CE321-WeirDesign - CE 321 INTRODUCTION TO FLUID MECHANICS...

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1 CE 321 INTRODUCTION TO FLUID MECHANICS Fall 2009 LABORATORY 5: CALIBRATION OF WEIRS PURPOSE To observe free-surface flow over a sharp–crested weir and to measure depth and discharge over the weir. OBJECTIVE To establish a depth-discharge relation for a V-notch weir. EQUIPMENT REQUIRED Hydraulic bench with V-notch weir, hook gage and stopwatch BACKGROUND Read sections 10.6.2 and 10.6.3 (pp. 397-401) in the text. The section describes weirs and their uses for flow measurements; in particular, the theoretical development of the sharp-crested weir. Beginning with the Bernoulli relation and subsequently accounting for non-ideal flow conditions, a correlation between discharge and a representative water depth Y can be derived for the V-notch weir: 2 5 2 tan 2 15 8 Y g C Q d = θ (1) Where: Q is the discharge or flow over the weir θ is the angle of the vee in the weir C d is the discharge coefficient for the given weir. Y is the height of the water measured from the bottom of the vee to the free
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This note was uploaded on 04/19/2010 for the course CE 321 taught by Professor Mantha,p during the Spring '08 term at Michigan State University.

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CE321-WeirDesign - CE 321 INTRODUCTION TO FLUID MECHANICS...

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