3.1.2. Velocity Streamline in Pipeline

e and formed a ε Figure 5 shows the distribution of streamlines in pipeline, where the color of the streamline indicates the velocity magnitude. From Figure 5a, the maximum flow velocity (41.01 m/s) and the minimum flow velocity (1.609 m/s) are concentrated in the elbow section. From Figure 5b, the location of maximum flow velocity and minimum flow velocity is close to the intrados surface. The velocity of gas increases and then decreases near the intrados surface, however, the velocity of the gas decreases and then increases near the extrados surface. From Figure 5b,c, the streamlines gradually were concentrated and many flow lines were terminated in the second straight section. Furthermore, most of streamlines are concentrated near the intrados surface and formed a ε-shape distribution. From Figure 5d, the streamlines near the extrados in elbow are constrained by the wall and diverged into the second straight section, and the middle streamlines has a relatively high velocity.

**Figure 5.** A three-dimensional diagram of fluid velocity distribution at different views (speed in color).
