Thermal oil pocket mixing model
| Symbol | - |
|---|---|
| Unit | - |
| Attribute-ID | thermal_oil_mixing_model |
| Numeric ID | 9331 |
| Value Type | PMString |
The thermal pocket mixing model is used to determine the effective feed temperature TT,i of the fed lubricant QT,i.
The three-dimensional lubricant quantities supplied or discharged in the segment gaps or hydrostatic pockets are adjusted according to the two-dimensional volume flow balance.
| QT,i | Zu- bzw. abgeführte Schmierstoffmenge |
| QTs,1 | Seitenfluss über den vorderen Lagerrand |
| QTs,2 | Seitenfluss über den hinteren Lagerrand |
| QE,i-1 | Fluss aus dem Segment i-1 |
| QA,i | Fluss indem Segment i |
The fresh oil of a pocket is mixed with the lubricant entering from the previous segment in a flow tube and fed to the following segment. The flow tube represents the control room in which the relevant processes take place and which is represented by the grid. For numerical conversion, the segment initial volume flow profile is projected in circumferential direction over the pocket area. The difference between the volume flow at the end of the segment and the volume flow at the beginning of of the segment corresponds exactly to the lubricant quantity supplied or discharged.
The following thermal oil pocket mixing models are available:
The effective lubricant supply temperature TT,i of the lubricant flowing into the flow tube deviates from the nominal supply temperature T0 due to heat transfer to the reservoir. The effective lubricant supply temperature can be calculated from the balance of the conductive heat transfers
The heat transfer to the lubricant present in the pocket/ segment gap area is neglected and the idealized boundary condition is assumed that the effective feed temperature TT,i with positive oil flow in the respective pocket or segment gap is equal to the nominal feed temperature T0.