抄録
The purpose of this study is to clarify nonequilibrium condensation of the refrigerant HFC134a vapors on shock tube wall behind both incident and reflected shock waves. The diaphragmless shock tube with cooling by liquid nitrogen has been utilized for the experiment at low temperature. We set initial temperature of driven gas 190~220K and set incident shock wave Mach number 2.0~4.0.Thickness of condensing liquid film is measured by optical interferometric method based on multiple reflections of He-Ne laser beam. Heat flux of wall is also measured by Platinum thin film thermo-sensor. As the results, shock wave characteristics in test fluids nitrogen and HFC134a are clarified.. It is also found that growth of the liquid film thickness of HFC134a depends on the nonequilibrium degree of pressure. For the measurement by Platinum thin film thermo-sensor, the values of heat flux are bigger when liquid film grows faster. and heat flux values have rapid increase behind reflected shock wave.
