利用ΔS总判断自发变化过程的方向

The Spontaneous Change Judged by Total Entropy Criterion

ΔS总判据是对封闭系统内变化方向的基本判据.教材中认为,该判据只能判断变化过程的不可逆性,而不能判断变化过程的自发性或没有强调应用ΔS总判断变化过程的自发性.通过对不同条件下的ΔS总判据与相应热力学判据关系的研究指出,ΔS总判据等效于相应的热力学判据.ΔS总判据不仅能判断变化过程的不可逆性,还可以进一步判断变化过程的自发性.

The total entropy criterion is the basic criterion about the direction of change in a closed system.In the literature,the irreversible process can be judged,but the spontaneous process can not be judged.The relationship between the total entropy criterion and the corresponding thermodynamic criterions was analyzed in the present article under the different conditions.The total entropy criterion was equivalent to the corresponding thermodynamic criterions,the irreversible process can be not only judged,but also the spontaneous processes can be further determined in chemical engineering by using this criterion.