Liquefied petroleum gas (LPG) (assumed to be pure propane, for simplicity) flows in an insulated horizontal tube at an inlet pressure of 7 bar. The tube diameter is 4 cm. The mass flux is 2.5 × 10 3...

Liquefied petroleum gas (LPG) (assumed to be pure propane, for simplicity) flows in an insulated horizontal tube at an inlet pressure of 7 bar. The tube diameter is 4 cm. The mass flux is 2.5 × 10³
kg/m²
·s. The tube has an 8 m long straight segment.

a. Find the total frictional pressure drop over the entire tube, using appropriate correlations of your own choice.

b. Find the total (frictional and gravitational) pressure drop if the tube is coiled into a vertically oriented helical configuration with R_cl
= 25 cm and l_pch
= 10 cm.