Measurement techniques and problems:I. Dimension issues

Linear slide (travel 4.5”), gearing and dc motor

Streamlined strut, L=7”

Detachable plug

Viscous sublayer

Outer layer

Log-law region

2x10 5

3x10 8

Re x

6mm

48mm

4mm

14mm

60mm

18mm

d

6mm

6mm

Karman # (dut/n) 320 to 89x10 3

pitot probe
diameter ɬ.3mm

initial y+ 0.8 to 740

hot wire
diameter ɭ.2mm, l/d=200

initial y+ 1 to 940 (0.19mm)

step size 5mm
Dy+ 0.03 - 25

accuracy +/- 2.5mm
Dy+ 0.01 - 12

Change Rex from 2x10 5 to 3x10 8

d

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