3. A copper sphere is immersed in an airflow where free stream temperature is 27 °C and the heat transfer coefficient be

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3 A Copper Sphere Is Immersed In An Airflow Where Free Stream Temperature Is 27 C And The Heat Transfer Coefficient Be 1 (28.66 KiB) Viewed 21 times

3. A copper sphere is immersed in an airflow where free stream temperature is 27 °C and the heat transfer coefficient between sphere and stream is 35 W/m²K. Find the diameter of the copper sphere if sphere temperatures are measured to be 66 °C at initial condition and 55 °C at 70 seconds later. The density, specific heat and thermal conductivity values for copper can be taken as 8933 kg/m³, 389 J/kg and 398 W/mK respectively. Validate the lumped capacitance assumption.