The effect of a heat source on the adiabatic heating of a fluid in the vicinity of a critical point

For a fluid with near-critical parameters, the adiabatic heating referred to as the "piston" effect arising as a result of compression is investigated. The heating from a source of constant power is treated. One-dimensional analysis and numerical simulation of the effect are performed, and a comparison is made with a similar process developing from a source of constant temperature. It is found that, as the critical point is approached, the piston effect of the type under consideration ceases to depend on the parameters of the fluid, this qualitatively differing from the effect triggered by an isothermal source.