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Basic concept of flow - focus on microfluidic control technology
1. Fluid: A flowing gas, liquid, or multiphase flow (gas-solid-liquid, liquid-solid, gas-liquid-solid) is collectively referred to as a fluid. 2. Flow: refers to the amount of fluid flowing through a pipe or device in a cross-sectional area per unit of time. The flow rate is divided into instantaneous flow and cumulative flow according to different statistical time. Instantaneous flow refers to measurement in unit time, and cumulative flow refers to measurement within a certain period of time.