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# 3-17 - 3-17 The steady-state average residence time of a...

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3-17. The steady-state average residence time of a liquid inside a holding tank is computed by the ratio of the volume of the tank to the volume flow rate of liquid in and out of the tank, τ = V / Q . A cylindrical tank with volume V = 3 m 3 and the input mass flow rate of water is 250 kg/minute. At steady-state, the output flow rate is equal to the input flow rate. What is the average residence time of water in the tank? What would be the average residence time if the mass flow rate of water is increased to 300 kg/minute? What would be the average residence time if a load of 1.2 m 3 of stones is dropped into the holding tank? 3-17. The volume flow rate of liquid in and out the tank can be calculated as m Q ρ = (1) In the first case, applying equation 1 we have

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