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On the Longitudinal Wave Pumping in Fluid-filled Compliant Tubes
Arian Aghilinejad1, Bryson Rogers1, Haojie Geng1
1Department of Aerospace and Mechanical Engineering, University of Southern California, 1002 Childs Way, Los Angeles, CA 90089, USA.
Physics of Fluids (Woodbury, N.Y. : 1994)
|December 6, 2024
Summary
This study explores a novel longitudinal impedance pump that uses wall stretching to generate flow. Pumping efficiency depends on stretching frequency and tube properties, offering insights for future pump designs.
Area of Science:
- Fluid dynamics
- Biomedical engineering
- Computational modeling
Background:
- Traditional impedance pumps utilize wave propagation in compliant tubes.
- The human aorta exhibits dynamic stretching and recoil during the cardiac cycle.
- This study is inspired by the aorta's mechanics to develop a new pump.
Purpose of the Study:
- To investigate the physics of a longitudinal stretching-based wave pumping mechanism.
- To analyze the fluid-structure interaction in a novel impedance pump design.
- To understand the relationship between pump parameters and flow generation.
Main Methods:
- Developed a fully coupled fluid-structure interaction computational model.
- Simulated a fluid-filled elastic tube with longitudinal stretch and a fixed reflection site.
- Quantified pump behavior based on stretching frequency and tube wall characteristics.
Main Results:
- Stretch-related wave propagation and reflection induce frequency-dependent pumping.
- A non-linear relationship exists between mean flow and stretching frequency.
- Net flow direction and magnitude are strongly dependent on wave characteristics.
Conclusions:
- The longitudinal impedance pump's performance is governed by wave dynamics.
- Findings provide fundamental understanding for stretch-related wave pumping.
- Results can inform the design of novel valveless pumps.
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