# Data Entry - Known Flow

With known flow elements we need to set all properties that define the fluid phase state and the flow direction. In practice this means the rows shown in the Input Editor in Figure 1: Figure 1: General Known Flow Input Requirements. Unique Name: Allows you to enter a descriptive name for this element. You can use this to describe the known flow element. It is not necessary to add any data to this field. If you do enter data here you can use this later to sort via the Lists. Status: For known flow elements there are 2 possible status values. On; Off. On is the normal position and tells the application that this node is open and to calculate the pressure into or out of the element. Off means that this component is closed to flow. You can close known flow elements to isolate part of a network. Elevation: This is the height above a selected datum. You can select any datum (base line with elevation = 0) that is convenient for you. When you construct any network you need to decide on a datum. This can typically be ground level, or the centerline of a pump. In flow calculations absolute elevations are not important, only the relative elevations of the nodes are important. The elevation that you enter in this row is the elevation of the known flow measured from the datum. Elevation Unit: The unit of length that defines the elevation that you have entered into the elevation row. Flow Direction: There are 2 possible values for this entry: Out of Network; Into Network. If Out of Network is selected this means that the only additional data required is the specified flow. For this option FluidFlow calculates the delivery pressure, temperature, phase state and fluid composition. If Into Network is selected then additional data is required. The additional data requirement is shown in Figure 2. Flow: This is the specified flow from or into the network. You can enter either a volumetric flow or mass flow. For gases, if you enter a volumetric flow, FluidFlow uses either volumetric flow referenced to STP or NTP conditions. This is determined by the settings you have in the Calculation Options. Flow Unit: This is the unit of flow used to specify the flow at this boundary. If Flow Direction is set to Into Network then additional rows appear as shown in Figure 2 Figure 2: Additional data requirements needed if Into Network is selected as the Flow Direction option. Temperature: This is the temperature of the fluid at the known flow boundary. Temperature Unit: Refers to the unit of temperature that is used to specify the temperature value. Fluid: You cannot add a value directly into this row by typing an entry. Instead when you focus on this row a button appears at the right edge. This allows you to select a value from the fluids database via the Select Fluid dialog. There are over 1200 fluids in the standard database. Fluid Type: This row may not appear in your version. It only appears if you have the Non-Newtonian/Slurry or Two-Phase module activated. The possible selections are: 1) Newtonian/NN-Non Settling, 2) Heterogeneous Settling, 3) Pulp/Paper Stock and 4) Two Phase. Selecting Newtonian/NN-Non Settling does not require any additional data entry concerning the fluid. You can make Non-Newtonian Non Settling calculations by selecting the appropriate fluid from the Select Fluid dialog. Selecting Heterogeneous Settling means that you can use a settling slurry as the fluid. If you make this selection then the rows as shown in Figure 3 appear: Figure 3: Additional data requirement for a Heterogeneous Settling Slurry. Flow Defined By: There are three possible values for this entry: 1) Total Slurry Flow 2) Solids Only 3) Carrier Only. 1) Total Slurry Flow: This indicates that the flow rate you have entered under the field titled "Flow" is the total system flow rate inclusive of particles and carrier fluid. 2) Solids Only: This indicates that the flow rate you have entered under the field titled "Flow" is the flow rate for the solids only, i.e., exclusive of carrier fluid. 3) Carrier Only: This indicates that the flow rate you have entered under the field titled "Flow" is the flow rate for the carrier fluid only, i.e., exclusive of solids. FluidFlow will automatically calculate the individual composition mass % and flow rate for the solids and carrier fluid for all three options noted above based on the defined solids concentration, etc. If you wish to view the flow rate of delivered solids for any of these options, select the boundary nodes which denote the various system outlets and view the results tab for each. Further information on this is available at: Boundaries | Known Flow | Results Table. Solids: You cannot add a value directly into this row by typing an entry. Instead when you focus on this row a button appears at the right edge. This allows you to select a solid from the solids database via the Select Solid dialog. Concentration Defined By: There are two possible values for this entry: Cw Weight %; Cv Volume %. This row works together with the Solids Concentration % row. If you select Cw Weight % then you can define the solids concentration of a slurry as a weight percent. If you select Cv Volume % then you can define the solids concentration of a slurry as a volume percent. The carrier fluid is defined in the Fluid row. Include Size Distribution: There are two possible states for this entry: Yes; No. If you select No then you will need to enter the d50 and d85 particle sizes. Note that these are the only two particle sizes that are used in the Durand or WASC (Wilson, Addie, Sellgren and Clift) correlations, so even if you enter particle size distribution data it will not be used unless you select the WASP calculation methods. Calculation methods are selected from the Calculation Options Dialog. d50: d50 is the mass mean particle diameter. This is the diameter at which 50% of the sample's mass is composed of smaller particles. d85: d85 is the particle diameter for which 85%, by mass, of the particles are finer. This is therefore the diameter at which 85% of the sample's mass is composed of smaller particles. d50/d85 Size Unit: This entry defines the unit of length used to define the particle size diameters. If you select Yes to Include Size Distribution, then the following rows appear as shown in Figure 4: Figure 4: Additional particle size data required for Include Size Distribution = Yes. % #xxMesh (.yyymm): For each entry, set the solid percent left on the sieve after a sieve analysis. #xx refers to the mesh size and .yyy represents the mesh size in mm. Selecting Two Phase for the row Fluid Type allows you to enter the initial Quality as shown in Figure 5. Figure 5: Additional data required for a Two Phase fluid. Quality (0..1): This is the vapor quality of the two phase mixture at the known flow boundary. Quality is the mass fraction of vapor in the two phase mix. 0 means that the phase state is liquid and 1 means that the phase state is vapor. This means your entry should be greater than 0 and less than 1. Selecting Pulp/Paper Stock for the row Fluid Type allows you to enter the Wt% Oven Dry Concentration as shown in Figure 6. Figure 6: Additional data required for a Pulp/Paper Stock. Wt% Oven Dry Concentration: This denotes the % composition of pulp/paper stock in the fluid with the remainder being made up of the carrier fluid. Note, the available pulp and paper calculation methods are only recommended for use in the 0.9 to 6 % (Moller) or 2 to 6 % (TAPPI) consistency range. If you wish to model a consistency value outside the noted range values, you may lose accuracy. User-Defined Fields: Allows you to add "fields" to the element, for use in, for example, scripting or reporting. Clicking on the input will display the User-Defined Fields dialog to add/edit/delete fields. Properties On Flowsheet: This value can either be: Show; or Hide. The Properties on Flowsheet row is available for all components. This means that you can decide what properties you wish to show on the flowsheet and for which components. If Show is selected then additional rows appear in the Input Editor, which allow you to set text font, color, size, text position and the properties you wish to display. The additional rows are shown in Figure 7: Figure 7: Additional input data required for showing properties on the flowsheet. Alignment: This row controls the alignment of the component properties on-screen. Possible values are: Top; Bottom; Left; or Right. Alignment of the displayed text is relative to the center of the component. Font: Text font properties can be set from the standard windows font dialog. Properties: Shows/hides Input and Result fields for display of properties on flowsheet. This allows for visibility of any input or calculated/result data to be controlled for each component. Individual property setting is made via the Select Element Properties dialog.