Abstract
Supercritical flow experiments were conducted with two vertical parallel heated channels made of INCONEL 825. Different system parameters such as pressure (7.4 MPa to 9.1 MPa), inlet temperatures (7°C to 30.1 °C) and variable singular pressure drop coefficients were used. The heating power was increased gradually, at constant pressure and inlet temperature, until self-sustained out-of-phase oscillations were observed. Fifteen parallel channel out-of-phase instability boundary points were obtained. Not only the outlet temperature oscillated out-of-phase but the wall temperature near the outlet also oscillated out-of-phase. These results are meant to be used for code validation and to enrich the limited database of supercritical parallel-channel instability