Discussion Overview
The discussion explores the concept of whether an underwater barrier, analogous to the sound barrier in air, can be broken by an object moving faster than sound in water. Participants examine the implications of such a phenomenon, including the formation of shock waves and cavitation effects.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant questions if an object can move faster than the speed of water molecules and what the consequences would be.
- Another participant suggests that a water shock wave would form at the bow of the object and notes that sonar would be ineffective due to the speed of the object exceeding that of sound in water.
- A different viewpoint clarifies that moving "faster than sound" refers to surpassing the speed of sound waves, not the movement of water molecules.
- It is mentioned that while the speed of sound is greater in water than in air, no conventional boat or torpedo reaches this speed, though supercavitating torpedoes can achieve significant speeds through cavitation.
- One participant asserts that supercavitating torpedoes do indeed move faster than sound in water by creating a bubble of air around them, effectively allowing them to travel through a medium that is not water.
- A later reply acknowledges the previous correction about the torpedoes, noting that they do not actually exceed the speed of sound in water but rather travel within a bubble of air.
Areas of Agreement / Disagreement
Participants express differing views on the nature of the underwater barrier and the mechanics of supercavitating torpedoes. There is no consensus on whether an underwater barrier analogous to the sound barrier exists or the specifics of how supercavitating torpedoes operate.
Contextual Notes
Participants discuss various definitions of speed and the implications of moving through different mediums, but there are unresolved assumptions regarding the mechanics of sound and cavitation in water.