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For flow of fluid over a heated plate, the following fluid properties are known: viscosity = 0.001 Pa.s; specific heat at constant pressure = 1 kJ/kgK; thermal conductivity = 1 W/mK. The hydrodynamic boundary layer thickness at a specified location on the plate is 1 mm. The thermal boundary layer thickness at the same location is
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- 0.001 mm
- 0.01 mm
- 1 mm
- 1000 mm
Correct Option: C
Given:
µ =0.001 Pa – s
CP = 1 kJ/kg K
Kf = 1W/mK (Fluid thermal conductivity)
Hydrodynamic boundary layer thickness, δ = 1 mm
| Pr = | = | = 1 | ||
| Kf | 1 |
δ t = δ (Cr)-1/3
= 1 × (1)-1/3 = 1 mm
