In: Mechanical Engineering
Water at 15°C enters a tube of 2 cm of diameter with flow rate 3953 kg/h. Assume the ratio L/D >10, and the wall temperature is constant at 80◦C. The outlet temperature is 50°C The properties of water at the film temperature are density rho = ? = 985 ?/?3, specific heat ?p = 4180 ?/?, conductivity ? = 0.651 ?/?, dynamic viscosity mu= ?? = 4.71 × 10−4 ?/?, At the wall temperature of 80°C we have dynamic viscosity muw= ?? = 3.55 × 10−4?/?
1. Calculate the average velocity, ?
2. Calculate Reynolds number ?e?
3. Determine the flow regime
4. Calculate Prandtl number ?r
5. Calculate the rate of heat transfer, ?
6. Calculate the mean temperature ??
7. Calculate Nusselt number ?u?
8. Calculate convection heat transfer coefficient ℎ
9. Calculate the length of the tube ?
10. Calculate the ratio ?/D