Numerical assessment of a two-phase Tesla turbine: Parametric analysis

The scenarios on the future energy systems invariably point to heat pumps as an emerging technology reach efficiency goals alongside and CO2 reduction targets. Moreover, they may progressively foster use of chillers refrigeration units. In this study, a that could enhance based inverse cycles is analysed. Particularly, two-phase flow behaviour Tesla turbine numerically investigated. main objectives are clarify role second phase, actual operating range, examine mixing. Two computational approaches developed, relying customised home-built mathematical model CFD analyses carried out with commercial software. calculations performed for R404a fluid over significant ranges rotational speed, plate gap size, roughness. All critical liquid–vapour interactions determined discussed utilising solution Eulerian-Eulerian approach frame motion technique. other homogeneous finite-difference solution, mass transfer directly phase diagram neglecting phase-interaction parameters. two compared some available experimental results from literature, revealing excellent agreement. show average power output 0.8 W delivered torque 3.6 mN-m at speed about 2000 RPM. numerical analysis explains different effects conditions efficiency, paving way accurate design boundary layer turboexpanders under these conditions.