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# lec 7 - exit At inlet 1 water vapor enters at p 1 = 7 bar...

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Lec 7 Control Volumes and Mass Balances Control Volume – A prescribed, bounded region under study. The boundary may be fixed or may move and deform. Mass may cross the control volume boundary. Mass Rate Balance Conservation of mass requires e i cv m m dt dm & - = For several inlets and outlets Evaluating mass flow rate:

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One dimensional mass flow Steady state form of mass balance: Volumetric flow rate:
Example problems A water heater operating in steady state has two inlets and one

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Unformatted text preview: exit. At inlet 1 water vapor enters at p 1 = 7 bar and T 1 = 200 °C with mass flow rate of 40 kg/s. At inlet 2 liquid water at p 2 = 7 bar, T 2 = 40°C enters through an area A 2 = 25cm 2 . Saturated water exits at 3 with a volumetric flow rate of .06 m 3 /s. Determine: 1. Mass flow rate at inlet 2 2. Mass flow rate at the exit 3. Velocity at inlet 2. Transient example: Barrel filling with water...
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lec 7 - exit At inlet 1 water vapor enters at p 1 = 7 bar...

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