The Power of Microbubbles

Why It Matters

Micro‑bubble air lubrication offers a retrofit‑friendly, energy‑efficient path to cut fuel use and emissions, directly supporting maritime decarbonisation targets.

Key Takeaways

• Microbubbles reduce hull friction by altering water density, not surface area.
• Bubble size must stay below 0.1 mm for optimal drag reduction.
• System consumes less energy than continuous air layer, no hull redesign needed.
• Maintaining bubble stream close to hull is critical due to buoyancy.
• Tests show up to 10% net energy savings combined with other technologies.

Summary

The video explains micro‑bubble air lubrication systems (ALS) that inject tiny bubbles along a vessel’s hull to cut frictional resistance.

Unlike a continuous air‑layer that reduces contact area, microbubbles change the water’s density around the hull. Optimal performance requires bubbles smaller than 0.1 mm; larger bubbles coalesce and lose contact due to buoyancy. The system needs less power than maintaining a full air sheet and avoids the stability challenges of the latter.

Real‑world trials, cited by Seatrade data (2002‑2015), indicate net energy reductions of up to 10 % when ALS is paired with other fuel‑saving measures. The International Maritime Organization mandates that the power used by blowers be deducted from the calculated savings for EEDI certification. Installation can be retrofitted without major hull modifications.

If widely adopted, micro‑bubble ALS could lower operational costs, reduce greenhouse‑gas emissions, and help shipowners meet tightening efficiency standards while complementing technologies such as rotor sails or solar panels.

Original Description

Instead of just a single flat layer of air, advanced systems shoot out tiny microbubbles (under 0.1 mm) all over the hull. These bubbles completely change the density of the water surrounding the ship. Real-world sea data proves that this simple yet crazy trick can save up to 10% in net energy and boost overall efficiency.