Strong wall modulations trigger early flow reversal, subcritical turbulence at Re 500-1000, and fully rough turbulent flow, with critical Re following a power-law in amplitude and hydraulic radius needed for friction laws.
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Laminar and Turbulent Flow in Wavy Pipes under Strong Wall Modulations
Strong wall modulations trigger early flow reversal, subcritical turbulence at Re 500-1000, and fully rough turbulent flow, with critical Re following a power-law in amplitude and hydraulic radius needed for friction laws.