Peruvian Whistling Vessels are weird

Summary by Krater

Steve Mould investigates how Peruvian whistling vessels work by using X-rays, 3D printing, and cutaways to reveal their internal chamber and pipe geometry.

From the video

Answers: How do Peruvian whistling vessels work?

• Peruvian whistling vessels
• fluid dynamics in whistles
• X-ray imaging of ceramics
• surface tension in fluid flow
• chamber and pipe geometry

What it concludes

• Whobbling sounds in whistling vessels occur when air flow is restricted by a narrow escape path and a wide connecting pipe.
• A narrow connecting pipe creates higher surface tension that impedes smooth fluid exchange and causes wobbling sounds.
• Cutaway versions without narrow escape channels or with wider connecting pipes do not produce wobbling sounds.
• Some vessels feature a second whistle activated only on the return tilt when water forces air through it.