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A fluid (Prandt/number, Pr = 1) at 500 K flows over a flat plate of 1.5 m length, maintained at 300 K. The velocity of the fluid is 10 m/s. Assuming kinematic viscosity. μ = 30 × 10–6 m²/s, the thermal boundary layer thickness (in mm) at 0.5 m from the leading edge is ______.
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- m = 6.1237 mm
- m = 5.002 mm
- m = 7.135 mm
- m = 6.958mm
Correct Option: A
| Rex=0.5 = | = | = 166666.67 | ||
| 30 × 10-6 |
SinceRex=0.5 ≤ 5 × 105
Then flow will be laminar.
| ∴ δ = | = | = 6.1237 × 10-3 | ||
| √Rex | √166666.67 |
| = (pr)1/3 ⇒ δt = (1)1/3 × δ = 1 × 6.1237 × 10-3 m = 6.1237 mm | |
| K |
