Saturated liquid propane flows in a circular stainless steel tube at a mass flow rate of 46 g/s. The liquid propane ente

[answerhappygod]

Saturated liquid propane flows in a circular stainless steel
tube at a mass flow rate of 46 g/s. The liquid propane enters the
tube at −50°C, and the tube surface is maintained isothermal. The
tube has an inner diameter of 25 mm, and its length is 3 m. The
inner surface of the tube has a relative surface roughness of 0.05.
The code for process piping limits the minimum temperature suitable
for using the stainless steel tube at −30°C. To keep the tube
surface from getting too cold, the tube is heated at a rate of 1.75
kW. Determine the surface temperature of the tube. Is the stainless
steel tube suitable under these conditions? Please comment.
Evaluate the fluid properties at −40°C. Is this an appropriate
temperature at which to evaluate the fluid properties?