
Hey all, I need some help on this question.
The correct answer is C. I understand why there will be lowre fluid velocity at point B. But I don't understand why fluid height in column 1 will remain unchanged. Thanks!
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Hey all, I need some help on this question.
The correct answer is C. I understand why there will be lowre fluid velocity at point B. But I don't understand why fluid height in column 1 will remain unchanged. Thanks!
Probably because of high viscosity? High viscosity is a deviation from being ideal and Bernoulli applies to ideal fluid.It is saying that after you swap one fluid for another, the pressure at point A will not change, because that pressure depends on the density of the fluid and the densities are the same.
It is saying that the pressure at B remains the same, because it is exposed to the atmosphere.
So it concludes that the pressure difference between A and B will be the same along the whole pipe, so the height will be the same.
I am just not sure why Bernoulli doesn't apply here.
Well viscosity is resistance to flow, so if viscosity increases then the fluid velocity will decrease at point B. As for why fluid height doesn't change, let's first look at the factors that impact height of a fluid in a column.
Pressure = density,fluid * gravity * height + P,atmosphere
Does P,atmosphere change? No.
Does pressure change at any place, in fact? No.
Does density change? The problem actually says it doesn't.
So when you solve for height, you'll see that all the variables are the same here -- and therefore the answer is C! Hope that helps.
It is saying that after you swap one fluid for another, the pressure at point A will not change, because that pressure depends on the density of the fluid and the densities are the same.
It is saying that the pressure at B remains the same, because it is exposed to the atmosphere.
So it concludes that the pressure difference between A and B will be the same along the whole pipe, so the height will be the same.
I am just not sure why Bernoulli doesn't apply here.
Probably because of high viscosity? High viscosity is a deviation from being ideal and Bernoulli applies to ideal fluid.
Thanks a lot. So let's say I want to find the height of column. So I solve for h.
h= (Pressure-P,atmosphere)/(density,fluid*gravity) What would be "Pressure" referring to? Is it just Pressure at point A? which will be density,fluid*gravity*(height of A)?