylinder chambers that were connected by microchannels and two active membrane valves. A circular miniature LIPCA was developed and manufactured to be used as actuating diaphragms. The LIPCA diaphragm acted as an active membrane valve that alternate between open and closed positions at the inlet and outlet in order to produce high pumping pressure. In this LIPCA, a lead zirconium titanate ceramic with a thickness of 0.1 mm was used as an active layer. The results confirmed that the actuator produced a large out-of-plane deflection. During the design process, a coupled field analysis was conducted in order to predict the actuating behavior of the LIPCA diaphragm; the behavior of the actuator was investigated from both a theoretical and experimental perspective. The active membrane valve concept was introduced as a means for increasing pumping pressure, and microelectromechanical system techniques were used to fabricate the peristaltic micropump. The pumping performance was analyzed experimentally in terms of the flow rate, pumping pressure and power consumption.

Improvement of Measurement Precisions for Uranium Isotopes at Ultra Trace Levels by Modification of the Sample Introduction System in MC-ICP-MS

  • Park, Ranhee;Lim, Sang Ho;Han, Sun-Ho;Lee, Min Young;Park, Jinkyu;Lee, Chi-Gyu;Song, Kyuseok
    • Mass Spectrometry Letters
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    • v.7 no.2
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    • pp.50-54
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    • 2016
  • Multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) is currently used in our laboratory for isotopic and quantitative analyses of nuclear materials at ultra-trace levels in environmental swipe samples, which is a very useful for monitoring undeclared nuclear activities. In this study, to improve measurement precisions of uranium isotopes at ultratrace levels, we adopted a desolvating nebulizer system (Aridus-II, CETAC., USA), which can improve signal sensitivity and reduce formation of uranium hydride. A peristaltic pump was combined with Aridus-II in the sample introduction system of MC-ICP-MS to reduce long-term signal fluctuations by maintaining a constant flow rate of the sample solution. The signal sensitivity in the presence of Aridus-II was improved more than 10-fold and the formation ratio of UH/U decreased by 16- to 17- fold compared to a normal spray chamber. Long-term signal fluctuations were significantly reduced by using the peristaltic pump. Detailed optimizations and evaluations with uranium standards are also discussed in this paper.

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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    • 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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Studies on Solvent Sublation of Trace Heavy Metals by Continuous Flow System as Ternary Complexes of 1,10-Phenanthroline and Thiocyanate Ion

  • Kim, Young-Sang;Choi, Yoon-Seok;Lee, Won
    • Bulletin of the Korean Chemical Society
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    • v.24 no.12
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    • pp.1775-1780
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    • 2003
  • A continuous flow system has been developed to determine trace Cu(II), Mn(II), Ni(II) and Zn(II) in a large volume of water samples by a solvent sublation technique. The mixed solution of 1,10-phenanthroline(phen) and thiocyanate ion was used as ligands for the formation of their ternary complexes. The continuous system was constructed in this laboratory with a peristaltic pump, a mini shaker, three mixing bottles and a flotation cell by connecting each part with a polyethylene tube. The flotation conditions such as the flow rate of sample solution and the injection rates of ligand, buffer and surfactant solutions have been investigated to obtain the best sublation efficiencies. Each solution flowed into the flotation cell through each polyethylene tube by the peristaltic pumps. The ternary complexes were floated and extracted into MIBK in a flotation cell of 2 L by bubbling a nitrogen gas. The absorbances of extracted analytes in MIBK were directly measured by graphite furnace-AAS. The concentrations of 1,10-phenanthroline and thiocyanate ion were $2.6\;{\times}\;10^{-3}$ M and $2.3\;{\times}\;10^{-2}$ M in the mixed solution, respectively. The pH of sample solution was adjusted to 5.0 with a buffer solution and 1%(m/v) sodium lauryl sulphate solution was added as a surfactant to support the effective flotation of the complexes. The $N_2$ gas was bubbled at 30 mL/min for 90 minutes for 20 L of sample. Reproducible results of less than 10% RSD and recoveries of 80-120% could be obtained in real samples.

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.

Design and Prototyping of a Novel Type Piezoelectric Micro-pump

  • Oh, Jin-Heon;Lim, Jong-Nam;Lee, Seung-Su;Heo, Jun;Lim, Kee-Joe
    • Transactions on Electrical and Electronic Materials
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    • v.9 no.5
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    • pp.181-185
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    • 2008
  • Using the extensional vibration mode of PZT ring, a piezopump is successfully made. The PZT ring is polarized with thickness direction. The traveling extensional wave along the circumference of the ring is obtained by dividing two standing waves which are temporally and spatially phase shifted by 90 degrees from each other. The proposed piezopump is consisted of coaxial cylindrical shells that are bonded piezoelectric ceramic ring. The pump takes an unobtrusive operation into the simple displacing mechanism using peristaltic traveling waves without the physical moving parts. 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 is about 580 ${\mu}l/min$ in flow rate with the highest pressure level of 0.85 kPa, when the driving voltage is 150 $V_p$, 57 kHz.