Why can’t the critical flow velocity be used to determine the flow pattern of a fluid?
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Is the following sentence correct? When two fluids flow at the same speed, one within a smooth pipe and the other within a rough pipe, laminar flow may occur in the smooth pipe, while turbulent flow may already exist in the rough pipe; it can be seen that the critical flow velocity cannot determine the flow pattern of the fluid
The flow regime is related to the Reynolds number, and the critical flow velocity applies to both gas phase and gas-liquid mixed phases.