You are working for SpaceX and are analyzing a proprietary tube bank preheat that thermally stabilizes rocket fuel prior to entering the rocket combustion engine. The tube bank is perfectly aligned such that the 25mm diameter tubes are spaced 50mm in both the transverse and longitudinal direction. Under normal operating conditions, a vent moves air in cross flow at a rate of

while the surface temperature of the tubes is maintained at 75 °C. There are 5 tube rows in the flow direction and 5 tubes per row totaling 25 tubes total. Determine the total heat transfer rate from the tube bank.

Determine the maximum velocity and corresponding Reynolds number for this problem: Umax = 50

Determine the Nusselt correlation for this problem and heat transfer coefficient: ( h=4∗103

Determine the temperature of air leaving the tube bank (To = 58.1)

Other things I could ask for are the log mean temperature, heat transfer rate…