Opgave_21.pdf - Opgave 21[Strømning i rør Når en væske...

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Opgave 21. [Strømning i rør] Når en væske strømmer laminart (dvs. uden turbulens) gennem et cylinderformet rør, vil volumenstrømmen Q (målt i m 3 /s) afhænge af rørets radius R , væskens viskositet η (som måles i enheden Pa·s) og trykfaldet pr. meter af røret, p L . a) Bestem ved hjælp af dimensionsanalyse et udtryk for volumenstrømmen. a) Dimensionsmatricen opstilles: L 3 1 1 2 T 1 0 1 2 M 0 0 1 1 p Q R L η Enhederne for monomiet bliver 3 2 2 L T L L T M L T M 1 d a b c a a b c c c d d d p Q R L η
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  • Spring '19

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