Abstract
IN a paper published in 1884, Prof. Osborne Reynolds1 expressed the opinion that free surfaces, as found in open channels, tend to be “conducive to direct or steady motion”. Thus we should expect the critical Reynolds number for open channels to be, in general, higher than it is for pipes, using the hydraulic radius as the length-parameter throughout.
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ALLEN, J. Laminar and Turbulent Flow in Open Channels. Nature 208, 1196–1197 (1965). https://doi.org/10.1038/2081196a0
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DOI: https://doi.org/10.1038/2081196a0
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