Abstract: According to the relationship between generalized force and generalized flow, established all phase entropy generation rate equation, and analysed the relationship between entropy flow and total entropy generation of system. The results show that when the steady state, the decreasing of total entropy generation of system, the increasing of entropy flow and heat transfer, specifically, in the case that heat and mass transfer processes are both spontaneous process. When mass flow and heat flow are in the same phase, the decreasing of phase difference between mass flow and heat flow, the increasing of heat transfer, which reflects field synergy mechanism of energy transfer between two spontaneous process， with positive entropy generation rate,while in the case that heat transfer is nonspontaneous process， and mass transfer is spontaneous process. When mass flow and heat flow are in the opposite phase, the increasing of phase difference between mass flow and heat flow, the increasing of heat transfer, which reflects the thermodynamic coupling mechanism of energy conversion between spontaneous process,with positive entropy generation rate，and nonspontaneous process, with negative entropy generation rate. Between mass flow and heat flow from the same phase to the opposite phase, corresponding to the energy transfer mechanism of field synergy,and the energy conversion mechanism of thermodynamic coupling, all reflecting the minimum entropy generation principle for convective heat transfer.

Key words: all phase entropy generation rate equation, field synergy, thermodynamic coupling, convective heat transfer, minimum entropy generation principle

摘要： 在线性非平衡区域，对熵产率方程进行了相位拓展，建立了流动换热熵流变化与体系总熵产之间的关系。结果表明，熵产越小时熵流越大，则换热强度越大。当传热与传质均为自发过程，质量流与热流之间同相位时，两者的相位差越小，流动换热的强度越大，它反映了两个正熵产率过程间能量传递的场协同机制；当传热与传质分别为非自发及自发过程，质量流与热流之间反相位时，两者的相位差越大，流动换热的强度越大，它反映了正熵产率过程与负熵产率过程间能量转换的热力学耦合机制。质量流与热流之间由同相位到反相位，分别对应着场协同时的能量传递机制及热力学耦合时的能量转换机制，共同反映了体系流动换热时能量传递转换的最小熵产原理。

关键词: 全相位熵产率方程, 场协同, 热力学耦合, 对流换热, 最小熵产原理