Analysis of entropy production in some enclosed subsystems where spontaneous processes take place

2016 INCAS Bulletin  
It is well-known that every spontaneous process occurring in an isolated system is accompanied by increasing entropy. The goal of this paper is to show that if the system is made of several subsystems, the entropy production of some subsystems can be negative, without violating the 2 nd law. An analysis of the instantaneous entropy generation is presented, considering two simple cases of spontaneous processes, namely heat and mass transfer between two volumes of gases. The calculations show
more » ... lculations show that, in the case of mass transfer, it is possible one subsystem to exhibit a negative entropy production, although the total entropy production of the whole system is positive, according to 2 nd law.
doi:10.13111/2066-8201.2016.8.3.3 fatcat:gxvlxhsvjndqjgjcyx4gys4lxy