低レイノルズ数の流れ場への水素気泡法の適用法に関する研究

概要

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A low limit of velocity easely applying the Hydorogen-bubble technique were well known about 0.05m/s. Recently the limit has been extended to about 0.005m/s. A purpose of this paper is to show one example of a technique for applying to lower velocity and lower Reynolds number. The Stokes's equation and the definition of Reynolds number denote that the relative velocity for the rising bubble to the flowing fluid with a high viscosity is very smaller than that of the water. Therefor we carried out an experiment by using the Hydorogen-bubble technique with glycerol aqueous solution. As an example the flow visualization for the further lower Reynolds number flow region, which could not approach by water were shown from experiments applying this solution to the radial flow between two parallel disks.
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