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Turbulence in supercritical o2/h2 and c7h16/n2 mixing layers
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Okong'o, Nora Harstad, Kenneth Bellan, Josette |
| Copyright Year | 2003 |
| Description | This report presents a study of numerical simulations of mixing layers developing between opposing flows of paired fluids under supercritical conditions, the purpose of the study being to elucidate chemical-species-specific aspects of turbulence. The simulations were performed for two different fluid pairs O2/H2 and C7H16/N2 at similar reduced initial pressures (reduced pressure is defined as pressure divided by critical pressure). Thermodynamically, O2/H2 behaves more nearly like an ideal mixture and has greater solubility, relative to C7H16/N2, which departs strongly from ideality. Because of a specified smaller initial density stratification, the C7H16/N2 layers exhibited greater levels of growth, global molecular mixing, and turbulence. However, smaller density gradients at the transitional state for the O2/H2 system were interpreted as indicating that locally, this system exhibits enhanced mixing as a consequence of its greater solubility and closer approach to ideality. These thermodynamic features were shown to affect entropy dissipation, which was found to be larger for O2/H2 and concentrated in high-density-gradient-magnitude regions that are distortions of the initial density-stratification boundary. In C7H16/N2, the regions of largest dissipation were found to lie in high-density-gradient-magnitude regions that result from mixing of the two fluids. |
| File Size | 432834 |
| Page Count | 1 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20110023790 |
| Archival Resource Key | ark:/13960/t8nd0x63b |
| Language | English |
| Publisher Date | 2003-04-01 |
| Access Restriction | Open |
| Subject Keyword | Man/system Technology And Life Support Thermodynamics Critical Pressure Oxygen Supercritical Fluids Turbulence Simulation Hydrogen Entropy Nitrogen Stratification Mixing Layers Fluids Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
