Figure 13.
The vertical axis represents N subscript u values, ranging from approximately ten to forty-five. The horizontal axis represents x star values, ranging from zero point two to one, with increments of zero point two. Three distinct curves are shown on the graph: a dashed red line represents eight modules, a dashed blue line represents four modules, and a dashed black line represents a non-finned annulus. Each curve is marked with a corresponding symbol, and a legend within the graph identifies the meaning of each line style and symbol. All three curves show a general decrease in N subscript u as x star increases, with variations in trend across the three configurations.Nusselt number as a function of the dimensionless axial coordinate
Source: Authors’ own work