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Updated: May 24, 2026
08:04
Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature
Published on: November 26, 2019
Indoor thermoregulatory homeostasis using hydrodynamic instability.
Raphael Kay1,2,3, Ross J Cocks1,4, Charles Katrycz1
1Department of Materials Science and Engineering, University of Toronto, Toronto, ON M5S 3E4, Canada.
Summary
Researchers engineered self-adjusting shading systems using Saffman-Taylor instability. These smart materials regulate indoor temperature by creating branching patterns that block or allow solar heat based on ambient conditions.
Area of Science:
- Fluid Dynamics
- Materials Science
- Thermoregulation
Background:
- Branching patterns form when fluids of different viscosities interact in confined spaces.
- Traditionally, engineering has focused on suppressing these flow instabilities.
- This study explores leveraging these patterns for novel applications.
Purpose of the Study:
- To exploit the thermal sensitivity of the Saffman-Taylor instability for thermoregulatory shading.
- To develop self-adjusting shading systems with negative feedback control.
- To enable on-demand switching of thermal sensitivity and indoor temperature setpoints.
Main Methods:
- Designing fluidic devices with specific geometries, liquid absorptivities, and rheology.
- Utilizing the Saffman-Taylor instability for pattern formation.
- Conducting experiments and developing models to analyze system performance.
Main Results:
- Demonstrated negative feedback branching patterns that reduce solar heating when warm and increase it when cool.
- Showcased the ability to switch thermal sensitivity and setpoints by adjusting pattern growth rates.
- Quantified energy savings and indoor climate control capabilities.
Conclusions:
- The developed thermoregulatory framework offers a novel approach to smart shading.
- This work provides a blueprint for designing self-regulatory materials based on flow instabilities.
- Highlights the potential for energy savings and enhanced indoor climate control.
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