Study Of The Mechanism Of External Condensation Of Vapor In Pneumatic Systems

During the running of pneumatic system,we can find that the temperature of some components will go down . When the temperature get to the environment dew point,there will be dew on the surface,when the temperature is below zero,we even can find ice on the components.This is the external condensation problem.This problem is a great threat to the safety and service life of the pneumatic system.So this article is the research about it,we try to find out the principle of the external condensation and get a effective method to judge when it will happen,this will give great help to the designer.At the beginning of this article,we give the analysis about the principle of external condensation.we find out that the most important factor in the condensation is the temperature of the air in the system.And we point out the factors which can make influence in the external condensation,such as the temperature and the humidity of the environment,the temperature and the pressure of the supplying air,the load of the system,the area of passage of speed control valve,and so on.Next,we give the mathematics model of the pneumatic system using the knowledge of aerodynamics and heat transfer theory.And using the finite difference method and the numerical analysis we can get the solutions of the model.We use C program to simulate the model. In the next chapter,we introduce the experiments we have done about the external condensation,and the analysis of data,try to find out the association of the factors and the condensation phenomena.Finally,the article show the analysis of the simulation of the long time vertical loaded condition,introduce the judge program and how to avoid the external condensation. This article show the principle of the pneumatic system external condensation,set the mathematics model of the system,and find the solution for it,do a lot of experiments and accumulate many data about the external condensation,all this work give great help to finally find the simple and effective method to judge the external condensation of the pneumatic system.