Abstract
A device is described which, while mounted flush with a wall bounding a streaming insulating fluid, can be used to deduce the velocity profile with respect to the coordinate normal to the wall. Ions, injected into the stream through a fine-meshed screen having a controlled potential V, migrate upstream along trajectories that sample the velocity profile. By means of finely divided electrodes that are also in the wall, the location, V, demarcating those ions that make it back to the upstream wall from those swept downstream is measured as a function of V. An algorithm is developed for deducing the velocity profile from the data ( V, Y). It is shown to be readily implemented with a microcomputer, which could oversee making the measurements.
Published Version
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