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Problem with sudden discharge in high-pressure differential pipelines?

2016-06-19View Original

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It is known that the working medium in the pipe is superheated gas, the inner diameter of the pipe is 81 mm, the pressure before the valve is 2.5 MPa, while the pressure after the valve is 1 MPa; thus the pressure ratio before and after the valve exceeds the critical value of 1.8 MPa. If the valve opens quickly, how will the flow rate and velocity in the pipe change at this time? How to calculate it? The pipe length is about 2 meters, and it is then connected to a container. Will the flow rate reach the critical value? Then how does it change?

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