This paper presents the three-dimensional numerical simulation of a micropump, including diffuser and analytical modelling of the micropump flow rate. The numerical simulation of the diffuser is performed in all possible flow regimes to optimize its geometry for maximum efficiency. The deflection of the piezoelectric polymer composite circular actuator is analytically solved by theory of bending plates to determine the volumetric change and flow rate. The result is then extended for actuator bonded to diaphragm of the micropump considering it as bilaminar plates. From the simulation results, it is found that and the diffuser angle >30° results in flow recirculation and reduction in the efficiency. The flow rate of the micropump obtained from analytical model and the numerical simulation are found to be similar. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.

Padmanabhan R

Mechanical

School of Mechanical Engineering

Chennai Campus

Revathi S

Electronics

School of Electronics Engineering

Padmapriya N

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

A design analysis of piezoelectric-polymer composite-based valveless micropump

International Journal of Modelling and Simulation

Valveless micropumps are extensively used in micro fluidic systems, including health care monitoring and diagnostic devices, computer devices, and so on, as it forms the critical component in the microsystem for precise and controlled fluid handling. This paper proposes the design and development of a novel, significantly low cost, planar micropump with piezoelectric polymer composite, consisting of lead zirconate titanate and polyvinylidene fluoride, for actuation. The novelty lies in the synthesis and use of the piezoelectric polymer composite as the actuating mechanism and the diffuser/nozzle design around the line of appreciable stall to achieve maximum flow rate for the given boundary conditions. The parametric study on the micropump geometry, including, chamber depth and diameter as well as diffuser/nozzle was carried out by using numerical simulations in COMSOL multiphysics, to analyze the fluid flow rate. The response of piezoelectric polymer to the applied sinusoidal voltage causes flow rectification in the micropump. An aspect ratio (diffuser length/diffuser width) of 15 produces maximum fluid flow rate. The designed micropump can achieve maximum fluid flow rate at low applied voltage and frequency of operation. [2018-0166] © 1992-2012 IEEE.

Journal of Microelectromechanical Systems

Design and Development of Piezoelectric Composite-Based Micropump

Micro-electromechanical systems are electrically sensed and actuated mechanical devices that are in micrometre-sized overall dimensions. The microsize of the system enables it to be used in several critical applications including healthcare where the system performance can be precisely controlled. One such application is micropump for drug delivery. Micropumps can be either valve based or valveless. Valve-based micropumps have mechanical check valves to control and deliver drugs through flaps or membranes. In valveless micropumps, the control is made through a diffuser/nozzle arrangement which regulates the liquid flow rate. In this paper, a valveless insulin pump based on piezoelectric actuation made of polymer-based material as diaphragm in planar type is constructed and the dependency of flow rate with material properties and size is studied. The modelling of the pump is carried out using COMSOL Multiphysics by coupling fluid structure interaction (fsi) and piezoelectric (pzd) physics module. The transient response of the flow rate and pressure distribution was studied. The dependency of flow rate with applied voltage, frequency and aspect ratio of the diffuser/nozzle was characterised by various size of the piezo layer and diaphragm layer. The effect on flow rate with polymethylmethacrylate and polydimethylsiloxane with single layer and stacked double layer was characterised. Sinusoidal actuating voltage is applied on piezoelectric material and varied up to a maximum of 180 V, 100 Hz. The simulation result proved that the flow rate can be effectively controlled with the application of appropriate combination of external sinusoid voltage, frequency and aspect ratio of the diffuser/nozzle. © 2016, © 2016 Informa UK Limited, trading as Taylor & Francis Group.

Advances in Materials and Processing Technologies

Study of the effect on flow rate for planar type polymer-based diaphragm piezoelectric actuated valveless micropump for insulin delivery

Diabetes Research and Clinical Practice

Evaluation of therapeutics management patterns and glycemic control of pediatric type 1 diabetes mellitus patients in Turkey: A nationwide cross-sectional study

This paper presents analytical modeling, 3-D electro-fluid-structural simulations, fabrication and test of a piezoelectrically actuated PDMS based planar valveless micropump. The analytical model considers force balance in the nozzle-diffuser elements and at the fluid-membrane interface to predict the natural frequency and flow rate performance of the proposed micropump. The numerical model employs two-way fluid-structure coupling to represent fluid-structure interaction (FSI) between the membrane and working fluid by mapping displacement data from the membrane to the fluid and force data from the fluid to the surface of the membrane. Also, electro-structure coupling between deformation of a piezoelectric disk due to an applied voltage and resulting displacement of the membrane is considered. Based on the simulations, the circular shape of the chamber used in conventional micropump designs is modified to include a taper at the outlet, which provides a significant improvement (∼28%) in the flow rate. Numerical simulations are performed to study the effects of the nozzle-diffuser angle and size, chamber diameter and height and membrane diameter and thickness on the flow rate. Using simulation results, a suitable design of the micropump is identified and the proposed micropump is fabricated. Experiments are performed to study the effect of frequency and voltage on the flow rate and pressure-flow characteristics. The predictions of the analytical model and numerical simulations in terms of flow rate versus frequency and voltage and pressure-flow characteristics compare well with the corresponding experimental data (within 20%). Using a peak-to-peak voltage of 30 V, the micropump delivers a maximum flow rate of 20 μL/min and back pressure of 220 Pa. The proposed micropump is polymer based and thus suitable for low-cost and disposable applications. © 2015 Elsevier B.V. All rights reserved.

Sensors and Actuators, A: Physical

Analytical modeling, simulations and experimental studies of a PZT actuated planar valveless PDMS micropump

Sensors and Actuators A: Physical

Study of an innovative one-sided actuating piezoelectric valveless micropump with a secondary chamber

Ceramics International

Experimental and theoretical dielectric studies of PVDF/PZT nanocomposite thin films

Journal	International Journal of Modelling and Simulation
Publisher	Informa UK Limited
ISSN	0228-6203
Open Access	0