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A COMPARISON OF THE EQUILIBRIUM AND THE DROPLETS BASED NON-EQUILIBRIUM COMPRESSIBLE PHASE CHANGE SOLVERS FOR CONDENSATION OF CARBON DIOXIDE INSIDE NOZZLES

Kapil Dev Choudhary, Shyam Sunder Yadav, Mani Sankar Dasgupta
Frontiers in Heat and Mass Transfer (FHMT) 16 - 14 (2021)


Abstract


There is recent surge in the use of CO2 for various industrial applications which involve condensation of CO2 at high speeds during certain phases of the working cycle. There is also a need to quantify this condensation behaviour with respect to the distribution of vapor supercooling; droplet nucleation rate, droplet diameter and number density; the maximum liquid mass fraction obtained inside the equipment.  In the current work, we simulate the condensation of supercritical CO2 during its high speed flow inside two different converging-diverging nozzles.  We use the homogeneous equilibrium method and the classical nucleation theory based non-equilibrium phase change model for this purpose. The simulation results indicate significant influence of the nozzle inlet condition, nozzle shape and the fluid thermophysical behaviour on the non-equilibrium conditions prevailing inside the nozzles. We present various results on the distribution of vapor supercooling level, nucleation rate, droplet size and number density and liquid mass fraction inside the nozzles.  These results will be useful to the engineering community involved in the design and fabrication of CO2 based systems.

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DOI: http://dx.doi.org/10.5098/hmt.16.14

ISSN: 2151-8629