細管中の水の流れについて

概要

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毛細管の中を流れる水の速さを，毛細管の直径，毛細管の長さおよび毛細管にかかる水圧（水深）を変化させて，測定を行った。その結果，Reynolds数が約2000で水の流れの様子に変化が認められた。また水深一定のときの流速nuと，毛細管の長さlとの間には層流の場合はnu＝A／（l＋B），乱流の場合にはnu＝A′／（l＋B′）＋C′の式を，夫々満足することが確認された。更に，流速と毛細管の抵抗の間にも興味ある関係が見られた。The velocities of water flowing through horizontal capillaries with various lengths and diameters have been measured.The capillaries were attached to a tand and the depth of water in it was also changed variously while taking measurements.Itwas found that when the flow was laminar the velocity nu of flowing water and the length l of capillaries satisfied the equation nu=A(l+B),and when the flow was turbulent they satisfied the equation nu=A'(l+B')+C'at a fixed diameter,respectively.It was also found that when the Reynolds number was above about 2000 the flow of water was unstable and the resistance f of capillaries to flow was expressed by the equation f=knu+K and in the region of higher Reynolds number f was in proportion to the square of velocity.
大阪教育大学の論文
1984-12-31