3. (10pts) A flat plate maintained at a temperature of 50°C experiences a flow o

Question

3. (10pts) A flat plate maintained at a temperature of 50°C experiences a flow of at- mospheric air at 15°C. If the temperature gradient at the plate's surface at a given downstream location is -43 °C/mm, what is the local heat transfer coefficient? . (1 0pts) Laboratory measurements of water flowing across a fat plate indicate a local shcar stress of 2.3 Pa. The free-stream velocity of the water is 5 m/s. If the free-stream and plate temperature are 15 C and 60°C, respectively, what is the local heat fux?

Explanation / Answer

Nusselt number,Nu = delta T/Temperature gradient

Nu = -35/-43 = 0.8139

Heat transfer coefficient can be calculated from Njsselt number,Nu =hd/k

For constant heat flux Nusselt no = 4.36

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