On radial flow of a conducting gas in crossed fields

An earlier treatment of quasi-onedimensional flow of a conducting gas in crossed fields (Q.A.M., 19, 177 (1961)) is extended to radial flow with azimuthal magnetic field. The usual simplifying assumptions are made, including constant specific heats; and different flow situations are illustrated by means of phase diagrams (drawn for $\gamma = 1.33$). One of the differences between radial flow ($E$ = const.) and that in exponentially diverging channels ($E/B$ = const.) is the possibility of a smooth transition from supersonic to subsonic motion that seems to exist for a certain range of strongly divergent radial channels.