Good morning, I am facing the same problem. I have a thermosyphon which evaporator and condenser section are 0.05 m and 0.007 m of diameter copper pipe. The inner fluid is water and the filling ratio of the evaporator section is 40%. The operating pressure is 4000Pa and the saturation temperature is pressure dependent. The initial temperature has been set to 293 K. The water starts boiling but there seems to be no proper condensation. Can you help me with this?
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