Problems in vacuum systems
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As shown in the figure, there are two pipes. If the valve is opened, will the liquid flow out?
No, unless Unit 1 is more than ten meters away and the liquid level in Unit 2 is more than ten meters away from the discharge outlet.
I’m wondering whether, at the moment the valve is opened and a vacuum is created in the pipeline, some liquid might spill out. If the bottom of a vacuum tank ruptures, won’t it be possible to see the liquid leaking out unless the vacuum pump is turned off?
If the vacuum is sufficient, it won’t be noticeable either
In the second case, when the valve is opened, the negative pressure tank first draws the liquid at the bottom of the tank up to a level of 9.8 m (water). At this point, the force of gravity equals the degree of vacuum, and the liquid flows downward. In the first case, when the pipe is not below the liquid level, opening the valve will cause gas to be drawn from the pipe into the vacuum tank. If it is necessary to maintain a constant vacuum level (with the vacuum level being maintained by a vacuum pump on the other end), then the liquid will not flow downward. But if considered on a local scale, the area around the bubbles formed by gas inhalation should be at near-normal pressure (I’m not entirely sure about this). In that case, does having a sufficiently large pipe diameter ensure that liquid will flow out as well, once the diameter is large enough? . . . . Suppose a vacuum tank has two layers, with the upper layer being kept under vacuum; if the partition in the middle is then opened, won’t the liquid flow downward as well? . .
The first scenario may result in flooding, with water being carried to the vacuum pump or condenser. In the second case, you indicated 5 meters; the water is sent to the gas-liquid separator. If it’s 9.8 meters, then that’s also the liquid level height. We have examples of vacuum system liquid seals in use, and it’s not the case that the water seal tank is lower or located at the inlet pipe.
The liquid level in the equipment is unknown, making it impossible to calculate accurately
No, but it might deflate the atmospheric pressure tank below you:lol:lol:lol
……It is related to the specific gravity of the liquid; the given conditions are not clear :)
If the liquid level height in the upper tank and the liquid level height in the lower tank are less than 10 m. Opening valve 1 will cause suction upward, while opening valve 2 will cause suction of liquid upward