124 細孔を通る流体の流動特性に関する研究(S34-1 複雑流体の流れとその応用(1),S34 複雑流体の流れとその応用)  [in Japanese] 124 Study on The Flow Characteristics of The Fluid Passing Through Small Apertures  [in Japanese]

Reaction of jet issuing from small apertures has been measured by the jet-reaction method. We used one hole of 1.2mm and 0.5mm, porous membranes having numerous holes of 6.1μm, 4.9μm and 35μm, slots of 971μm, 131μm, 24μm and 18μm widths, and mesh screen composed of 49μm squares. Reynolds number ranges from 1 to 500. It is found that the jet of larger orifices and slots gives a reasonable agreement with the result of numerical analysis, but the jet from smaller size apertures gives the reaction lower than the data of the numerical analysis, especially zero for the 6.1μm hole. Some normal stress like the elastic stress of viscoelastic fluid is thought to be generated in micro-scale flows.