How Long to Fill Tank B from Tank A Using a 100mm Pipe?

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To determine the time to fill Tank B from Tank A using a 100mm pipe, the flow rate must be calculated considering the decreasing pressure as Tank B fills. The total volume of Tank B is 50m^3, and the initial flow rate can be estimated using the pipe diameter and the Bernoulli equation. As Tank B fills, the flow rate will decrease due to the changing pressure head. The discussion emphasizes the need for a formula that can adapt to different pipe sizes and configurations. Understanding these principles is crucial for accurately calculating fill times in similar scenarios.
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Goodday . i wonder if anyone can help with this .
I looking for the formula to the below problem inorder to use same to transpose in case i shoild need the pipe size in another case


Two tanks , tank A and tank B.
How much time in hours to fill tank B. Where Tank A is a full water tank( always being filled up from the top)of 100m^3 with a pipe on the bottom filling into tank B , an empty water tank of 50m^3 . The pipe is 100mm in diametre.
Both tanks are 10 m high
And where 1m^3 of water = 1 ton

The problem I.m having is that the flow rate slows down as the tank fills'
 
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Have you tried the Bernoulli equation?
 
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