Article Image

IPFS News Link • Science, Medicine and Technology

New Sub Sea Design Concepts

• arclein
Superhydrophobic surfaces are commonly constructed either by creating micro/nanostructures on hydrophobic substrates or by chemically modifying micro/nanostructured surfaces with materials of low surface free energy.

1 Comments in Response to

Comment by PureTrust
Entered on:

Reduced friction in water is absolutely great. But what about inertia with regard to the separation of the waters?

Water is a somewhat massive substance, especially in amounts that are displaced by submarines. In order for a submarine to move through water, it must first move the amounts of water ahead of itself, out of the way. The inertia of the water tends to keep the water from being moved.

The same holds true with the replacement of water into an area vacated by a moving submarine. Once a sub has departed a certain "spot" in the water, water must fill that spot. The inertia of the water tends to keep the water from filling that spot.

The faster the submarine moves through the water, the faster the water must be separated by the nose of the sub and reformed at the tail of the sub. Speed causes turbulence. Reduction in friction on the surface of the sub is terrific. But does it help with regard to the displacing of the waters fore and aft of the sub?

Inertia of the waters is the big problem regarding speed of both ships and submarines. This is the reason hydrofoils are so much faster than ships and boats... very little displacement of water. Therefore, very little inertia to overcome.