Lets say i want to cool a fluid(gas) in a condenser. The fluid(gas) to be cooled enters the condenser with a temperature of 200 K and changes its phase at 150 K(liquid now) and will leave the condenser with a temperature of 130 K.
1- Does the mass flow rate of the fluid change after it is at liquid phase or does the mass flow rate stay constant? When the temperature of the fluid changes, its density and thus viscosity and flow velocity will change, I'm struggling to understand what happens to the mass flow rate.
2- And do i need to place a condensate drum after the condenser before the liquid is transported to a container? At the beginning the fluid(gas) will flow due to the pressure difference, but when it is now liquid, do i have to store it in a condensate drum and pump it to a container or is it not necessary? Here i want to understand how the liquid motion will behave. Will it keep to flow or do i need to place a condensate drum and collect it, then pump it to a container or should i place a pump direct after the condenser or are these not necessary?
Hi,
The mass flow rate is constant, but the volumetric flow rate of the different. All the other properties indeed change. Changing the temperature in a small range will change the density and viscosity in a negligible value.
If the liquid couldn't flow due to gravity, you need a pump to move it.
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