Question

Water at 20°C is flowing over a 2 m long flat plate at a velocity of 0.2 m/s. Determine the thermal boundary layer thickness at the end of the plate (v=1.004 x 10^-6m^2/s, Pr=7.01) a. 8.13 mm b. 10.97 mm c. 14.88 mm d. 17.21 mm

Answer 1

option is C

Step-by-step explanation:

we know that reynold number is given
`Re = (vD)/(\\u)`

`Re = (0.2*2)/(1.004*10^(-6)) = 398406.37` WHICH IS LESS THAN

5*10^5

therefore flow is laminar

velocity distribution is parabolic

`\delta = (4.64x)/(\sqrt Re_x)`

`\delta = \frac{4.64*2000}{\sqrt {398406.37}} = 14.7 mm`

nearest option is C