| dc.description.abstract |
In this work the condensation process of steam inside a
converging diverging nozzle is simulated, the experiments
on which were performed by Moses and Stein [1]. Three
different flow solvers are used for this purpose, namely,
Ansys Fluent, Ansys CFX and the open source flow solver
OpenFOAM. The aim of the current work is to narrow
down the choice of the flow solver which can finally
be used for simulating non-equilibrium condensation of
Carbon Dioxide inside ejectors. The pressure distribution
predicted inside the nozzle by the three solvers follow
closely the experimental one. However, the location and
amount of pressure rise due to the condensation onset are
differently predicted by the flow solvers. Only one plateau
is observed in the pressure curve experimentally while at
least two different plateaus are predicted numerically. For
the vapor temperature and supercooling, the three solvers
predict similar values before the condensation onset. After
start of condensation, Ansys Fluent and OpenFOAM give
similar results while Ansys CFX predicts at least 10 degree
higher values. Ansys CFX predicts a wider nucleation zone
compared to the two other solvers. The highest discrepancy
being displayed by the solvers appears in the distribution
of droplet diameter and droplet number density. However,
the three solvers predict similar trend for the liquid mass
fraction distribution inside the nozzle |
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