6 ms·

> have occasionally wondered why it hasn't been implemented. Because underwater hull part may be caused via cavitation erosion.[0,1,2] [0] https://www.iboats.

> have occasionally wondered why it hasn't been implemented. Because underwater hull part may be caused via cavitation erosion.[0,1,2] [0] https://www.iboats.com/propellers/what-prop-cavitation https://www.iboats.com/propellers/what-prop-cavitation [1] https://www.thoughtco.com/cavitation-causes-and-remedies-2293276 https://www.thoughtco.com/cavitation-causes-and-remedies-229... [2] https://www.southampton.ac.uk/engineering/research/projects/cavitation_erosion_corrosion_of_ship_propeller_materials.page https://www.southampton.ac.uk/engineering/research/projects/...

bernulli 6y ago
Those are two very different things. The OP article talks about introducing air bubbles into the stream along the hull, the articles you linked talk about cavitation bubbles, i.e. water that vaporizes when the pressure locally drops. The latter collapse spectacularly and do indeed damage to surfaces. The former don't. [edit: clarified which articles I mean]
- app4soft 6y ago
  > introducing air bubbles into the stream along the hull Placing air bubbles into the stream along the iron/steel hull in seawater... This is the worst idea as it would drastically increase oxidation.[0] [0] https://pubs.acs.org/doi/10.1021/es0109242 https://pubs.acs.org/doi/10.1021/es0109242
  - loriverkutya 6y ago
    Let’s forget about the thick layer of paint between the steel and the water...
    - app4soft 6y ago
      > Let’s forget about the thick layer of paint between the steel and the water... If seawater oxidation around the boat would be increased then thick layer of paint should be thinned to prevent steel corrosion, which also means increasing cost of the boat.
  - bernulli 6y ago
    Most boats/ships already get wet with (sea)water, alternating with air at the water level. Hardly a new problem.
PicassoCTs 6y ago
There is research into solving this with sacrificial material? Last i remember, there was the idea to have a coat of carbon fibre enhanced ice to ablate and soak up the damage, while regenerating from below?
- app4soft 6y ago
  > Last i remember, there was the idea to have a coat of carbon fibre enhanced ice It may be used (probably with low profit) for small vehicles/boats, but not for big ships.

bernulli 6y ago

Those are two very different things. The OP article talks about introducing air bubbles into the stream along the hull, the articles you linked talk about cavitation bubbles, i.e. water that vaporizes when the pressure locally drops. The latter collapse spectacularly and do indeed damage to surfaces. The former don't. [edit: clarified which articles I mean]

app4soft 6y ago
> introducing air bubbles into the stream along the hull Placing air bubbles into the stream along the iron/steel hull in seawater... This is the worst idea as it would drastically increase oxidation.[0] [0] https://pubs.acs.org/doi/10.1021/es0109242 https://pubs.acs.org/doi/10.1021/es0109242
- loriverkutya 6y ago
  Let’s forget about the thick layer of paint between the steel and the water...
  - app4soft 6y ago
    > Let’s forget about the thick layer of paint between the steel and the water... If seawater oxidation around the boat would be increased then thick layer of paint should be thinned to prevent steel corrosion, which also means increasing cost of the boat.
- bernulli 6y ago
  Most boats/ships already get wet with (sea)water, alternating with air at the water level. Hardly a new problem.

PicassoCTs 6y ago

There is research into solving this with sacrificial material? Last i remember, there was the idea to have a coat of carbon fibre enhanced ice to ablate and soak up the damage, while regenerating from below?

app4soft 6y ago
> Last i remember, there was the idea to have a coat of carbon fibre enhanced ice It may be used (probably with low profit) for small vehicles/boats, but not for big ships.