Anaes Vivas · Measurement & monitoring physics
Data viva — laminar vs turbulent flow
A Primary physics data viva — read a laminar-vs-turbulent flow diagram; describe the two flow types (profiles, mixing, pressure-flow relationship); give the Reynolds thresholds (< 2000 laminar, 4000 turbulent); explain the Poiseuille radius-to-the-fourth power (halve radius = 1/16 flow).
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A diagram shows two side-by-side labelled tube cross-sections: the left labelled LAMINAR FLOW with a parabolic (bullet-shaped) velocity profile of parallel arrows (longest at the centre, shortest near the walls, no mixing), and the right labelled TURBULENT FLOW with chaotic swirling arrows and circular eddies filling the tube (flat velocity profile, mixing). Below both is a highlighted Reynolds-number equation: Re = density times velocity times diameter divided by viscosity, with annotations: Re less than 2000 laminar, Re greater than 4000 turbulent. Describe the two flow types, give the Reynolds thresholds, and explain why halving the radius of a cannula reduces its flow by a factor of 16.
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