Razumovskiy et al.
[19] demonstrated that at a relatively high value of q/G, pressure
drop caused by flow acceleration could not be neglected. For
frictional pressure drop, calculating the frictional resistance coefficient
is the main objective. Tarasova and Leontév [20] determined
that when lb/lw peaked within the vicinity of the pseudo-critical
region, the frictional resistance coefficient achieved its minimum
value. In general, pressure drop at supercritical pressures can be
estimated using correlations for pressure drop at subcritical pressures.
However, Ishigai et al. [21] reported that their experimental
pressure drop data were overvalued when calculated based on the
correlations fitted with subcritical pressure drop data. Pioro et al.
[22] conducted a literature survey to assess previous studies on
hydraulic resistance at supercritical pressures flowing in channels
with various geometries.