A model for line absorption and emission from turbulent mixing layers
نویسندگان
چکیده
ABSTRACT Turbulent mixing layers (TMLs) are ubiquitous in multiphase gas. They can potentially explain observations of high ions such as O vi, which have significant observed column densities despite short cooling times. Previously, we showed that global mass, momentum, and energy transfer between phases mediated by TMLs is not sensitive to details thermal conduction or numerical resolution. By contrast, show here observables temperature distributions, densities, line ratios considerations. We the reason for this difference. develop a prescription applying simple 1D conductive-cooling front model quantitatively reproduces 3D hydrodynamic simulation results ratios, even when TML has complex fractal structure. This enables subgrid absorption emission predictions large scale simulations. The predicted good agreement with observations, while require numerous be pierced along sight.
منابع مشابه
Buoyant turbulent mixing in shear layers
Buoyancy effects in unstably stratified mixing layers express themselves through gravity currents of heavy fluid which propagate in an ambient lighter fluid. These currents are encountered in numerous geophysical flows, industrial safety and environmental protection issues [1] . During transition to turbulence a strong distortion of the separating interface between regions containing ‘heavy’ or...
متن کاملLine-of-sight Statistical Methods for Turbulent Medium: Vcs for Emission and Absorption Lines
We present an overview of the Velocity Coordinate Spectrum (VCS), a new technique for studying astrophysical turbulence that utilizes the line-of-sight statistics of Doppler-broadened spectral lines. We consider the retrieval of turbulence spectra from emission intensity observations of both high and low spatial resolution and find that the VCS allows one to study turbulence even when the emitt...
متن کاملTurbulent Mixing in Oceanic Surface and Benthic Boundary Layers
The objectives of the specific effort being reported are to improve the fundamental knowledge of turbulent mixing and diffusion processes occurring in oceanic boundary layers, with special emphases on the surface mixed layer and the wave-current boundary layer in coastal oceans. In the studies of surface mixed layers, the focus is on the penetration of a mixed layer (say, driven by the wind) in...
متن کاملOn density effects and large structure in turbulent mixing layers
Plane turbulent mixing between two streams of different gases (especially nitrogen and helium) was studied in a novel apparatus. Spark shadow pictures showed that, for all ratios of densities in the two streams, the mixing layer is dominated by large coherent structures. High-speed movies showed that these convect at nearly constant speed, and increase their size and spacing discontinuously by ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society: Letters
سال: 2021
ISSN: ['1745-3925', '1745-3933']
DOI: https://doi.org/10.1093/mnrasl/slab100