Mechanism and experiment of the internal condensation of water vapor in pneumatic system

The internal condensation is investigated by taking single driving system as an example, and the mechanism of internal condensation is unveiled as follows: When the ability of moving condensed vapor toward the blind end is greater than the ability of moving it out of the system, internal condensation occurs; Otherwise, it does not occur. By using mass density to represent the formmer ability and volume ratio to represent the latter one, a dividing curve is obtained on the plot of mass density versus volume ratio. The experiment of the internal condensation in a pneuamtic system is carried out, the results are verified by the experiment.