Air flows through the test section of a small wind tunnel at speed 0f 7.5 ft/s. The temperature of the air is 80 F , and the length of the wind tunnel test section is 1.5 ft. Assume that the boundary layer thickness is negligible prior to the start of the test section. Is the boundary layer along the test section wall laminar or turbulent or transitional?

Explanation:

Find the Reynolds number by using the equation,

…… (1)

Here,is density of air, V is velocity of wind, L is length of wind tunnel test section and is dynamic viscosity of air.

Obtain the properties of air at temperature from the table, from the table A.9, “Properties of air at Atmospheric Pressure”

At ,

Density,

Dynamic viscosity,

Substitute 7.5 ft/s for V and 1.5 ft for L in equation (1).

answer:

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