Wirtz pumps are really clever

A video on YouTube. In Science & Engineering, a Krater category.

Summary by Krater

Steve Mould investigates why Wirtz pumps stop working when the pipes are too narrow, explaining how air locks accumulate across pipe segments.

From the video

Answers: Why does a Wirtz pump stop working when pipe diameters are too small?

Air locks in a Wirtz pump are cumulative, meaning each section must overcome the pressure of all preceding air locks.
The height of the water column in a Wirtz pump's intake must be greater than the sum of all intermediate air lock heights combined.
If the circumference of the inner segments of a spiral pump gets too short, water will bubble and spill over between segments instead of pumping upwards.

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