Component 141: Mixer with 3 inlets

Specifications

Line connections
1	Fluid inlet
2	Fluid outlet
3	1. Admixture
4	2. Admixture

General User Input Values Physics Used Displays Example

General

As a counterpart to Component 140, this component allows to mix three inlet flows to one outlet flow. It is an expansion of Component 60.

For each admixture, you can choose whether the mass flow is to be specified from outside or calculated via a specification value relative to the outlet mass flow.

The pressure can optionally be specified at the inlets or at the outlet:

When specifying at the inlets (FSPECP=100), the outlet pressure is the smallest of all inlet pressures.
When specifying at the outlet (FSPECP=200), all inlet pressures are equated with the outlet pressure.

The enthalpy must be given on three random pins. The enthalpy of the fourth line is then calculated from the energy balance. Here it is better for the convergence to specify the enthalpies on lines with small mass flows and have them calculated on the line with a great mass flow.

Like Component 60, also Component 141 can be used for shafts and electric lines in order to model a mixing of mechanical energy and electrical output respectively.

Please note: In this mixer, however, rotational speed and frequency respectively, voltage and phase are just transferred from the main inlet (Pin 1) to the outlet. The values of the auxiliary inlets are ignored.

To keep the component clearly arranged, not all specification options that would result from a combination of two Components 60 have been implemented. If a case is required that cannot be covered with Component 141, it will have to be represented with two Components 60.

User Input Values

FMODE	Flag for calculation mode design/off-design Like in Parent Profile (Sub Profile option only) Expression = 0: GLOBAL = 1: local off-design (i.e. always off-design mode, even when a design calculation has been done globally) = -1: local design
FM3	Specification first mixing stream M3 Like in Parent Profile (Sub Profile option only) Expression =0: Flow 3 calculated from specification value M3M2 =1: Flow 3 given from outside
M3M2	First mixing mass flow M3 relative to M2
FM4	Specification second mixing stream M4 Like in Parent Profile (Sub Profile option only) Expression =0: Flow 4 calculated from specification value M4M2 =1: Flow 4 given from outside
M4M2	Second mixing mass flow M4 relative to M2
FSPECP	Flag for pressure handling Like in Parent Profile (Sub Profile option only) Expression = 100: if P1<P3 und P1<P4 P2=P1 if P3<P1 und P3<P4 P2=P3 if P4<P1 und P4<P3 P2=P4 = 20: P2=P4=P3=P1

Generally, all inputs that are visible are required. But, often default values are provided.

For more information on colour of the input fields and their descriptions see Edit Component\Specification values

For more information on design vs. off-design and nominal values see General\Accept Nominal values

Physics Used

Equations

for material lines
	M2 – M1 – M3 – M4 = 0 (1) if FM3=0: M3 – M3M2 * M2 = 0 (2) if FM4=0: M4 – M4M2 * M2 = 0 (3) if FSPECP= 100: if P1<P3 und P1<P4: c1=1, c3=c4=0 if P3<P1 und P3<P4: c1=c4=0, c3=1 if P4<P1 und P4<P3: c1=c3=0, c4=1 P2 – c1P1 – c3P3 – c4P4 = 0 (4) if FSPECP= 20: P2 – P1 = 0 (5) P3 – P2 = 0 (6) P4 – P2 = 0 (7) M2 H2 - M1 * H1 - M3 * H3 – M4 * H4 = 0 (8)
for mechanical shafts and electric lines
	M2 – M1 = 0 (1) P2 – P1 = 0 (2) H2 – H1 – H3 – H4 = 0 (3) if FM3=0: H3 – M3M2 * H2 = 0 (4) if FM4=0: H4 – M4M2 * H2 = 0 (5)

Component Displays

Display Option 1

Display Option 2

Example

Click here >> Component 141 Demo << to load an example.

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