换热器中气液相变过程的热力学耦合研究

Study on the Thermodynamic Coupling in the Gas-liquid Phase Transition Process in Heat Exchanger

制冷系统的换热器中存在气液相变过程,为了揭示气液相变过程中传热与传质过程之间的相互作用机制,介绍了孤立系统中热力学耦合的3种情况,运用孤立系统的热力学耦合对换热器中气液相变过程进行深入研究。研究结果发现,气液相变换热过程中的热量传递过程和相变传质过程之间的相互作用机制符合能量转换的热力学耦合机制,即熵产率大于零的自发过程可以驱动熵产率小于零的非自发过程。

There is a gas-liquid phase transition in the heat exchanger of refrigeration system.In order to detect the interaction mechanism between the heat transfer process and the mass transfer process in the process of gas-liquid phase transition,this paper introduced the three kinds of thermodynamic coupling in the isolated system,and further studied the gas-liquid transition process in heat exchanger by using the thermodynamic coupling in the isolation system.The results showed that the interaction mechanism between the heat transfer process and the mass transfer process in the process of gas-liquid phase transition conformed to the thermodynamics coupling mechanism of energy conversion,that is,the spontaneous process with entropy production rate greater than zero can drive the non-spontaneous process with entropy production rate less than zero.