b
Figure 11. Nusselt number and
friction coefficient at the downstream section of 1.2 ” elbow relative
to their values at x/D (fully redeveloped flow). (a) velocity = 1.2 m
s-1 (b) velocity = 5.2 m s-1.
Solution: 2300 ppm ETHOQUAD T13 + 2000 ppm NaSal in a molar ratio to
surfactant of 2.5:1. Source: [10].