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# Pipes and Fluids Watch

1. Hey people, i have another question to ask on pipes and fluid system. So this is the question (i have attached a picture of the question as well):

'A pipe contains a gradually tampering section in which its diameter decreases from 400 mm - 250 mm. The pipe contains an in-compressible fluid of density 1000kgm^-3 and runs full. If the flow velocity is 2.5ms^-1 in the smaller diameter, determine the velocity in the larger diameter.

Could someone explain and show me in detail how to get the velocity in the larger diamter please, much appriciated
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2. The mass flow rate through the top is equal to the mass flow rate through the bottom since it is incompressible, therefore equate the top and bottom.

The mass flow rate can be expressed in terms of the density, velocity and cross sectional area (hint: it has units of kgs^-1).
3. (Original post by StudyNinja1)
Hey people, i have another question to ask on pipes and fluid system. So this is the question (i have attached a picture of the question as well):

'A pipe contains a gradually tampering section in which its diameter decreases from 400 mm - 250 mm. The pipe contains an in-compressible fluid of density 1000kgm^-3 and runs full. If the flow velocity is 2.5ms^-1 in the smaller diameter, determine the velocity in the larger diameter.

Could someone explain and show me in detail how to get the velocity in the larger diamter please, much appriciated
hey i dont know da exact way but i figured out dis way....a simple ratio method.
250mm/1000=0.25m
400mm/1000=0.4m

0.4:0.25
x:2.5
X=(2.5*0.4)/0.25
so x=4ms^-1
hope its correct and do tell me da correct answer and any better way!!!
.
4. (Original post by Mort89)
The mass flow rate through the top is equal to the mass flow rate through the bottom since it is incompressible, therefore equate the top and bottom.

The mass flow rate can be expressed in terms of the density, velocity and cross sectional area (hint: it has units of kgs^-1).
can u explain me ur idea...i guess u r very rite!!

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