Verification Case 41
PRODUCT: AFT Fathom
TITLE: FthVerify41.fth
REFERENCE: Robert W. Fox and Alan T. McDonald, Introduction to Fluid Mechanics, 3rd Ed., 1985, John Wiley & Sons, Page 385-389, example 8.11
FLUID: Water at 60 deg. F
ASSUMPTIONS: N/A
RESULTS:
| Parameter | Fox & McDonald | AFT Fathom |
| Flow rate to Branch 1 (gal/min) | 493 | 493.48 |
| Flow rate to Branch 2 (gal/min) | 557 | 557.44 |
| Flow rate to Branch 3 (gal/min) | 449 | 449.09 |
| Pressure at inlet (psig) | 91.2 | 91.52 |
DISCUSSION:
Fox and McDonald use equivalent lengths to model the elbows. These were converted to K factors of 0.4 in AFT Fathom. The loss factors at the three sprays (modeled as assigned pressure junctions) were specified as 16. This allows for the area ratio of 2 to the 4th power to account for the energy lost at the discharge.
Note this model uses fluid properties from the AFT Standard fluid library. The AFT Standard fluid library was updated in AFT Fathom 12, thus the AFT Fathom results will be slightly different for this verification case when compared to previous versions of AFT Fathom.
