Two-Phase Volumetric Expanders: A Review of the State-of-the-Art

Two-phase expansion is the process where a fluid undergoes pressure drop through or in liquid–vapor dome. This operation was historically avoided. However, currently it studied for multitude of processes. Due to volume increase volumetric expanders, occurs resulting flashing phenomena occurring. These have been before other processes such as two-phase flows static flash. this has not extensively expanders and mostly neglected. Even if data shown always neglectable depending on expander type. The thermal non-equilibrium occurring can be modeled different principles flows, mixture model, boiling delay homogeneous relaxation model. main application area current literature machines, low-temperature heat-to-power cycles. cycles benefit over classic options are available with efficiencies range at least 75%. Experimental investigation operation, though lacking quantity, that an achievable goal. know-how accomplish requires more studies, both experimentally modeling techniques within these expanders. present work provides brief but comprehensive overview experimental data, applicable techniques, models