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FLUIDA library examples
Gas transfer system
This example represents a flow of hydrogen through a system with significant frictional pressure losses and vessel heat transfer.
The system to be simulated is a two reservoir/single receiver system shown in the figure below:
At time zero, reservoir 1 (100 cc) contains pure hydrogen at 100 bar and reservoir 2 (200 cc) contains pure hydrogen at 200 bar. The receiver (1000 cc) initially contains pure hydrogen at 1 bar. Each pipe is 0.1 metres long and has an ID of 0.002 metres. The orifice upstream of the receiver has an inside diameter of 0.0005 metres.
The model flow sheet is represented in the following figure. The model has been built by assembling volumes, valves, pipes, a tee component representing the branch, and a junction representing the orifice. Each pipe has been divided into 5 nodes.
The experiment imposes the following boundary conditions on the model:
- Gravity = 9.806 m/s2 (typical value at the Earth's surface).
- Wall temperature of the tanks = 293.15 K (it is assumed to be constant).
- Valve 1 opening law: Step opening after 1 millisecond.
- Valve 2 opening law: Step opening after 0.5 seconds.
The following figures illustrate the evolution over time of the pressure and temperature in the two reservoirs and the receiver.
