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LSM-SEMINAR
Direct Numerical Simulation of Evaporation and Condensation in the Presence of Non-Condensable Gases
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Europe/Zurich
OHSA/E13
OHSA/E13
Description
Presence of non-condensable gases in a gas mixture has considerable effects on interfacial heat and mass transfer. The industrial significance of this phenomenon underpins the need for computational tools capable of its simulation. Recent advances in computational power permit the implementation of species transport into direct numerical simulation codes. The aim of this project was to understand the phase change phenomena in the presence of non-condensable gas through numerical simulations. Rigorously derived governing equations, using both mass and volume average velocities, were introduced in order to simulate the mixture of condensable and non-condensable gases accurately. The governing equations were re-formulated and discretised, taking into account the jump conditions at the phasic interface. An algorithm for the coupling of mass and volume average velocities was newly developed and subsequently implemented in the Computational Fluid Dynamics code PSI-BOIL. The verification and validation procedure of the implemented method was performed, employing several analytic and experimental test cases: a one-dimensional problem for verification together with several three dimensional problems of droplet evaporation and bubble condensation were used. Very good agreement with benchmark data was achieved.
