🔍 Key Concepts

• Centrifugal force and specific gravity – how heavier water and solids move compared to lighter oil in a fast-spinning bowl • Role of the disk stack in a disk-type purifier – what happens to dirty oil as it passes between closely spaced disks • Where sludge and water normally collect or are discharged in a properly adjusted purifier bowl

💭 Think About

• Picture the rotating bowl: if oil, water, and solids are mixed, where will each layer tend to end up (inner, middle, or outer radius)? • Think about the purpose of the disks: do they mainly collect sludge, guide flow to improve separation, or throw only one phase outward? • Which statement best matches the idea that the purifier separates oil into distinct concentric layers rather than ejecting everything the same way?

✅ Before You Answer

• Verify which component in a disk-type purifier actually collects sludge versus which just improves separation surfaces • Check whether water and sludge normally exit with the clean oil, are both thrown outward together, or if their paths are different • Confirm that the clean oil layer is the lightest phase and consider whether it ends up closer to or farther from the spindle in the rotating bowl