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Published February 2007 | Published
Journal Article Open

Dynamic simulation of a peristaltic micropump considering coupled fluid flow and structural motion


This paper presents lumped-parameter simulation of dynamic characteristics of peristaltic micropumps. The pump consists of three pumping cells connected in series, each of which is equipped with a compliant diaphragm that is electrostatically actuated in a peristaltic sequence to mobilize the fluid. Diaphragm motion in each pumping cell is first represented by an effective spring subjected to hydrodynamic and electrostatic forces. These cell representations are then used to construct a system-level model for the entire pump, which accounts for both cell- and pump-level interactions of fluid flow and diaphragm vibration. As the model is based on first principles, it can be evaluated directly from the device's geometry, material properties and operating parameters without using any experimentally identified parameters. Applied to an existing pump, the model correctly predicts trends observed in experiments. The model is then used to perform a systematic analysis of the impact of geometry, materials and pump loading on device performance, demonstrating its utility as an efficient tool for peristaltic micropump design.

Additional Information

© Institute of Physics and IOP Publishing Limited 2007. Received 9 June 2006, in final form 24 November 2006. Published 22 December 2006. Print publication: Issue 2 (February 2007) This work was supported in part by the National Science Foundation (grants CTS-0304568 and CCR-0325344). The authors also wish to thank Dr Y Wang for his assistance in numerical computations.

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