# Auto-Sizing an Inline Nozzle

From v3.31 onwards, FluidFlow includes a powerful Auto-Size feature which allows engineers to automatically size a range of elements including inline nozzles. This series of examples demonstrates how inline nozzles can be automatically sized using either a design flow rate or design pressure loss. To begin, a standard inline nozzle with a throat diameter of 10mm has been modeled in a 10.0 M long 2 inch Schedule 40 steel pipeline. This allows us to establish the flow rate and pressure loss for this size of element in this system. We can then benchmark our automatically sized element against this base model. Figure 1 shows the data entry for the nozzle and Figure 2 gives an overview of the performance of this device in this system. Figure 1: Data entry for Inline Nozzle (Auto Size function set to Off). Figure 2: 10mm Inline Nozzle Model (Auto Size function set to Off). We can see in Figure 2 that the mass flow rate in the system has been calculated as 0.72228 kg/s based on a nozzle throat diameter of 10mm. Auto-Sizing based on Design Flow Rate. Set the Automatically Size field for the nozzle to "On", set the Sizing Model to Size for Flow and enter the design flow rate of 0.72228 kg/s for the nozzle (flow rate calculated in Figure 2). Note, the field titled Throat Diameter has now been removed from the Input Editor as FluidFlow will now automatically calculate the size required based on the design flow condition entered by the user. The Input Editor for the nozzle should now appear as shown in Figure 3. Figure 3: Data entry for Auto-Sizing an Inline Nozzle (Sized based on design flow rate established in Figure 2). Figure 4 shows the calculated results for the nozzle. As we can see, FluidFlow has established a required throat diameter of 10mm based on the design flow rate of 0.72228 kg/s, i.e., matching Figure 2. Figure 4: Auto-Sizing an Inline Nozzle (Sized based on design flow rate established in Figure 2). Auto-Sizing based on Design Pressure Loss. Set the Automatically Size field for the nozzle to "On", set the Sizing Model to Size for Pressure Loss and enter the design pressure loss of 50353.98 Pa for the nozzle (pressure loss calculated in Figure 2). The Input Editor for the nozzle should now appear as shown in Figure 5. Figure 5: Data entry for Auto-Sizing an Inline Nozzle (Sized based on design pressure loss established in Figure 2). Figure 6 shows the calculated results for the nozzle based on a design pressure loss of 50353.98 Pa across the element. As we can see, FluidFlow has established a required throat diameter of 10mm, matching the results as shown in Figure 2. The element has therefore been automatically sized successfully. Figure 6: Auto-Sizing an Inline Nozzle (Sized based on design pressure loss established in Figure 2). For further information, a detailed example of automatically sizing components is available at: Design Examples | Auto Equipment Sizing.