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Effects of the Reynolds number
For Reynolds numbers lower than 1000 (based on the diameter of the orifice), corrections are required due to the presence of a completely viscous flow; Figure 2.11 shows the calibration curve for very low Reynolds numbers. For Reynolds numbers less than 50, the error increases rapidly and the curve tends to become
pOI _ p = 1 + 112
q Red
Such small values of the Reynolds number are typical of measurements made in the boundary layer, where speeds are low (down to zero) and
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Effects of low Reynolds numbers on the readings of a Pitot tube (d/D = 0.64)
Pitot tubes are very small to avoid both the displacement of the virtual centre in the presence of velocity gradients and the effects of proximity to the wall.
