A numerical study of the behaviour of carbon dioxide in valves
conference paper
In CO2 storage in depleted fields control valves are used to choke the flow at the wellhead. Often a phase transition occurs across the valve, with liquid or supercritical CO2 upstream and two-phase gas-liquid flow downstream of the valve. To better understand the behaviour of CO2 in chokes, in this work the flow of CO2 through a nozzle is simulated in 1-dimension using three different models: an isenthalpic mode, an Euler model and an enhanced mass transfer (EMT) model. The results are compared to experimental results from Nakagawa et al. [1] [2]. The isenthalpic model can reproduce the experimental results reasonably well in case no shockwaves occur. These shock waves can be obtained in the Euler model and EMT models. The EMT model is significantly more accurate than the other models, showing non-equilibrium mass transfer is important to predict the phase transition in a valve. However, it is also the most complex to implement and the most computationally expensive. Matching the experimental data to a very high accuracy requires tuning of the condensation and evaporation coefficients in the EMT model.
TNO Identifier
1000055
Source title
12th North American Conference on Multiphase Production Technology, MPNA 2024, Banff, AB, Canada, 22-24 May 2024
Collation
14 p.
Pages
371-384
Files
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