2 edition of Time-dependent electro-structural-hydrodynamic model of a single chamber peristaltic micropump. found in the catalog.
Time-dependent electro-structural-hydrodynamic model of a single chamber peristaltic micropump.
Aye Nyein San
Written in English
An innovative micropump capable of delivering small flow rates for applications in drug delivery and DNA transport is presented. The device consists of one pump chamber with multiple electrodes for peristaltic motion, and two passive valves to further direct the flow. A two-dimensional fluid-structural analytical model is developed. A fully coupled Finite Element Model is also presented. A passive valve geometry is optimized for low Reynolds number flow with periodic driving pressure. Various micropump configurations are analyzed. The results show a reduction of resonance frequency due to fluid damping. For a 300 mum long micropump with 12 mum microchannel depth and 4 mum thick silicon membrane, the structural resonance is ∼340 kHz and the reduced fluid-structural resonance is ∼24 kHz. With an improved Heaviside square wave excitation signal at 300 V, a maximum average flow rate of 3.98 muL/min and a pressure of 120 kPa is seen for the two-electrode model.
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The medium was delivered to the cylindrical microbioreactor chamber (D: mm, H: 1 mm) by a pneumatically driven membrane-based micropump at a uniform flow rate between and μl/h. The chamber had a shallow cylindrical cavity (D: 1 mm, H: μ m) to accommodate the cells/scaffold for 3D cell by: (). For related discussion see also R. P. Feynman, Phys. Rev. functions of a single parameter, a, which increases monotonica (). along the world line of the first particle; likewise for b, c, etc. 2 Now at Cornell University, Ithaca, N. Y. An arbitrary assumed motion of File Size: 1MB.
Start studying Module 3 Quiz 2 Electrodynamics. Learn vocabulary, terms, and more with flashcards, games, and other study tools. the book and (equally) to propose problems (and solutions) they believe should appear in a future edition. At a fairly advanced stage in the writing of this book, I decided that a source should be cited for every end-of-chapter problem in the book. Unfortunately, I had by that time spentFile Size: KB.
Electro-hydrodynamic (EHD) flows are investigated theoretically and numerically in this paper and results are presented for the flow field in model electrostatic precipitators (EPs). The resulting flow fields are shown in various representations and explained qualitatively. Numerical calculations with different flow models (non-turbulent and RANS) were conducted to investigate the influence of Cited by: Kong et al. directly incorporated CTCs into the flow streams in a four-chamber BOC system driven by a syringe pump to model organ-specific metastasis (Figure 5A). 42 The introduction of CTCs into the perfusion allows the study of the interactions between CTCs and endothelial monolayers of specific organ models under flow, which are a first step Cited by:
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The book is intended primarily as a guide and reference for researchers, although selected chapters can well be used as a textbook for graduate studies. Enter your mobile number or email address below and we'll send you a link to download the free Kindle App. Then you can start reading Kindle books on your smartphone, tablet, or computer - no Cited by: Dynamic simulation of a peristaltic micropump over the planar domain corresponding to the ﬂuid chamber, which approximately has the same area, A, as the diaphragm.
A single level micropump chamber and a fluidic microchannel are molded on the upper side of the elastomer. Additionally, two through-holes are punched into an elastomer, one into the center of the micropump chamber and the other one at the end of the channel.
The micropump chamber and the microchannel are sealed with a thin glass by: A theoretical model of the fluid behavior of the micropump was also developed with the assumption that the peristaltic micropump is working in a steady state flow. Peristaltic micropump based on piezoelectric diaphragm was reported by Ling-Sheng Jang et al .
Theoretically they require 3 or more reciprocating diaphragm membranes as shown in figure A single-valve model, based on nonlinear equivalent electrical circuits, is numerically and analytically solved in relevant cases, leading to qualitative and quantitative agreements with experiments.
where Coulomb's constant is and is the permeability of free space. The first two equations have charge and current present and are referred to as the inhomogeneous equations, while the second two do not and are referred to as the homogeneous identity can be combined with the divergence of Ampere's law to time derivative of Gauss's law gives, so that adding the two.
