抄録
The aim of the present study is to investigate the nonequilibrium condensation of alternative Freon vapor on the cold wall behind the shock waves. To clarify the relation between the shock wave propagation and the phase change of vapor behind the shock wave on the shock tube side wall, the liquid film thickness and heat flux are measured. Experiments were carried out by using a diaphragmless and a low temperature shock tube that can be cooled down to 100K by using liquid nitrogen. The time dependent thickness of liquid film was measured by an optical interferometric method based on multiple reflections of a He-Ne laser beam at the interface of the thin liquid film and the transparent optical glass. The condensation heat flux was measured by a platinum thermo-sensor. It is found that the liquid film thickness and the condensation heat flux rapidly change behind the reflected shock waves. It is also found that for the same initial temperature, a higher p2 led to a faster growth of the liquid film, however it is not cleared the difference in the liquid film growth behind the reflected shock wave.
