How Seawater Sabotages Ships: Crash Course Engineering #43
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Date: 2022-04-04
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Comments and reviews: 10
Nelson
The steam bubble formed form the low pressure areas of the spinning propeller and the subsequent collapse of those bubbles near the surface of the propeller is what causes damaging cavitation. A similar thing can happen in a centrifugal pump. When large pumps start to cavitate they sound like they are trying to pump rocks. Cavitation is a phenomenon in which rapid changes of pressure in a liquid lead to the formation of small vapor-filled cavities, in places where the pressure is relatively low. When subjected to higher pressure, these cavities, called -bubbles- or -voids-, collapse and can generate an intense shock wave. Wikipedia
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The steam bubble formed form the low pressure areas of the spinning propeller and the subsequent collapse of those bubbles near the surface of the propeller is what causes damaging cavitation. A similar thing can happen in a centrifugal pump. When large pumps start to cavitate they sound like they are trying to pump rocks. Cavitation is a phenomenon in which rapid changes of pressure in a liquid lead to the formation of small vapor-filled cavities, in places where the pressure is relatively low. When subjected to higher pressure, these cavities, called -bubbles- or -voids-, collapse and can generate an intense shock wave. Wikipedia
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Michael
We need to use materials other than metal. How about learning from the car industry? Carbon fiber on plastic, along with coatings? What about having cheap/inexpensive drones that literally crawl along the hull of a ship like fish hanging onto a shark? On another note- What if you could break some of the waves before it actually hits the hull of the ship? At least as far as platforms go.
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We need to use materials other than metal. How about learning from the car industry? Carbon fiber on plastic, along with coatings? What about having cheap/inexpensive drones that literally crawl along the hull of a ship like fish hanging onto a shark? On another note- What if you could break some of the waves before it actually hits the hull of the ship? At least as far as platforms go.
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Bird_Dog
In the age of sail, sacrificial sheathing of cheap, low quality wood was added to the hull to protect the actual planks underneath from fouling - especialy the shipworm, a crustacean that burrows into the wooden hull, slowly destroying it.
Later copper sheathing was used instead, as the toxic effects of the copper effectively prevented foulign to occur in the first place.
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In the age of sail, sacrificial sheathing of cheap, low quality wood was added to the hull to protect the actual planks underneath from fouling - especialy the shipworm, a crustacean that burrows into the wooden hull, slowly destroying it.
Later copper sheathing was used instead, as the toxic effects of the copper effectively prevented foulign to occur in the first place.
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Meganopteryx
I think it's worth mentioning that when the Navy designed the new submarine propeller, it wasn't to prevent damage to the propeller, it was to make the submarines harder to detect underwater by preventing the noise of cavitation. Passive sonar is very important for submarines, and staying as quiet as possible to avoid detection is a great strategy.
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I think it's worth mentioning that when the Navy designed the new submarine propeller, it wasn't to prevent damage to the propeller, it was to make the submarines harder to detect underwater by preventing the noise of cavitation. Passive sonar is very important for submarines, and staying as quiet as possible to avoid detection is a great strategy.
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Simon
I am planning on joing the Canadian Coast gaurd college as a Marine Engineering, I like talking apart things and have been told I am a very inquisitive person. I also have learnt to sail at 9yrs of ags and live right by the Atlantic ocean. I love a adventure as well. Is this job suited for me?
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I am planning on joing the Canadian Coast gaurd college as a Marine Engineering, I like talking apart things and have been told I am a very inquisitive person. I also have learnt to sail at 9yrs of ags and live right by the Atlantic ocean. I love a adventure as well. Is this job suited for me?
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Basem
Technically, A ship designer is called a Naval Architect, who is the person dealing with all the aspects you've covered in the video. The engineer who works onboard is called a Marine Engineer. Thanks for the well-made video.
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Technically, A ship designer is called a Naval Architect, who is the person dealing with all the aspects you've covered in the video. The engineer who works onboard is called a Marine Engineer. Thanks for the well-made video.
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Basem
The most common way of building a large ship is to build it in units. Then assemble these units on a slipway. Building consumes a considerable amount of time; therefore, it's better not to occupy a dry dock for such time.
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The most common way of building a large ship is to build it in units. Then assemble these units on a slipway. Building consumes a considerable amount of time; therefore, it's better not to occupy a dry dock for such time.
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Ash
Why oh why have a British English speaker saying -aluminum-? It's so clunky and weird. Why not have her put on a phony American accent, or hire a US citizen if you want them to speak in US English?
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Why oh why have a British English speaker saying -aluminum-? It's so clunky and weird. Why not have her put on a phony American accent, or hire a US citizen if you want them to speak in US English?
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Stephen
-A cubic meter of water weighs a metric tonne- - Doing the conversions to American, it's a significant body of water - 264 gallons, weighs just over 1 non-metric ton as well. (2112 lbs)
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-A cubic meter of water weighs a metric tonne- - Doing the conversions to American, it's a significant body of water - 264 gallons, weighs just over 1 non-metric ton as well. (2112 lbs)
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Anno
Speak slower and don't just read the script blindly. English is not my native language so speaking like this will make it hard for me to understand. And thank you for this video: )
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Speak slower and don't just read the script blindly. English is not my native language so speaking like this will make it hard for me to understand. And thank you for this video: )
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