 1
 0
1. Homework Statement
The level of benzene in a storage tank may fluctuate between 10 cm and 300 cm from the top of the tank. Since it is impossible to see inside the tank, an openend manometer fluid is to be used to determine the benzene level.
One leg of manometer is attached to the tank at the position of 400 cm from the top. A nitrogen blanket at atmospheric pressure is maintained over the tank contents. (as in image)
What manometer readings R(cm) would be observed at the extremes of the benzene level with water/ mercury as the manometer fluid?
which manometer fluid would you use and why?
2. Homework Equations
P=ro*g*h + P(atm)
3. The Attempt at a Solution
the P at both legs of the manometer where the fluid is same level is same so
P(on open end of manometer) = P(atm) + ro (density of water as manometer fluid)*g*R
same for Pressure in the tank (at other end of manometer whith P of benzene in tank) =
P(atm) + ro(Benzene) *g* H (which is height of column of Benzene in tank )
and these two pressures are the same ,
by having H then we can find R . The problem is that I cant figure out how to find H, because we have the manometer 400 cm from top , but it doesnt say about the height of column of benzene on the manometer leg.
Thanks
1. Homework Statement
2. Homework Equations
3. The Attempt at a Solution
The level of benzene in a storage tank may fluctuate between 10 cm and 300 cm from the top of the tank. Since it is impossible to see inside the tank, an openend manometer fluid is to be used to determine the benzene level.
One leg of manometer is attached to the tank at the position of 400 cm from the top. A nitrogen blanket at atmospheric pressure is maintained over the tank contents. (as in image)
What manometer readings R(cm) would be observed at the extremes of the benzene level with water/ mercury as the manometer fluid?
which manometer fluid would you use and why?
2. Homework Equations
P=ro*g*h + P(atm)
3. The Attempt at a Solution
the P at both legs of the manometer where the fluid is same level is same so
P(on open end of manometer) = P(atm) + ro (density of water as manometer fluid)*g*R
same for Pressure in the tank (at other end of manometer whith P of benzene in tank) =
P(atm) + ro(Benzene) *g* H (which is height of column of Benzene in tank )
and these two pressures are the same ,
by having H then we can find R . The problem is that I cant figure out how to find H, because we have the manometer 400 cm from top , but it doesnt say about the height of column of benzene on the manometer leg.
Thanks
1. Homework Statement
2. Homework Equations
3. The Attempt at a Solution
Attachments

7.4 KB Views: 778