Fluid to fluid scaling of heat transfer with supercriticalpressure fluids: Recent considerations and future perspectives

The contribution reports on the ongoing work at the University of Pisa about fluid to fluid scaling with supercritical pressure fluids. The first studies in this regard started in 2006 when relevant non dimensional quantities were introduced for analysing flow instabilities, supposing the existence of similarities between the exceeding of the pseudo-critical temperature in supercritical fluids and the boiling threshold in subcritical ones. Since the beginning interesting features where noticed, e.g. the fact that the non-dimensional density trend (𝜌∗) seems to be a function of the dimensionless enthalpy (ℎ∗) only, regardless of the supercritical pressure and, in general, of the fluid.