Abstract
THE results recently reported by James and Morton1 disagree with results which I obtained in 1951 in research supported by the US Office of Naval Research. My work actually covered the effects of transverse and longitudinal vibrations on flow in circular tubes over a range of Reynolds numbers from 750 to a little more than 10,000, including the transition regime. I concluded that vibration had no effect on the friction factor except that at Reynolds numbers above about 2,200 flow which was laminar without vibration became turbulent with certain types of vibration. (Laminar flow was obtained to a Reynolds number of about 15,000 in the apparatus using a special head tank and water as fluid.)
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