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A fluid flowing over a flat plate has the following properties: dynamic viscosity = 25 × 10–6 kg/ ms, specific heat = 2.0 kJ/kgK, thermal conductivity 0.05 W/mK. The hydrodynamic boundary layer thickness is measured to be 0.5 mm. The thickness of the thermal boundary layer would be
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- 0.1 mm
- 0.5 mm
- 1.0 mm
- None of these
- 0.1 mm
Correct Option: B
| Pr = | ||
| K |
| = | = 1 | |
| 0.05 |
| ⇒ | = 1 | |
| δt |
Now , δ = 0.5 mm
∴ δ = δt = 0.5 mm
