When a fluid flows over a surface, the shear stress 1 (N/m) at the surface is given by the expression du dy surface where u is the viscosity (N-s/m), u is the velocity parallel to the surface (m/s), and y is the distance normal to the surface (cm). Measurements of the velocity of an air stream flowing above a surface are made with an LDV (laser-Doppler-Velocimeter). The values given below were obtained. u y и 0.0 0.00 2.0 88.89 1.0 55.56 3.0 100.00 At the local temperature, p = 0.00024 N-s/m. In four decimal places, calculate du/dy at the surface using all the points. Answer =

Elements Of Electromagnetics
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When a fluid flows over a surface, the shear stress I (N/m) at the surface is given by the expression
du
dy
surface
where p is the viscosity (N-s/m), u is the velocity parallel to the surface (m/s), and y is the distance normal to the surface (cm).
Measurements of the velocity of an air stream flowing above a surface are made with an LDV (laser-Doppler-Velocimeter). The values
given below were obtained.
y
y
0.0
0.00
2.0
88.89
1.0
55.56
3.0
100.00
2
At the local temperature, p = 0.00024 N-s/m. In four decimal places, calculate du/dy at the surface using all the points.
Answer =
Transcribed Image Text:When a fluid flows over a surface, the shear stress I (N/m) at the surface is given by the expression du dy surface where p is the viscosity (N-s/m), u is the velocity parallel to the surface (m/s), and y is the distance normal to the surface (cm). Measurements of the velocity of an air stream flowing above a surface are made with an LDV (laser-Doppler-Velocimeter). The values given below were obtained. y y 0.0 0.00 2.0 88.89 1.0 55.56 3.0 100.00 2 At the local temperature, p = 0.00024 N-s/m. In four decimal places, calculate du/dy at the surface using all the points. Answer =
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