Can water be repeled with the force from superconductivity gathering current on the surface cuased by Faraday law of induction? I'm trying to make a ROV that can run underwater that uses superconducters close to the surface of the outer skin of the ROV to negate a tad of the friction caused by water. Since I'm getting differnet answers can any of you support your position with a article?
The way to minimize drag in any fluid is to minimize disturbing it.
Fluids don't have friction the same way solid objects have friction, by a sliding interface.
When fluid flows next to a surface, it sticks to the surface. The "sliding" is actually in the form of viscous deformation of the fluid itself in a layer next to the surface (the boundary layer).
What causes the most drag is turbulence. That's when the boundary layer breaks away from the surface and you get eddies, which suck up energy, i.e. drag.
The best way to minimize drag (in a vehicle not moving too fast) is to keep the boundary layer stuck to the surface (laminar flow).
In aircraft, a technique used to keep the boundary layer attached to the surface is to install vortex generators.
You won't negate any of the friction with the water by preventing it touching the skin, you'll just make the friction worse, because the boat will be slightly bigger. The amount of friction force is entirely determined by the momentum transferred from the boat to the water, and this quantity doesnt really care if the water is touching the boat or not. It is entirely determined by the flow required to make the water go around the boat, and the wakes that develop drag the boat the same amount whether it is directly touching, or levitating.
Yes, if you make insanely powerful magnet based on this superconductor. In any way, this won't be enough to go without friction underwater.
And the sad part is that high-temperature superconductors can't withstand strong magnetic field, and loose their superconductivity. Super-strong magnets are helium cooled.