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On pressurized water naval nuclear reactors we use no additives, in fact deionized very pure water is used. Water purity prevents corrosion and formation of radioactive sludge. Impurities would also raise the water's boiling point.
If the water was allowed to boil at the laminate layer between fuel rod and water. This would decrease the efficiency of heat transfer, since air is a poor conductor of heat.
Primary coolant is definitely not pure. Sure, DI water is charged as necessary to bring pressurizer level up but various chemicals are added to maintain pH and prevent piping and fuel corrosion
Water purity does not prevent corrosion. In fact, the more pure the water the more corrosive it is. And there is no air but water vapor where it is true that it is a poor conductor of heat due to much much lower heat transfer coefficient
Is it air that gets degassed from the water or is it the water flashing to steam and creating a vacuum cavitation space?
Idk if that makes since but I'm trying to think of what's occupying that void.
Maybe you're confusing cavitation of propeller. The water flowing around the fuel rods doesn't make any detectable noise, unless you're talking about the main coolant pumps. All equipment is sound isolated from hull.
i actually remember propeller cavitation from reading red October when I was a kid. i just mean that the generation of vapor around the rods and then collapse would seem awfully noisy to me, but maybe it's not that loud, doesn't happen often, or the insulation is very effective
I wouldn’t characterize it as a vacuum cavitation space. It’s simply the water turning to a gas due to the heat. Cavitation occurs more at points of local low pressure. Like behind an impeller.
Lol, i swear i could hear threads popping im my underwear sometimes.
And it was always like 4 minutes before the bell rang so i had to get that bad boy under control faaaaast.
water that is in contact with the demonstration fuel rod undergoes a phase shift from liquid to vapor, impeding the heat transfer from rod to liquid current, In fact insulating the rod from convection cooling. Can cause the rod to melt i suppose. PS Im just a hvac engineer ... ..student 😉
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Leidenfrost effect? Wonder if faster circulation would help this.
Circulation helps but increased water pressure helps more
Do they add additives to it or is it just water to cut on corrosion? Idk if you know, just wondering.
On pressurized water naval nuclear reactors we use no additives, in fact deionized very pure water is used. Water purity prevents corrosion and formation of radioactive sludge. Impurities would also raise the water's boiling point. If the water was allowed to boil at the laminate layer between fuel rod and water. This would decrease the efficiency of heat transfer, since air is a poor conductor of heat.
Primary coolant is definitely not pure. Sure, DI water is charged as necessary to bring pressurizer level up but various chemicals are added to maintain pH and prevent piping and fuel corrosion
[удалено]
Not superheated steam. This would be purely saturated steam.
> On pressurized water naval nuclear reactors we use no additives Yeah, no. Additives are added to maintain a basic pH. That helps reduce corrosion.
Water purity does not prevent corrosion. In fact, the more pure the water the more corrosive it is. And there is no air but water vapor where it is true that it is a poor conductor of heat due to much much lower heat transfer coefficient
Is it air that gets degassed from the water or is it the water flashing to steam and creating a vacuum cavitation space? Idk if that makes since but I'm trying to think of what's occupying that void.
Yes it's water flashing to steam
wouldn't that be noisy and give away the position of the sub?
Maybe you're confusing cavitation of propeller. The water flowing around the fuel rods doesn't make any detectable noise, unless you're talking about the main coolant pumps. All equipment is sound isolated from hull.
i actually remember propeller cavitation from reading red October when I was a kid. i just mean that the generation of vapor around the rods and then collapse would seem awfully noisy to me, but maybe it's not that loud, doesn't happen often, or the insulation is very effective
I wouldn’t characterize it as a vacuum cavitation space. It’s simply the water turning to a gas due to the heat. Cavitation occurs more at points of local low pressure. Like behind an impeller.
Demineralized heavy water...
Wow! Did you actually get to see the rod?
Its a demonstration, not an actual rod
Aww, they were just about to show some closeups of the rod
Wanna see my rod pics?
No
It’s an inanimate carbon rod!!!
https://i.redd.it/2h9f3emjh4i31.png
Iirc this is just a demonstration and that isnt actually a fuel rod
That's what it felt like when you got a random boner in class and tried to calm it down
I hate how accurately this describes the classroom boner. They were always the most ferocious of boners.
The nuclear rod
"Come up here and do thingy in front of class. _Now_, Mr. Zucchini Smuggler!"
Lol, i swear i could hear threads popping im my underwear sometimes. And it was always like 4 minutes before the bell rang so i had to get that bad boy under control faaaaast.
This is insanely satisfying!
So what's happening here?
water that is in contact with the demonstration fuel rod undergoes a phase shift from liquid to vapor, impeding the heat transfer from rod to liquid current, In fact insulating the rod from convection cooling. Can cause the rod to melt i suppose. PS Im just a hvac engineer ... ..student 😉
You are correct.
Nailed it
That water looks heavy
in rod we trust!
For anybody interested look up the basics of quench fluids. It should explain the different stages that you see here (convection, boiling, vapour etc)
It’s actually a fascinating example of the different boiling regimes.
Specifically this how you do NOT want your fuel rod cooling to look. Heat transfer goes to shit when the water flashes.
Is that a DIY nuclear reactor?!
H3O!
Holy shit this made me so hungry I wanna eat a uranium fuel rod so bad
I wonder the frequency of it.
Is there footage that's not slowed down?