ねじれ形速度分布を有する放射状自由液膜流の乱流遷移に関する研究 : 第2報,乱流遷移

抄録

The transition from laminar to turbulent flow in a radial free liquid-film flow having three-dimensional velocity distributions is investigated experimentally. The flow was generated by releasing a thin liquid-film flow along a rotating disk into the atmosphere. The features of the liquid surface in the transition region were carefully observed using a stroboscope, and the velocity distribution in this region was measured by LDV. In the transition region, it was observed that new disturbance waves grew rapidly in the downstream direction, which were different in quality from that in the flow along the rotating disk. It was also found that weak three-dimensionality of the flow suppressed transition, whereas strong three-dimensionality promoted it. The results from the LDV measurement showed that the radial velocity component rapidly decreased to become uniform, owing to the transition.