可視化情報学会誌
Online ISSN : 1884-037X
Print ISSN : 0916-4731
ISSN-L : 0916-4731
A102 管内加速流れの遷移実験
下村 悟司山川 泰弘西原 一嘉近江 宗一
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1999 年 19 巻 Supplement2 号 p. 13-16

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Usually, steady pipe flow is luminar Reynolds number Reis less than 2320, and turbulent when Reis more than 3000. However transition Reynolds number in the acceleration pipe flow is much bigger than that of steady flow, where the transition is only judged by the velocity fluctuation.
Transition to turbulent in acceleration flow has not been proved by flow visualization.
In this paper flow visualization was conducted to prove the transition in accelaration pipe flow.
The relation between acceleration and transition Reynolds number was almost the same as that by Lefebvre.

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