Abstract
It has recently been shown that laminar, pressure-driven flow of a conducting fluid in a helical pipe can generate a dynamo. Geometrical constraints have hitherto required a relatively small Reynolds number, and a much larger magnetic Reynolds number, Rm. Here, a configuration with two interwoven helical pipes is considered which is shown to drive a dynamo at a Reynolds number of a few hundred and Rm > 30. Various computer animations of the dynamo are available with the online version of the paper. It is found that hydrodynamic instabilities may inhibit the dynamo, but may also be regularized by it. It is also shown that a dynamo pump is possible, with flow down one pipe generating a field which drives flow in the second. Movies are available with the online version of the paper.
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