Figure 14.
The graph presents three distinct curves indicating variations in function f as a response to the variable x-star, which ranges from zero point two to one on the horizontal axis. The vertical axis measures f, with values ranging from thirty to fifty. The three curves are represented with different styles: a dashed red line for eight modules, a dashed blue line for four modules, and a dashed black line for a non-finned annulus. Each curve is marked with star symbols at various points along the x-star axis. A legend in the upper right corner identifies the corresponding styles for each module configuration.Friction factor as a function of the dimensionless axial coordinate
Source: Authors’ own work