Question

A flat plate has a length L = 1 m and experiences air flow parallel to the surface. Transition from laminar to turbulent flow occurs at xc = 0.5 m. The critical Reynolds number is Rex, c = 5 × 105. (a) If the film temperature is 350 K, what’s the air velocity? (b) The local convection coefficient for laminar flow is given by

Answer 1

velocity is 15.083 m/s

Step-by-step explanation:

given data

length L = 1 m

Laminar to turbulent flow

xc = 0.5 m

Reynolds number Rex, c = 5 ×
`10^(5)`

solution

we take here for 350 K

`\mu` = 1.81 ×
`10^(-5)`

and here Reynolds number Rex, is express as

Rex =
`(\sigma * v * x)/(\mu )` ................1

put here value at x = 0.5

5 ×
`10^(5)` =
`(1.2* v * 0.5)/(1.81* 10^(-5) )`

solve it we get

v = 15.083 m/s

so velocity is 15.083 m/s