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Any ideas?

Cross-section (pipe is solid & hollow). [PLAIN]http://img138.imageshack.us/img138/5590/pipex.png Assuming suction on the left end, how can we expect the airflow to change as x varies?

Consider a pipe. One end of it (hole) is malleable, in that we can make it larger so that the cylinder adopts a conical shape (yet the other 'hole' does not change). If one were to apply suction at one end of the pipe, with respect to air flow, how does the pressure gradient vary within the...