Abstract
A strong correlation has been found between the center dip slope of self-reversed atomic potassium emission lines in a coal-e red magnetohydrodynamics e ow and the thickness of the cool boundary layer surrounding the hot core e ow. The boundary-layer proe le was determined indirectly from line shape e tting of simultaneous time-resolved multiwavelength emission and absorption spectra. For line shape e tting, a power law model with an effective boundary-layer width is proposed for modeling the radiative transfer across a turbulent boundary layer, rather than an inverse power law model that is used for a turbulent velocity boundary layer. A simple relationship can be written between the center dip slope and the effective boundary layer width that will allow real-time monitoring of the turbulent e ow.
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