Variations of fluidic capacitance in the course of transient state changes

The paper examines the characterization quantity called capacitance, which is the accumulation of fluid inside a fluidic element occurring during nonstationary, time-dependent changes. Attention is given to the effect of nonlinearity and heat transfer, responsible for the variations of capacitance during a one-time, transient change. The conclusion from the performed analysis and measurements is that there is no justification for the introduction of a more involved characterization than the one provided by the differential capacitance of the increment of mass of fluid contained in the element, divided by the change of its specific energy.