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Consider incompressible laminar flow over a flat plate with freestream velocity of u∞. The Nusselt number corresponding to this flow velocity is Nu1. If the freestream velocity is doubled, the Nusselt number changes to Nu2. Choose the correct option for Nu2/Nu1.

1. √2
2. 2
3. 1.26
4. 1

Correct answer: √2

Solution

The Nusselt number is proportional to the square root of the Reynolds number for laminar flow over a flat plate. When the freestream velocity is doubled, the Reynolds number increases by a factor of 2, leading to a Nusselt number that is proportional to the square root of this increase, resulting in Nu2/Nu1 being √2.

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