Harvard Researchers Study Pig Hearts to Uncover How Fluid Noise Triggers Soft Valve Closure

Phys.org Science•Published: Oct 8, 2026 04:30 PM IST

Researchers at Harvard University, led by Mengfei He, have investigated how biological heart valves operate efficiently without active motors by studying pig mitral valves and simplified synthetic models. Using high-speed cameras, pressure sensors, and turbine flow meters, the team analyzed how thin valve leaflets react to fluid pressure and backflow.

Pig Heart Analysis: Scientists examined extracted pig mitral valves alongside a physical model consisting of a thin elastic cone inside a rigid tube to track leaflet deformation.
Role of Fluid Noise: The study revealed that random fluctuations in fluid flow act as a switch, causing flexible walls to buckle inward and form a tight seal.
On-Demand Triggering: Researchers discovered they could deliberately force the synthetic valve to close by injecting targeted flow pulses into the water stream.

The Context & Background

This research addresses long-standing questions in fluid dynamics regarding how biological systems manage unidirectional fluid transport. Understanding these mechanisms paves the way for designing innovative, unpowered soft artificial valves for various engineering applications.

Why it matters:This discovery provides critical design principles for next-generation artificial soft valves used in medical devices and engineering systems. By harnessing fluid noise rather than fighting it, engineers can create more efficient, unpowered fluid control systems that mimic nature's elegance.

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