Abstract
The extreme blunting of velocity profiles for human blood, reported from doubleslit photometric measurements, has been shown to be an artifact of the measuring technique. The nature of the data distortion is an averaging over an area much larger than that predicted from analysis of the optics alone. A similar sensing and averaging of events from an area much larger than assumed may account for blunting of velocity profiles measured by other techniques such as laser-doppler. An empirical result showing a simple constant relationship between the volume flow rate and the double-slit centerline velocity makes the volume flow rate measurement by this technique simple and implies that the actual velocity profiles do not change significantly from a parabolic shape over a wide range of U hematocrit, and tube diameter.
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