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In pneumatic systems, the condensation of water resulting from variations in air temperature leads to a reduction in lubrication, erosion and freezing of the components, and which leads to trouble. With growing demand for improving the characteristics and reliability of a pneumatic system, more attention has been given to this problem. Therefore, in a previous study (1st report), we investigated the features of the condensation, the conditions of generation and the influencing factors by numerical simulation using a homogeneous condensation theory. In this paper, the condensation of water in a pneumatic system is investigated. First, the surface tension coefficient, which has a great influence on results of simulation regarding the generation of condensation is evaluated using the measurements of the degree of supersaturation when the condensation occurs. Next, the critical curves for the condensation which depends on the initial conditions (initial temperature, pressure and humidity of the air in the container) are found, and the validity of the homogeneous condensation theory is demonstrated by comparing the results with the simulated ones.

Study on Condensation of Water in Pneumatic Systems.