Symmetric states conservation equations

The liquid phase model proposed below considers the mass transfer inside the droplet and the changes in liquid phase properties due to the temperature and composition changes. In derivation of the following equations, it has been assumed that liquid circulation is absent, the droplet surface is at local thermodynamic equilibrium state, momentum, energy and mass transfer are spherically symmetric within the droplet, and the two liquids (fuel and water) are immiscible. With these assumptions, the conservation equations for the total mass, mass of water, and the energy equation are written as follows [14] ... 

Equilibrium or conservation The notion of the mechanical equilibrium law is a particularity that is hardly transposable to other energy varieties because, in most of these, the notion of conservation is utilized instead of the notion of symmetry between state variables. In addition, the symmetric Equation C8.9 is perfectly valid during a movement of translation, as shown by a Formal Graph, which includes the relationships between displacement and velocity (the dipole flow). This is not compatible with the notion of static equilibrium that implies an absence of movement and therefore of time. 

---