A Car Is Traveling At 65 Km Hr Its Bottom Surface Can Be Approximated As A 2 M Wide Door To Door 5 M Long Front To 1 (57.01 KiB) Viewed 29 times
A car is traveling at 65 km/hr. Its bottom surface can be approximated as a 2 m wide (door to door), 5 m long (front to back) rectangle at a temperature of 45°C and may be modeled as a flat plate. The ambient air is at 10°C. Assume the flow to be turbulent over the entire surface due to the agitation of the engine block with Reu=6x100. Air properties: k = 0.026 W/mK, Pr = 0.73. Other constants: 0=5.67x10-8 W/m2K4. Question 11 5 pts Determine the average Nusselt number associated with the flow conditions over the bottom surface of the car. Question 12 5 pts Determine the average convection coefficient (in W/m²K) associated with the flow conditions over the bottom surface of the car.
Question 13 10 pts Determine the rate of convective heat transfer (in kW) from the bottom surface of the car. Question 14 10 pts Determine the emissive power (in kW) coming from the bottom surface of the car if its emissivity is 0.85.
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