Can a Magnetohydrodynamic Drive Work Without a Tube?

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SUMMARY

The discussion centers on the feasibility of a Magnetohydrodynamic (MHD) drive operating without a tube, specifically exploring alternative designs that utilize a ship's hull. It concludes that while a tube is commonly used to channel water, a hull could theoretically pull the vessel through water if designed with ridges to accommodate magnets. However, this design poses challenges, such as the need for external electrodes and the risk of magnetic interference affecting navigation. The hull material also plays a critical role, as magnetic materials like iron would guide the magnetic field along the surface, while conductive materials like aluminum would lead to corrosion issues.

PREREQUISITES
  • Understanding of Magnetohydrodynamic (MHD) principles
  • Familiarity with magnetic field dynamics
  • Knowledge of material properties, specifically magnetic and conductive materials
  • Basic concepts of ship hull design and hydrodynamics
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  • Research the principles of Magnetohydrodynamic drives in detail
  • Explore the effects of magnetic fields on navigation systems
  • Investigate materials suitable for MHD hull designs, focusing on magnetic and conductive properties
  • Study advanced ship hull designs that incorporate magnet placement for MHD applications
USEFUL FOR

Marine engineers, physicists specializing in fluid dynamics, and researchers in alternative propulsion systems will benefit from this discussion.

Godspanther
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Now the designs I've seen involve water flowing through a tube but is a tube really necessary? Can the design simply be turned inside out so that rather than pushing water through a tube a regular ships hull could just pull the vessel through the water?
 
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The problem is making a strong magnetic field. The tube passes through the poles of a magnet with an enclosed short magnetic path.
An external magnetic field would upset the compass and radiate energy. It would also require electrodes on the outside of the vessel hull.
 
Mmm.. I see. What if the hull is ridged like a piece of corrugated metal? The magnets could be placed in the ridges. Then instead of passing thru one magnet between the poles it could pass between the opposing poles of two different magnets. Of course in total the hull would have many such opposing magnets.
 
Godspanther said:
What if the hull is ridged like a piece of corrugated metal? The magnets could be placed in the ridges.
Which would require an electrode outside the hull, making the corrugation a tube.

If the hull was magnetic material like iron, the magnetic field would follow the hull surface, not pass through the water. A conductive metal hull like aluminium would short circuit the electrodes and corrode.

See here for internal or external flow.
https://en.wikipedia.org/wiki/Magnetohydrodynamic_drive#Typology
 

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