乱流境界層に対する新解釈と其の応用 (第3報)
1956 年 1956 巻 90 号 p. 7-14
詳細
1956 年 1956 巻 90 号 p. 7-14
The author proposed a new vorticity transfer theory in the previous paper, and as an application the flow in circular pipe was calculated. The present paper is the second application of the theory for the flow along a flat plate.
Usually the velocity distribution along a plane wall is assumed to be similar to that in a circular pipe, but the author adopted here a different one as follows. “Form of shearing stress distribution is determined by the boundary conditions and is independent on the type of boundary layer, i. e. the laminar or the turbulent ones”.
The calculated results almost coincide with the formula by Prandtl, and moreover, the solution is flexibly adaptable for any condition of flows before the transition point, e.g. for an artificially stimulated flow in the model experiment. The thickness of laminar sublayer is obtained and this showes that the hydrodynamically smooth surface is influenced mainly by the velocity of plate and scarcely by Reynolds number.
