Cilia-driven transport in confined ducts: an active porous media model

TL;DR

This study models cilia-driven fluid transport in confined ducts using an active porous media approach, revealing how morphology influences flow and pressure limits, with implications for bio-inspired microfluidic design.

Contribution

The paper introduces a novel active porous medium model for cilia-driven flow, combining numerical and analytical methods to explore morphological effects on transport.

Findings

Transport decreases linearly with increasing pressure, indicating a trade-off between flow rate and pressure sustainability.

The model explains the diversity of ciliated duct structures, from high-throughput to pressure-generating configurations.

Provides principles for designing bio-inspired microfluidic pumps.

Abstract

Ciliated organs transport viscous fluids through confined ducts, yet how duct morphology and ciliary activity jointly set the limits of flow rate and sustainable pressure remains unclear. Here, we model dense arrays of beating cilia lining duct walls as an active porous medium driven by prescribed metachronal waves, and identify two key morphological parameters that govern transport: the ciliary confinement ratio and the mean ciliary fraction. The resulting flows are described by the incompressible Navier-Stokes-Brinkman equations, which we solve numerically using a spectral method in the low-Reynolds-number regime. We also develop a complementary mean-field analytical model. The active porous medium framework provides an intermediate description between classical envelope theories and filament-resolved simulations and enables a systematic investigation of how fluid transport is shaped by confinement and packing of ciliary material. We find that transport is characterized by a decreasing linear relationship between flow rate and pressure generation, marking a fundamental trade-off between throughput and sustainable adverse pressure. These results provide a unified physical interpretation of the morphological diversity of ciliated ducts, from high-throughput ciliary carpets to pressure-generating ciliary flames, and offer guiding principles for the design of bio-inspired microfluidic pumps.