TY - GEN
T1 - Numerical simulation of atomization and mixing at a gas-liquid interface
AU - Adam, Carlton
AU - Hadim, Hamid
N1 - Publisher Copyright:
© 2018 Begell House Inc.. All rights reserved.
PY - 2018
Y1 - 2018
N2 - The propulsion of a discrete liquid slug from a launch tube by the high-pressure, high-temperature gas from a combustion reaction is simulated using a transient CFD model. The simulation was performed to study the effects of interfacial heat and mass transfer on the overall behavior of the launch system. The pressure of the combustion gas peaks at about 10 MPa, its temperature peaks at 2500K, and exit velocities of the multi-phase mixture exceed 100 m/s. The Volume-of-Fluid (VOF) method was used to compute volume fractions of the four individual species considered; namely atmospheric air, combustion gas, and water in both liquid and vapor phases. The evolution of the gas-liquid interface is presented at several time steps, as are several properties near the interface such as the temperature gradients and water volume fraction. Evaporation of water into the driving gas is shown to have a relatively small effect on the combustion reaction. Turbulent mixing at the gas-liquid interface, however, is shown to have significant effects on the structure of the liquid slug, especially upon its exit to the atmosphere. The behavior of the gas-liquid interface shows distinct similarities to the Rayleigh-Taylor instability observed in the experimental study of Nevmerzhitsky, et al [1].
AB - The propulsion of a discrete liquid slug from a launch tube by the high-pressure, high-temperature gas from a combustion reaction is simulated using a transient CFD model. The simulation was performed to study the effects of interfacial heat and mass transfer on the overall behavior of the launch system. The pressure of the combustion gas peaks at about 10 MPa, its temperature peaks at 2500K, and exit velocities of the multi-phase mixture exceed 100 m/s. The Volume-of-Fluid (VOF) method was used to compute volume fractions of the four individual species considered; namely atmospheric air, combustion gas, and water in both liquid and vapor phases. The evolution of the gas-liquid interface is presented at several time steps, as are several properties near the interface such as the temperature gradients and water volume fraction. Evaporation of water into the driving gas is shown to have a relatively small effect on the combustion reaction. Turbulent mixing at the gas-liquid interface, however, is shown to have significant effects on the structure of the liquid slug, especially upon its exit to the atmosphere. The behavior of the gas-liquid interface shows distinct similarities to the Rayleigh-Taylor instability observed in the experimental study of Nevmerzhitsky, et al [1].
KW - Computational fluid dynamics
KW - Dispersed flow
KW - Interface tracking
KW - Multiphase flow
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U2 - 10.1615/TFEC2018.cmd.021689
DO - 10.1615/TFEC2018.cmd.021689
M3 - Conference contribution
AN - SCOPUS:85090765347
T3 - Proceedings of the Thermal and Fluids Engineering Summer Conference
SP - 515
EP - 524
BT - Proceedings of the 3rd Thermal and Fluid Engineering Summer Conference, TFESC 2018
T2 - 3rd Thermal and Fluid Engineering Summer Conference, TFESC 2018
Y2 - 4 March 2018 through 7 March 2018
ER -