Irreversible equations with more than one variable contain off-diagonal terms describing couplings between diagonal effects (cross effects). In this chapter we are going to consider a system with two variables: the particle number and energy of a subsystem of a larger system. The diagonal processes are the flow of particles driven by a pressure difference between the subsystem and the rest, and a flow of heat driven by a temperature difference. The cross processes are obtained when in the foregoing sentence the words pressure and temperature are exchanged.
KeywordsPressure Difference Particle Flow Cross Effect Superfluid Component Thermomechanical Effect
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