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Condensation Microchannel VOF

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Old   December 6, 2019, 06:27
Post Condensation Microchannel VOF
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Nicola Benvenuti
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currently i'm working on a multiphase cfd simulation on Ansys Fluent.
I'm trying to simulate the condensation process of r134a (refrigerant) in a veretical microchannel 3.4mm wide and 300mm. The vapour enters at saturation conditions and volume fraction 1. The free stream velocity is 1.99 m/s (G=100 kg/s; density=50.085 kg/m^3).
I'm working in a 2D axysimmetric geometry. The grid is a structured mesh with 510000 and y+ =1.
I chose the k-w SST model with low reynolds correction and implicit formulation for VOF, as i'm trying to obtain a stationary result.
Moreover i wrote a UDF to implement the Lee Model for condensation, defining the Mass Transfer properties.

Right now I'm really struggling to obtain a good convergence of the continuity equation. Indeed the mass flow rate difference between inlet and outlet increases at first and the start to fluctuate.
Any Suggestion?

Thanks for your attention!
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Old   April 5, 2022, 05:05
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What coefficients are you using for Lee's Model? This coefficients have strong impact on mass balance.
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condensation, continuity equation, microchannel, vof multiphase

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