TY - JOUR
T1 - Simulation of homogeneous ethanol condensation in nozzle flows using a kinetic method
AU - Gallagher-Rogers, Alison C.
AU - Zhong, Jiaqiang
AU - Levin, Deborah A.
N1 - Funding Information:
The research performed at the Pennsylvania State University was supported by the Air Force Office of Scientific Research grant F49620-02-1-0104, whose support is gratefully acknowledged. Special thanks also go to M. Ivanov of the Institute of Theoretical and Applied Mechanics, Russia, for the use of the original SMILE code.
PY - 2008
Y1 - 2008
N2 - When a liquid rocket engine operates in the space environment, droplets have been observed in the thruster plume that can cause contamination of spacecraft surfaces. Condensation can add to this contamination by contributing to the formation and growth of liquid particles in the flow. The condensation process has been modeled using the direct simulation Monte Carlo method. Models have been developed and incorporated into the direct simulation Monte Carlo code for the processes involved in condensation, which include nucleation, condensation, evaporation, coalescence, and nonsticking collisions. The models are applied to simulate the flow of ethanol in dry air, which has been used to model hydrazine in contamination studies in a vacuum chamber and has been used in several studies of condensation in a supersonic nozzle. Simulations are conducted of the internal flow in the divergent portion of a supersonic nozzle. The results show reasonable agreement with experimental data for the mass fraction of condensed ethanol along the nozzle axis, but the simulations give a lower value in all cases. The simulation results for the point of condensation onset show good agreement with the experimental data. The results are shown to be sensitive to the nucleation and evaporation rates, as well as the inclusion of the carrier gas.
AB - When a liquid rocket engine operates in the space environment, droplets have been observed in the thruster plume that can cause contamination of spacecraft surfaces. Condensation can add to this contamination by contributing to the formation and growth of liquid particles in the flow. The condensation process has been modeled using the direct simulation Monte Carlo method. Models have been developed and incorporated into the direct simulation Monte Carlo code for the processes involved in condensation, which include nucleation, condensation, evaporation, coalescence, and nonsticking collisions. The models are applied to simulate the flow of ethanol in dry air, which has been used to model hydrazine in contamination studies in a vacuum chamber and has been used in several studies of condensation in a supersonic nozzle. Simulations are conducted of the internal flow in the divergent portion of a supersonic nozzle. The results show reasonable agreement with experimental data for the mass fraction of condensed ethanol along the nozzle axis, but the simulations give a lower value in all cases. The simulation results for the point of condensation onset show good agreement with the experimental data. The results are shown to be sensitive to the nucleation and evaporation rates, as well as the inclusion of the carrier gas.
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U2 - 10.2514/1.34451
DO - 10.2514/1.34451
M3 - Article
AN - SCOPUS:56249126015
SN - 0887-8722
VL - 22
SP - 695
EP - 708
JO - Journal of thermophysics and heat transfer
JF - Journal of thermophysics and heat transfer
IS - 4
ER -