Heat and Mass Transfer in MHD Channels

Monitoring Magnetohydrodynamics Boundary Layers Using Emission Line Shape Features

“…The wall temperature found by tting to a power law pro le has an average value of 1855 111 K, and agrees well with a typically assumed value of 1800 K for slagcoated walls. 2 The average near-wall temperature found from the inverse power law was 1951 166 K. The near-wall temperature is a mathematical attempt to estimate the wall temperature by integrating the very steep thermal pro les over a small arbitrary amount (0.5 mm). Although a rough estimate could be made of the wall temperature from the inverse power law ts, it seems more satisfying to nd the wall temperature more directly by tting to the power law pro le.…”

“…1 Such experimental measurements provide information important for process analysis and accurate modeling of the heat transfer and electrical conduction. 2 With multiwavelength detection, the boundary-layer information is obtained from a spectrum representing a snapshot of the ow, and probability distribution functions can be developed from analysis of multiple spectra to reveal the uctuations in the ow. Although line shape tting can provide this information, the tting is too slow to be used as a commonplace diagnostic, and a study was undertaken to nd correlations between experimental line shape features and the ow parameters to nd a method for real-time monitoring of the turbulent boundary-layer ow.…”