Evacuation of a liquid-vapor water mixture

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When a valve is opened in a vessel containing a liquid-vapor water mixture at 3000 kPa, the liquid water flows out while the vapor pressure remains constant due to the high temperature. As the liquid drains, the volume of vapor above increases, necessitating evaporation of water to maintain the partial pressure. This evaporation occurs at the same rate as the liquid flows out, keeping the total volume of water inside the control volume constant. The system relies on the balance between liquid removal and vapor generation to sustain equilibrium. Thus, the dynamics of liquid and vapor phases are crucial in understanding the behavior of the mixture during evacuation.
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evacuation of a liquid-vapor water mixture
suppose i have liquid and vapor water inside a vessel at say 3000kPa, then i suddenly open the valve, as the water (liquid) flows out the vessel (control volume) is water inside the cv evaporating at the same rate liquid flows out? so the volume of water inside the cv remains constant?
 
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3000 kPa is the vapour pressure of water at that temperature.
The valve at the bottom drains liquid water only.
As the liquid is removed, the gas volume above rises.
Water must evaporate to maintain the partial pressure.
 

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