Quantitative visualization of injection jet flow behaviors of transcritical and supercritical processes by pixelated phase-shifting interferometer

•Quantitative measurement of transient transcritical/supercritical jet under high pressure cell.•Improved phase-shifting interferometer system realized by pixelated-array masked method.•Subcritical jet flow fragmentation and atomization found under interfacial tension with density pulsations.•Jet flow goes cross pseudo-critical line with large gradient under pseudo-boiling expansion.