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Problem of Osborne Reynolds and Numerical Analysis

Hidesada Kanda,
Professor, Information Systems and Technology Center

Conclusions and discussions:

(1) The transition must take place in the entrance region.

(2) The pressure at the wall is lower than that in the central core in the entrance region. Through Bernoulli's equation we know that a low velocity implies a high pressure and vice versa. However, in fact, Bernoulli's equation cannot be applied to the viscous entrance region and to boundary layers.

(3) The radial pressure gradient is not the force which accelerates the fluid particles in the central core.

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January 1996