Exam (84).pdf - Question A cylindrical holding water tank has a 3 m ID and a height of 3 m There is one inlet of diameter 10 cm an exit of diameter 8 cm

# Exam (84).pdf - Question A cylindrical holding water tank...

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Question: A cylindrical holding water tank has a 3 m ID and a height of 3 m. There is one inlet of diameter 10 cm, an exit of diameter 8 cm, and a drain. The tank is initially empty when the inlet pump is turned on, producing an average inlet velocity of 5 m/s. When the level in the tank reaches 0.7 m, the exit pump turns on, causing flow out of the exit; the exit average velocity is 3 m/s. When the water level reaches 2 m the drain is opened such that the level remains at 2 m. Find (a) the time at which the exit pump is switched on, (b) the time at which the drain is opened, and (c) the flow rate into the drain (m 3 /min). Answer : The basic continuity equation for a control volume, â€¦â€¦ (1) The first term represents the rate of change of mass within the control volume and the second term represents the net rate of mass flux out through the outlet surface. The equation (1) can also written as, Here the density of the fluid at inlet is , inlet velocity of the fluid is and the area of the inlet is and the volume of control

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• Summer '16
• boer
• Fluid Dynamics, cylindrical holding water tank

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