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.
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Introduction. Pumping is one of the most common and elementary function in microfluidics. Although external (syringe or peristaltic) pumps are mostly used in laboratory experiments for the precise dispensing of fluids, the realization of miniaturized pumps has attracted attention in the development of integrated lab-on-a-chip (LOC) the first silicon micropump by van Lintel et Cited by: Novel concept for flow-rate and flow-direction determination by means of pH-sensitive ISFETs Author(s): Arshak Poghossian; Lars Berndsen; Hans Lueth; Michael J.
Schoening. In this section, we visualize numerical results, evaluated via Mathematica symbolic software, to explore the influence of the key electro-magnetic and hydrodynamic parameters on the flow variables in Fig. 2, Fig. 3, Fig. 4, Fig. consider the dual amplitude peristaltic wave scenario i.e.
with two different wave amplitudes (ϕ 1, ϕ 2) at the upper and lower walls of the by: This paper presents a novel dosing concept for drug delivery based on a peristaltic piezo-electrically actuated micro membrane pump. The design of the silicon micropump itself is straight-forward, using two piezoelectrically actuated membrane valves as inlet and outlet, and a pump chamber with a piezoelectrically actuated pump membrane by: 5.
So the time-dependent liquid pressure is calculated as (13) P l = 1 c 2 Q 0 + Q A sin 2 π t T 0 2 + P 0. Results Stabilizing effects of the pulsation dampener system in experiments. Before we started the investigation of the stabilizing effects, the flow rate from the peristaltic pump used in our experiments was by: 1.
which encloses it. The simplest possible set of images would be a single charge q0; if there is such a solution, symmetry considerations tell us that the image must be located on the line passing through the origin and going in the direction of n0.
Let us therefore put an image charge q0at point x0 0 = r0 0n0. a x0 x0’ q q’ V conductorFile Size: KB. Simulation of interfacial dynamics of time-dependent converging flows in microchannels R.
Prabhu, Darren L. Hitt Proc. SPIEMicrofluidics and BioMEMS, pg (28 September ); doi: / Hydrodynamic Electrochemistry Using Rotating Electrodes Short Course at ECS meetings This course is intended for scientists and engineers who are interested in using rotating electrodes in their projects.
The combined PK-PD model could be considered a dynamic model because it includes a time-dependent variable. The chamber simulating the two organs was integrated into a microchip and a chamber for culture, and an on-chip peristaltic micropump.
The PDMS-membrane-based peristaltic pump was operated by pressure and its operation enabled the Cited by: 7. Micropump performance simulation, presented in Fig. 5, exhibits an optimum of micropump backpressure and average flow rate performance characteristics at chamber radius of 4 mm.
Simulation results indicates that maximal flow rate and backpressure performance is achieved when pumping chamber is slightly smaller than PZT by: 3.
- 2 - the force acting on a positive test charge. The electric field E, generated by a collection of source charges, is defined as E = F Q where F is the total electric force exerted by the source charges on the test charge is assumed that the test charge Q is small and therefore does not change the distribution of the source Size: KB.
Introduction. The major functions of the small intestine are digestion and absorption. The small intestinal wall is composed of four layers—the mucosa, submucosa, muscularis externa, and serosa—and is connected by the vascular and nervous systems to perform gastrointestinal functions with mechanical movement, including peristalsis and mixing processes (Lee and Sung, ).Author: Seung Hwan Lee, Jong Hwan Sung.Hydrodynamic construction of the electromagnetic field Peter Holland Green College University of Oxford Oxford OX2 6HG England [email protected] 11th June Abstract We present an alternative Eulerian hydrodynamic model for the electromagnetic field inFile Size: 1MB.Chapter 16 – Hydrodynamic Separators Vortechs Stormwater Treatment System The Vortechs Stormwater Treatment System is a precast rectangular unit composed of three chambers.
The first chamber serves as a grit chamber, and creates a swirling motion that directs settleable solids toward the center where they become trapped.
TheFile Size: 1MB.