The length of the surface for which the flow remains laminar is 1.36m.
When a particle of liquid is followed by the another particle and the flow is smooth, is called the laminar flow.
Given is the Air at 20 °c flows over a 4-m long and 3-m wide surface of a plate whose temperature is 80 °c with a velocity V of 5 m/s.
Final temperature = 20 +80/2 =50°
The kinematic viscosity ν =1.798 x 10⁻⁵ m²/s
The Reynold's number Re =5 x 10⁵
The Reynold's number is given by
Re =Vx/ν where x is the length of surface
Substitute the value into the expression above,
5 x 10⁵ = 5x /1.798 x 10⁻⁵
x =1.36m
Thus, the length of the surface for which the flow remains laminar is 1.36m.
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