Microflow in a rhythmically expanding alveolar chip with dynamic similarity

Area of Science:

• Pulmonary fluid dynamics
• Biomedical engineering
• Particle transport

Background:

• Understanding fluid flow in lung alveoli is crucial for studying particle deposition.
• Previous models lacked detailed experimental validation of complex alveolar flow patterns.

Purpose of the Study:

• To experimentally investigate and numerically model fluid flow within a microfluidic alveolar chip.
• To characterize complex flow patterns and identify key phenomena like stagnation points in acinar flow.

Main Methods:

• Development of a microfluidic alveolar chip with rhythmic wall expansion.
• Precise control of flow parameters and detailed measurement of alveolar flow patterns.
• Comparison of experimental data with numerical simulation results.

Main Results:

• Detailed alveolar flow patterns were measured across different generations.
• Experimental observation of stagnation saddle points in alveolar flows for the first time.
• Complex chaotic flow patterns were confirmed through experimental and numerical data.

Conclusions:

• The study provides valuable experimental data for understanding complex alveolar fluid dynamics.
• Observed phenomena offer insights into the transport and deposition of micro- and nanoparticles in the deep lung.
• The developed platform serves as a valuable tool for future research in pulmonary mechanics.