labora02

labora02 - The Hong Kong University of Science &...

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The Hong Kong University of Science & technology Department of Civil Engineering CIVL 252-Hydraulics TA: An Kyoung Jin Laboratory B: Laminar and Turbulent Flow 1. Objectives (A) To observe laminar, transitional and turbulent flow. (B) To determine the Reynolds numbers for the onset of transitional flow and onset of turbulent flow. 2. Background In a laminar flow fluid particles move in layers which pass smoothly over each other, in the direction of the flow. in steady-uniform-laminar pipe flow the path of a fluid particle can be seen by introducing a point source of dye. For steady flow the path of the particle represents a streamline. The streamline will appear as a solid line moving parallel to the pipe walls. Mixing occurs on a molecular scale and the dye streamline can be observed for the whole length of the pipe. In a turbulent flow the fluid particles move in haphazard and chaotic manner. The mean motion of the fluid particles is in the direction of the flow, but the actual paths taken by each particular vary greatly because of their interaction with the turbulent eddies. A point source of dye in a turbulent flow is quickly mixed into the fluid and
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This note was uploaded on 03/19/2012 for the course CIVL 000 taught by Professor Kk during the Spring '10 term at HKUST.

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labora02 - The Hong Kong University of Science &...

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