When water recirculates within the pump impeller and casing, this is referred to as what?

When water recirculates within the pump impeller and casing, this phenomenon is referred to as slip. In the context of pumps, slip occurs due to the difference between the actual flow of water being pumped and the theoretical flow, which can be influenced by various factors such as internal recirculation and inefficiencies.

Understanding slip is important for evaluating the performance of a pump. It can indicate issues like wear in the pump components or improper pump operation. In contrast, the terms backflow, leakage, and bypass refer to specific conditions that do not directly describe the internal recirculation of fluid within a pump. Backflow generally denotes water moving in the opposite direction of intended flow, leakage refers to unintended water loss from the system, and bypass indicates a pathway that diverts water around the main flow route, but none specifically address the recirculation phenomenon within the impeller and casing as slip does.