If Nusselt number is 390, Reynolds number is 39 and Prandtl number is 20, then Stanton number will be

This question was previously asked in

UPPSC AE Mechanical 2013 Official Paper II

- 780
- 200
- 2
- 0.5

Option 4 : 0.5

**Concept:**

The Stanton number, St, is a dimensionless number that measures the ratio of heat transferred into a fluid to the thermal capacity of fluid.

**Calculation:**

\(St = \frac{h}{{\rho u{c_p}}} = \frac{{Nu}}{{Re.Pr}} = \frac{{390}}{{39 \times 20}} =0. 5\)

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