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Vol. 94, Issue 7, July 2008, pp.176-195

 

 

Bullet

Multifield Analysis of a Piezoelectrically Actuated Valveless Micropump

 

Asim Nisar1*, Nitin Afzulpurkar1, Banchong Mahaisavariya2, Adisorn Tuantranont3

1School of Engineering and Tech., Asian Institute of Technology (AIT), Thailand

2Siriraj Hospital, Faculty of Graduate Studies, Mahidol University, Thailand

3Nanoelectronics and MEMS Lab, National Electronics and Computer Technology Center, Thailand

E-mail: 1*Corresponding Author: Asim.Nisar@ait.ac.th

 

 

Received: 12 May 2008   /Accepted: 21 July 2008   /Published: 31 July 2008

 

Abstract: In this paper, a MEMS based piezoelectrically actuated valveless micropump with biocompatible polymer membrane materials for drug delivery applications is numerically studied by multifield code coupling method. In the multifield study, structural and fluid domains of a three dimensional model of the micropump are solved sequentially with piezoelectric-solid-fluid coupling. The effect of geometrical dimensions and different membrane materials such as polymethylmethacrylate (PMMA) and polydimethylsiloxane (PDMS) on micropump characteristics and efficiency of nozzle/diffuser elements of a valveless micropump is investigated in the multifield analysis. The deformation results of the membrane using multifield code coupling analysis are in good agreement with published results of single code coupling analysis of a piezoelectric micropump. The analysis predicts that there is a definite relationship between membrane and piezoelectric actuator thickness to obtain maximum pump flow. The analysis predicts that optimal piezoelectric actuator thickness is dependent on membrane material properties. The diffuser efficiency is a strong function of diffuser geometrical dimensions and pressure loss coefficients. To enhance the performance of the micropump, diffuser geometrical dimensions such as diffuser length, diffuser neck width and diffuser angle need to be optimized.

 

Keywords: Drug Delivery, MEMS, Multifield analysis, Multiple Code coupling, PDMS, Piezoelectric, PMMA, Valveless micropump

 

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